369a6a6ed4
This option can force the segmenter to only start a new segment if a packet reaches the muxer within the specified duration after the segmenting clock time, which makes it more resilient to backward local time jumps, such as leap seconds or transition to standard time from daylight savings time. Reviewed-by: Stefano Sabatini <stefasab@gmail.com> Signed-off-by: Marton Balint <cus@passwd.hu>
1465 lines
50 KiB
Plaintext
1465 lines
50 KiB
Plaintext
@chapter Muxers
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@c man begin MUXERS
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Muxers are configured elements in FFmpeg which allow writing
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multimedia streams to a particular type of file.
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When you configure your FFmpeg build, all the supported muxers
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are enabled by default. You can list all available muxers using the
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configure option @code{--list-muxers}.
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You can disable all the muxers with the configure option
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@code{--disable-muxers} and selectively enable / disable single muxers
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with the options @code{--enable-muxer=@var{MUXER}} /
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@code{--disable-muxer=@var{MUXER}}.
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The option @code{-formats} of the ff* tools will display the list of
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enabled muxers.
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A description of some of the currently available muxers follows.
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@anchor{aiff}
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@section aiff
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Audio Interchange File Format muxer.
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@subsection Options
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It accepts the following options:
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@table @option
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@item write_id3v2
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Enable ID3v2 tags writing when set to 1. Default is 0 (disabled).
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@item id3v2_version
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Select ID3v2 version to write. Currently only version 3 and 4 (aka.
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ID3v2.3 and ID3v2.4) are supported. The default is version 4.
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@end table
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@anchor{chromaprint}
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@section chromaprint
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Chromaprint fingerprinter
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This muxer feeds audio data to the Chromaprint library, which generates
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a fingerprint for the provided audio data. It takes a single signed
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native-endian 16-bit raw audio stream.
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@subsection Options
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@table @option
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@item silence_threshold
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Threshold for detecting silence, ranges from 0 to 32767. -1 for default
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(required for use with the AcoustID service).
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@item algorithm
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Algorithm index to fingerprint with.
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@item fp_format
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Format to output the fingerprint as. Accepts the following options:
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@table @samp
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@item raw
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Binary raw fingerprint
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@item compressed
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Binary compressed fingerprint
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@item base64
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Base64 compressed fingerprint
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@end table
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@end table
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@anchor{crc}
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@section crc
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CRC (Cyclic Redundancy Check) testing format.
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This muxer computes and prints the Adler-32 CRC of all the input audio
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and video frames. By default audio frames are converted to signed
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16-bit raw audio and video frames to raw video before computing the
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CRC.
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The output of the muxer consists of a single line of the form:
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CRC=0x@var{CRC}, where @var{CRC} is a hexadecimal number 0-padded to
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8 digits containing the CRC for all the decoded input frames.
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See also the @ref{framecrc} muxer.
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@subsection Examples
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For example to compute the CRC of the input, and store it in the file
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@file{out.crc}:
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@example
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ffmpeg -i INPUT -f crc out.crc
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@end example
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You can print the CRC to stdout with the command:
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@example
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ffmpeg -i INPUT -f crc -
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@end example
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You can select the output format of each frame with @command{ffmpeg} by
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specifying the audio and video codec and format. For example to
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compute the CRC of the input audio converted to PCM unsigned 8-bit
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and the input video converted to MPEG-2 video, use the command:
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@example
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ffmpeg -i INPUT -c:a pcm_u8 -c:v mpeg2video -f crc -
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@end example
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@anchor{framecrc}
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@section framecrc
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Per-packet CRC (Cyclic Redundancy Check) testing format.
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This muxer computes and prints the Adler-32 CRC for each audio
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and video packet. By default audio frames are converted to signed
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16-bit raw audio and video frames to raw video before computing the
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CRC.
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The output of the muxer consists of a line for each audio and video
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packet of the form:
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@example
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@var{stream_index}, @var{packet_dts}, @var{packet_pts}, @var{packet_duration}, @var{packet_size}, 0x@var{CRC}
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@end example
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@var{CRC} is a hexadecimal number 0-padded to 8 digits containing the
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CRC of the packet.
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@subsection Examples
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For example to compute the CRC of the audio and video frames in
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@file{INPUT}, converted to raw audio and video packets, and store it
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in the file @file{out.crc}:
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@example
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ffmpeg -i INPUT -f framecrc out.crc
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@end example
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To print the information to stdout, use the command:
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@example
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ffmpeg -i INPUT -f framecrc -
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@end example
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With @command{ffmpeg}, you can select the output format to which the
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audio and video frames are encoded before computing the CRC for each
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packet by specifying the audio and video codec. For example, to
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compute the CRC of each decoded input audio frame converted to PCM
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unsigned 8-bit and of each decoded input video frame converted to
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MPEG-2 video, use the command:
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@example
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ffmpeg -i INPUT -c:a pcm_u8 -c:v mpeg2video -f framecrc -
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@end example
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See also the @ref{crc} muxer.
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@anchor{framemd5}
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@section framemd5
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Per-packet MD5 testing format.
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This muxer computes and prints the MD5 hash for each audio
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and video packet. By default audio frames are converted to signed
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16-bit raw audio and video frames to raw video before computing the
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hash.
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The output of the muxer consists of a line for each audio and video
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packet of the form:
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@example
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@var{stream_index}, @var{packet_dts}, @var{packet_pts}, @var{packet_duration}, @var{packet_size}, @var{MD5}
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@end example
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@var{MD5} is a hexadecimal number representing the computed MD5 hash
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for the packet.
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@subsection Examples
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For example to compute the MD5 of the audio and video frames in
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@file{INPUT}, converted to raw audio and video packets, and store it
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in the file @file{out.md5}:
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@example
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ffmpeg -i INPUT -f framemd5 out.md5
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@end example
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To print the information to stdout, use the command:
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@example
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ffmpeg -i INPUT -f framemd5 -
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@end example
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See also the @ref{md5} muxer.
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@anchor{gif}
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@section gif
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Animated GIF muxer.
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It accepts the following options:
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@table @option
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@item loop
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Set the number of times to loop the output. Use @code{-1} for no loop, @code{0}
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for looping indefinitely (default).
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@item final_delay
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Force the delay (expressed in centiseconds) after the last frame. Each frame
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ends with a delay until the next frame. The default is @code{-1}, which is a
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special value to tell the muxer to re-use the previous delay. In case of a
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loop, you might want to customize this value to mark a pause for instance.
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@end table
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For example, to encode a gif looping 10 times, with a 5 seconds delay between
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the loops:
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@example
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ffmpeg -i INPUT -loop 10 -final_delay 500 out.gif
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@end example
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Note 1: if you wish to extract the frames in separate GIF files, you need to
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force the @ref{image2} muxer:
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@example
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ffmpeg -i INPUT -c:v gif -f image2 "out%d.gif"
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@end example
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Note 2: the GIF format has a very small time base: the delay between two frames
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can not be smaller than one centi second.
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@anchor{hls}
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@section hls
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Apple HTTP Live Streaming muxer that segments MPEG-TS according to
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the HTTP Live Streaming (HLS) specification.
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It creates a playlist file, and one or more segment files. The output filename
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specifies the playlist filename.
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By default, the muxer creates a file for each segment produced. These files
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have the same name as the playlist, followed by a sequential number and a
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.ts extension.
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For example, to convert an input file with @command{ffmpeg}:
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@example
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ffmpeg -i in.nut out.m3u8
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@end example
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This example will produce the playlist, @file{out.m3u8}, and segment files:
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@file{out0.ts}, @file{out1.ts}, @file{out2.ts}, etc.
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See also the @ref{segment} muxer, which provides a more generic and
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flexible implementation of a segmenter, and can be used to perform HLS
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segmentation.
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@subsection Options
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This muxer supports the following options:
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@table @option
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@item hls_time @var{seconds}
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Set the segment length in seconds. Default value is 2.
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@item hls_list_size @var{size}
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Set the maximum number of playlist entries. If set to 0 the list file
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will contain all the segments. Default value is 5.
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@item hls_ts_options @var{options_list}
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Set output format options using a :-separated list of key=value
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parameters. Values containing @code{:} special characters must be
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escaped.
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@item hls_wrap @var{wrap}
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Set the number after which the segment filename number (the number
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specified in each segment file) wraps. If set to 0 the number will be
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never wrapped. Default value is 0.
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This option is useful to avoid to fill the disk with many segment
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files, and limits the maximum number of segment files written to disk
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to @var{wrap}.
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@item start_number @var{number}
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Start the playlist sequence number from @var{number}. Default value is
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0.
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@item hls_allow_cache @var{allowcache}
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Explicitly set whether the client MAY (1) or MUST NOT (0) cache media segments.
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@item hls_base_url @var{baseurl}
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Append @var{baseurl} to every entry in the playlist.
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Useful to generate playlists with absolute paths.
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Note that the playlist sequence number must be unique for each segment
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and it is not to be confused with the segment filename sequence number
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which can be cyclic, for example if the @option{wrap} option is
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specified.
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@item hls_segment_filename @var{filename}
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Set the segment filename. Unless hls_flags single_file is set @var{filename}
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is used as a string format with the segment number:
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@example
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ffmpeg in.nut -hls_segment_filename 'file%03d.ts' out.m3u8
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@end example
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This example will produce the playlist, @file{out.m3u8}, and segment files:
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@file{file000.ts}, @file{file001.ts}, @file{file002.ts}, etc.
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@item hls_key_info_file @var{key_info_file}
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Use the information in @var{key_info_file} for segment encryption. The first
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line of @var{key_info_file} specifies the key URI written to the playlist. The
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key URL is used to access the encryption key during playback. The second line
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specifies the path to the key file used to obtain the key during the encryption
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process. The key file is read as a single packed array of 16 octets in binary
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format. The optional third line specifies the initialization vector (IV) as a
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hexadecimal string to be used instead of the segment sequence number (default)
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for encryption. Changes to @var{key_info_file} will result in segment
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encryption with the new key/IV and an entry in the playlist for the new key
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URI/IV.
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Key info file format:
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@example
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@var{key URI}
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@var{key file path}
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@var{IV} (optional)
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@end example
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Example key URIs:
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@example
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http://server/file.key
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/path/to/file.key
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file.key
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@end example
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Example key file paths:
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@example
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file.key
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/path/to/file.key
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@end example
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Example IV:
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@example
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0123456789ABCDEF0123456789ABCDEF
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@end example
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Key info file example:
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@example
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http://server/file.key
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/path/to/file.key
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0123456789ABCDEF0123456789ABCDEF
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@end example
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Example shell script:
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@example
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#!/bin/sh
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BASE_URL=$@{1:-'.'@}
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openssl rand 16 > file.key
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echo $BASE_URL/file.key > file.keyinfo
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echo file.key >> file.keyinfo
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echo $(openssl rand -hex 16) >> file.keyinfo
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ffmpeg -f lavfi -re -i testsrc -c:v h264 -hls_flags delete_segments \
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-hls_key_info_file file.keyinfo out.m3u8
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@end example
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@item hls_flags single_file
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If this flag is set, the muxer will store all segments in a single MPEG-TS
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file, and will use byte ranges in the playlist. HLS playlists generated with
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this way will have the version number 4.
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For example:
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@example
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ffmpeg -i in.nut -hls_flags single_file out.m3u8
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@end example
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Will produce the playlist, @file{out.m3u8}, and a single segment file,
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@file{out.ts}.
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@item hls_flags delete_segments
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Segment files removed from the playlist are deleted after a period of time
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equal to the duration of the segment plus the duration of the playlist.
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@end table
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@anchor{ico}
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@section ico
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ICO file muxer.
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Microsoft's icon file format (ICO) has some strict limitations that should be noted:
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@itemize
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@item
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Size cannot exceed 256 pixels in any dimension
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@item
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Only BMP and PNG images can be stored
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@item
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If a BMP image is used, it must be one of the following pixel formats:
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@example
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BMP Bit Depth FFmpeg Pixel Format
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1bit pal8
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4bit pal8
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8bit pal8
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16bit rgb555le
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24bit bgr24
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32bit bgra
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@end example
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@item
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If a BMP image is used, it must use the BITMAPINFOHEADER DIB header
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@item
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If a PNG image is used, it must use the rgba pixel format
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@end itemize
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@anchor{image2}
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@section image2
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Image file muxer.
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The image file muxer writes video frames to image files.
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The output filenames are specified by a pattern, which can be used to
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produce sequentially numbered series of files.
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The pattern may contain the string "%d" or "%0@var{N}d", this string
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specifies the position of the characters representing a numbering in
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the filenames. If the form "%0@var{N}d" is used, the string
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representing the number in each filename is 0-padded to @var{N}
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digits. The literal character '%' can be specified in the pattern with
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the string "%%".
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If the pattern contains "%d" or "%0@var{N}d", the first filename of
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the file list specified will contain the number 1, all the following
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numbers will be sequential.
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The pattern may contain a suffix which is used to automatically
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determine the format of the image files to write.
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For example the pattern "img-%03d.bmp" will specify a sequence of
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filenames of the form @file{img-001.bmp}, @file{img-002.bmp}, ...,
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@file{img-010.bmp}, etc.
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The pattern "img%%-%d.jpg" will specify a sequence of filenames of the
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form @file{img%-1.jpg}, @file{img%-2.jpg}, ..., @file{img%-10.jpg},
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etc.
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@subsection Examples
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The following example shows how to use @command{ffmpeg} for creating a
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sequence of files @file{img-001.jpeg}, @file{img-002.jpeg}, ...,
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taking one image every second from the input video:
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@example
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ffmpeg -i in.avi -vsync 1 -r 1 -f image2 'img-%03d.jpeg'
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@end example
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Note that with @command{ffmpeg}, if the format is not specified with the
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@code{-f} option and the output filename specifies an image file
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format, the image2 muxer is automatically selected, so the previous
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command can be written as:
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@example
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ffmpeg -i in.avi -vsync 1 -r 1 'img-%03d.jpeg'
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@end example
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Note also that the pattern must not necessarily contain "%d" or
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"%0@var{N}d", for example to create a single image file
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@file{img.jpeg} from the input video you can employ the command:
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@example
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ffmpeg -i in.avi -f image2 -frames:v 1 img.jpeg
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@end example
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The @option{strftime} option allows you to expand the filename with
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date and time information. Check the documentation of
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the @code{strftime()} function for the syntax.
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For example to generate image files from the @code{strftime()}
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"%Y-%m-%d_%H-%M-%S" pattern, the following @command{ffmpeg} command
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can be used:
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@example
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ffmpeg -f v4l2 -r 1 -i /dev/video0 -f image2 -strftime 1 "%Y-%m-%d_%H-%M-%S.jpg"
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@end example
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@subsection Options
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@table @option
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@item start_number
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Start the sequence from the specified number. Default value is 0.
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@item update
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If set to 1, the filename will always be interpreted as just a
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filename, not a pattern, and the corresponding file will be continuously
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overwritten with new images. Default value is 0.
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@item strftime
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If set to 1, expand the filename with date and time information from
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@code{strftime()}. Default value is 0.
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@end table
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The image muxer supports the .Y.U.V image file format. This format is
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special in that that each image frame consists of three files, for
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each of the YUV420P components. To read or write this image file format,
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specify the name of the '.Y' file. The muxer will automatically open the
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'.U' and '.V' files as required.
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@section matroska
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Matroska container muxer.
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This muxer implements the matroska and webm container specs.
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@subsection Metadata
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The recognized metadata settings in this muxer are:
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@table @option
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@item title
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Set title name provided to a single track.
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@item language
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Specify the language of the track in the Matroska languages form.
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The language can be either the 3 letters bibliographic ISO-639-2 (ISO
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639-2/B) form (like "fre" for French), or a language code mixed with a
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country code for specialities in languages (like "fre-ca" for Canadian
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French).
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@item stereo_mode
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Set stereo 3D video layout of two views in a single video track.
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The following values are recognized:
|
|
@table @samp
|
|
@item mono
|
|
video is not stereo
|
|
@item left_right
|
|
Both views are arranged side by side, Left-eye view is on the left
|
|
@item bottom_top
|
|
Both views are arranged in top-bottom orientation, Left-eye view is at bottom
|
|
@item top_bottom
|
|
Both views are arranged in top-bottom orientation, Left-eye view is on top
|
|
@item checkerboard_rl
|
|
Each view is arranged in a checkerboard interleaved pattern, Left-eye view being first
|
|
@item checkerboard_lr
|
|
Each view is arranged in a checkerboard interleaved pattern, Right-eye view being first
|
|
@item row_interleaved_rl
|
|
Each view is constituted by a row based interleaving, Right-eye view is first row
|
|
@item row_interleaved_lr
|
|
Each view is constituted by a row based interleaving, Left-eye view is first row
|
|
@item col_interleaved_rl
|
|
Both views are arranged in a column based interleaving manner, Right-eye view is first column
|
|
@item col_interleaved_lr
|
|
Both views are arranged in a column based interleaving manner, Left-eye view is first column
|
|
@item anaglyph_cyan_red
|
|
All frames are in anaglyph format viewable through red-cyan filters
|
|
@item right_left
|
|
Both views are arranged side by side, Right-eye view is on the left
|
|
@item anaglyph_green_magenta
|
|
All frames are in anaglyph format viewable through green-magenta filters
|
|
@item block_lr
|
|
Both eyes laced in one Block, Left-eye view is first
|
|
@item block_rl
|
|
Both eyes laced in one Block, Right-eye view is first
|
|
@end table
|
|
@end table
|
|
|
|
For example a 3D WebM clip can be created using the following command line:
|
|
@example
|
|
ffmpeg -i sample_left_right_clip.mpg -an -c:v libvpx -metadata stereo_mode=left_right -y stereo_clip.webm
|
|
@end example
|
|
|
|
@subsection Options
|
|
|
|
This muxer supports the following options:
|
|
|
|
@table @option
|
|
@item reserve_index_space
|
|
By default, this muxer writes the index for seeking (called cues in Matroska
|
|
terms) at the end of the file, because it cannot know in advance how much space
|
|
to leave for the index at the beginning of the file. However for some use cases
|
|
-- e.g. streaming where seeking is possible but slow -- it is useful to put the
|
|
index at the beginning of the file.
|
|
|
|
If this option is set to a non-zero value, the muxer will reserve a given amount
|
|
of space in the file header and then try to write the cues there when the muxing
|
|
finishes. If the available space does not suffice, muxing will fail. A safe size
|
|
for most use cases should be about 50kB per hour of video.
|
|
|
|
Note that cues are only written if the output is seekable and this option will
|
|
have no effect if it is not.
|
|
@end table
|
|
|
|
@anchor{md5}
|
|
@section md5
|
|
|
|
MD5 testing format.
|
|
|
|
This muxer computes and prints the MD5 hash of all the input audio
|
|
and video frames. By default audio frames are converted to signed
|
|
16-bit raw audio and video frames to raw video before computing the
|
|
hash. Timestamps are ignored.
|
|
|
|
The output of the muxer consists of a single line of the form:
|
|
MD5=@var{MD5}, where @var{MD5} is a hexadecimal number representing
|
|
the computed MD5 hash.
|
|
|
|
For example to compute the MD5 hash of the input converted to raw
|
|
audio and video, and store it in the file @file{out.md5}:
|
|
@example
|
|
ffmpeg -i INPUT -f md5 out.md5
|
|
@end example
|
|
|
|
You can print the MD5 to stdout with the command:
|
|
@example
|
|
ffmpeg -i INPUT -f md5 -
|
|
@end example
|
|
|
|
See also the @ref{framemd5} muxer.
|
|
|
|
@section mov, mp4, ismv
|
|
|
|
MOV/MP4/ISMV (Smooth Streaming) muxer.
|
|
|
|
The mov/mp4/ismv muxer supports fragmentation. Normally, a MOV/MP4
|
|
file has all the metadata about all packets stored in one location
|
|
(written at the end of the file, it can be moved to the start for
|
|
better playback by adding @var{faststart} to the @var{movflags}, or
|
|
using the @command{qt-faststart} tool). A fragmented
|
|
file consists of a number of fragments, where packets and metadata
|
|
about these packets are stored together. Writing a fragmented
|
|
file has the advantage that the file is decodable even if the
|
|
writing is interrupted (while a normal MOV/MP4 is undecodable if
|
|
it is not properly finished), and it requires less memory when writing
|
|
very long files (since writing normal MOV/MP4 files stores info about
|
|
every single packet in memory until the file is closed). The downside
|
|
is that it is less compatible with other applications.
|
|
|
|
@subsection Options
|
|
|
|
Fragmentation is enabled by setting one of the AVOptions that define
|
|
how to cut the file into fragments:
|
|
|
|
@table @option
|
|
@item -moov_size @var{bytes}
|
|
Reserves space for the moov atom at the beginning of the file instead of placing the
|
|
moov atom at the end. If the space reserved is insufficient, muxing will fail.
|
|
@item -movflags frag_keyframe
|
|
Start a new fragment at each video keyframe.
|
|
@item -frag_duration @var{duration}
|
|
Create fragments that are @var{duration} microseconds long.
|
|
@item -frag_size @var{size}
|
|
Create fragments that contain up to @var{size} bytes of payload data.
|
|
@item -movflags frag_custom
|
|
Allow the caller to manually choose when to cut fragments, by
|
|
calling @code{av_write_frame(ctx, NULL)} to write a fragment with
|
|
the packets written so far. (This is only useful with other
|
|
applications integrating libavformat, not from @command{ffmpeg}.)
|
|
@item -min_frag_duration @var{duration}
|
|
Don't create fragments that are shorter than @var{duration} microseconds long.
|
|
@end table
|
|
|
|
If more than one condition is specified, fragments are cut when
|
|
one of the specified conditions is fulfilled. The exception to this is
|
|
@code{-min_frag_duration}, which has to be fulfilled for any of the other
|
|
conditions to apply.
|
|
|
|
Additionally, the way the output file is written can be adjusted
|
|
through a few other options:
|
|
|
|
@table @option
|
|
@item -movflags empty_moov
|
|
Write an initial moov atom directly at the start of the file, without
|
|
describing any samples in it. Generally, an mdat/moov pair is written
|
|
at the start of the file, as a normal MOV/MP4 file, containing only
|
|
a short portion of the file. With this option set, there is no initial
|
|
mdat atom, and the moov atom only describes the tracks but has
|
|
a zero duration.
|
|
|
|
This option is implicitly set when writing ismv (Smooth Streaming) files.
|
|
@item -movflags separate_moof
|
|
Write a separate moof (movie fragment) atom for each track. Normally,
|
|
packets for all tracks are written in a moof atom (which is slightly
|
|
more efficient), but with this option set, the muxer writes one moof/mdat
|
|
pair for each track, making it easier to separate tracks.
|
|
|
|
This option is implicitly set when writing ismv (Smooth Streaming) files.
|
|
@item -movflags faststart
|
|
Run a second pass moving the index (moov atom) to the beginning of the file.
|
|
This operation can take a while, and will not work in various situations such
|
|
as fragmented output, thus it is not enabled by default.
|
|
@item -movflags rtphint
|
|
Add RTP hinting tracks to the output file.
|
|
@item -movflags disable_chpl
|
|
Disable Nero chapter markers (chpl atom). Normally, both Nero chapters
|
|
and a QuickTime chapter track are written to the file. With this option
|
|
set, only the QuickTime chapter track will be written. Nero chapters can
|
|
cause failures when the file is reprocessed with certain tagging programs, like
|
|
mp3Tag 2.61a and iTunes 11.3, most likely other versions are affected as well.
|
|
@item -movflags omit_tfhd_offset
|
|
Do not write any absolute base_data_offset in tfhd atoms. This avoids
|
|
tying fragments to absolute byte positions in the file/streams.
|
|
@item -movflags default_base_moof
|
|
Similarly to the omit_tfhd_offset, this flag avoids writing the
|
|
absolute base_data_offset field in tfhd atoms, but does so by using
|
|
the new default-base-is-moof flag instead. This flag is new from
|
|
14496-12:2012. This may make the fragments easier to parse in certain
|
|
circumstances (avoiding basing track fragment location calculations
|
|
on the implicit end of the previous track fragment).
|
|
@end table
|
|
|
|
@subsection Example
|
|
|
|
Smooth Streaming content can be pushed in real time to a publishing
|
|
point on IIS with this muxer. Example:
|
|
@example
|
|
ffmpeg -re @var{<normal input/transcoding options>} -movflags isml+frag_keyframe -f ismv http://server/publishingpoint.isml/Streams(Encoder1)
|
|
@end example
|
|
|
|
@subsection Audible AAX
|
|
|
|
Audible AAX files are encrypted M4B files, and they can be decrypted by specifying a 4 byte activation secret.
|
|
@example
|
|
ffmpeg -activation_bytes 1CEB00DA -i test.aax -vn -c:a copy output.mp4
|
|
@end example
|
|
|
|
@section mp3
|
|
|
|
The MP3 muxer writes a raw MP3 stream with the following optional features:
|
|
@itemize @bullet
|
|
@item
|
|
An ID3v2 metadata header at the beginning (enabled by default). Versions 2.3 and
|
|
2.4 are supported, the @code{id3v2_version} private option controls which one is
|
|
used (3 or 4). Setting @code{id3v2_version} to 0 disables the ID3v2 header
|
|
completely.
|
|
|
|
The muxer supports writing attached pictures (APIC frames) to the ID3v2 header.
|
|
The pictures are supplied to the muxer in form of a video stream with a single
|
|
packet. There can be any number of those streams, each will correspond to a
|
|
single APIC frame. The stream metadata tags @var{title} and @var{comment} map
|
|
to APIC @var{description} and @var{picture type} respectively. See
|
|
@url{http://id3.org/id3v2.4.0-frames} for allowed picture types.
|
|
|
|
Note that the APIC frames must be written at the beginning, so the muxer will
|
|
buffer the audio frames until it gets all the pictures. It is therefore advised
|
|
to provide the pictures as soon as possible to avoid excessive buffering.
|
|
|
|
@item
|
|
A Xing/LAME frame right after the ID3v2 header (if present). It is enabled by
|
|
default, but will be written only if the output is seekable. The
|
|
@code{write_xing} private option can be used to disable it. The frame contains
|
|
various information that may be useful to the decoder, like the audio duration
|
|
or encoder delay.
|
|
|
|
@item
|
|
A legacy ID3v1 tag at the end of the file (disabled by default). It may be
|
|
enabled with the @code{write_id3v1} private option, but as its capabilities are
|
|
very limited, its usage is not recommended.
|
|
@end itemize
|
|
|
|
Examples:
|
|
|
|
Write an mp3 with an ID3v2.3 header and an ID3v1 footer:
|
|
@example
|
|
ffmpeg -i INPUT -id3v2_version 3 -write_id3v1 1 out.mp3
|
|
@end example
|
|
|
|
To attach a picture to an mp3 file select both the audio and the picture stream
|
|
with @code{map}:
|
|
@example
|
|
ffmpeg -i input.mp3 -i cover.png -c copy -map 0 -map 1
|
|
-metadata:s:v title="Album cover" -metadata:s:v comment="Cover (Front)" out.mp3
|
|
@end example
|
|
|
|
Write a "clean" MP3 without any extra features:
|
|
@example
|
|
ffmpeg -i input.wav -write_xing 0 -id3v2_version 0 out.mp3
|
|
@end example
|
|
|
|
@section mpegts
|
|
|
|
MPEG transport stream muxer.
|
|
|
|
This muxer implements ISO 13818-1 and part of ETSI EN 300 468.
|
|
|
|
The recognized metadata settings in mpegts muxer are @code{service_provider}
|
|
and @code{service_name}. If they are not set the default for
|
|
@code{service_provider} is "FFmpeg" and the default for
|
|
@code{service_name} is "Service01".
|
|
|
|
@subsection Options
|
|
|
|
The muxer options are:
|
|
|
|
@table @option
|
|
@item -mpegts_original_network_id @var{number}
|
|
Set the original_network_id (default 0x0001). This is unique identifier
|
|
of a network in DVB. Its main use is in the unique identification of a
|
|
service through the path Original_Network_ID, Transport_Stream_ID.
|
|
@item -mpegts_transport_stream_id @var{number}
|
|
Set the transport_stream_id (default 0x0001). This identifies a
|
|
transponder in DVB.
|
|
@item -mpegts_service_id @var{number}
|
|
Set the service_id (default 0x0001) also known as program in DVB.
|
|
@item -mpegts_service_type @var{number}
|
|
Set the program service_type (default @var{digital_tv}), see below
|
|
a list of pre defined values.
|
|
@item -mpegts_pmt_start_pid @var{number}
|
|
Set the first PID for PMT (default 0x1000, max 0x1f00).
|
|
@item -mpegts_start_pid @var{number}
|
|
Set the first PID for data packets (default 0x0100, max 0x0f00).
|
|
@item -mpegts_m2ts_mode @var{number}
|
|
Enable m2ts mode if set to 1. Default value is -1 which disables m2ts mode.
|
|
@item -muxrate @var{number}
|
|
Set a constant muxrate (default VBR).
|
|
@item -pcr_period @var{numer}
|
|
Override the default PCR retransmission time (default 20ms), ignored
|
|
if variable muxrate is selected.
|
|
@item pat_period @var{number}
|
|
Maximal time in seconds between PAT/PMT tables.
|
|
@item sdt_period @var{number}
|
|
Maximal time in seconds between SDT tables.
|
|
@item -pes_payload_size @var{number}
|
|
Set minimum PES packet payload in bytes.
|
|
@item -mpegts_flags @var{flags}
|
|
Set flags (see below).
|
|
@item -mpegts_copyts @var{number}
|
|
Preserve original timestamps, if value is set to 1. Default value is -1, which
|
|
results in shifting timestamps so that they start from 0.
|
|
@item -tables_version @var{number}
|
|
Set PAT, PMT and SDT version (default 0, valid values are from 0 to 31, inclusively).
|
|
This option allows updating stream structure so that standard consumer may
|
|
detect the change. To do so, reopen output AVFormatContext (in case of API
|
|
usage) or restart ffmpeg instance, cyclically changing tables_version value:
|
|
@example
|
|
ffmpeg -i source1.ts -codec copy -f mpegts -tables_version 0 udp://1.1.1.1:1111
|
|
ffmpeg -i source2.ts -codec copy -f mpegts -tables_version 1 udp://1.1.1.1:1111
|
|
...
|
|
ffmpeg -i source3.ts -codec copy -f mpegts -tables_version 31 udp://1.1.1.1:1111
|
|
ffmpeg -i source1.ts -codec copy -f mpegts -tables_version 0 udp://1.1.1.1:1111
|
|
ffmpeg -i source2.ts -codec copy -f mpegts -tables_version 1 udp://1.1.1.1:1111
|
|
...
|
|
@end example
|
|
@end table
|
|
|
|
Option mpegts_service_type accepts the following values:
|
|
|
|
@table @option
|
|
@item hex_value
|
|
Any hexdecimal value between 0x01 to 0xff as defined in ETSI 300 468.
|
|
@item digital_tv
|
|
Digital TV service.
|
|
@item digital_radio
|
|
Digital Radio service.
|
|
@item teletext
|
|
Teletext service.
|
|
@item advanced_codec_digital_radio
|
|
Advanced Codec Digital Radio service.
|
|
@item mpeg2_digital_hdtv
|
|
MPEG2 Digital HDTV service.
|
|
@item advanced_codec_digital_sdtv
|
|
Advanced Codec Digital SDTV service.
|
|
@item advanced_codec_digital_hdtv
|
|
Advanced Codec Digital HDTV service.
|
|
@end table
|
|
|
|
Option mpegts_flags may take a set of such flags:
|
|
|
|
@table @option
|
|
@item resend_headers
|
|
Reemit PAT/PMT before writing the next packet.
|
|
@item latm
|
|
Use LATM packetization for AAC.
|
|
@item pat_pmt_at_frames
|
|
Reemit PAT and PMT at each video frame.
|
|
@item system_b
|
|
Conform to System B (DVB) instead of System A (ATSC).
|
|
@end table
|
|
|
|
@subsection Example
|
|
|
|
@example
|
|
ffmpeg -i file.mpg -c copy \
|
|
-mpegts_original_network_id 0x1122 \
|
|
-mpegts_transport_stream_id 0x3344 \
|
|
-mpegts_service_id 0x5566 \
|
|
-mpegts_pmt_start_pid 0x1500 \
|
|
-mpegts_start_pid 0x150 \
|
|
-metadata service_provider="Some provider" \
|
|
-metadata service_name="Some Channel" \
|
|
-y out.ts
|
|
@end example
|
|
|
|
@section mxf, mxf_d10
|
|
|
|
MXF muxer.
|
|
|
|
@subsection Options
|
|
|
|
The muxer options are:
|
|
|
|
@table @option
|
|
@item store_user_comments @var{bool}
|
|
Set if user comments should be stored if available or never.
|
|
IRT D-10 does not allow user comments. The default is thus to write them for
|
|
mxf but not for mxf_d10
|
|
@end table
|
|
|
|
@section null
|
|
|
|
Null muxer.
|
|
|
|
This muxer does not generate any output file, it is mainly useful for
|
|
testing or benchmarking purposes.
|
|
|
|
For example to benchmark decoding with @command{ffmpeg} you can use the
|
|
command:
|
|
@example
|
|
ffmpeg -benchmark -i INPUT -f null out.null
|
|
@end example
|
|
|
|
Note that the above command does not read or write the @file{out.null}
|
|
file, but specifying the output file is required by the @command{ffmpeg}
|
|
syntax.
|
|
|
|
Alternatively you can write the command as:
|
|
@example
|
|
ffmpeg -benchmark -i INPUT -f null -
|
|
@end example
|
|
|
|
@section nut
|
|
|
|
@table @option
|
|
@item -syncpoints @var{flags}
|
|
Change the syncpoint usage in nut:
|
|
@table @option
|
|
@item @var{default} use the normal low-overhead seeking aids.
|
|
@item @var{none} do not use the syncpoints at all, reducing the overhead but making the stream non-seekable;
|
|
Use of this option is not recommended, as the resulting files are very damage
|
|
sensitive and seeking is not possible. Also in general the overhead from
|
|
syncpoints is negligible. Note, -@code{write_index} 0 can be used to disable
|
|
all growing data tables, allowing to mux endless streams with limited memory
|
|
and without these disadvantages.
|
|
@item @var{timestamped} extend the syncpoint with a wallclock field.
|
|
@end table
|
|
The @var{none} and @var{timestamped} flags are experimental.
|
|
@item -write_index @var{bool}
|
|
Write index at the end, the default is to write an index.
|
|
@end table
|
|
|
|
@example
|
|
ffmpeg -i INPUT -f_strict experimental -syncpoints none - | processor
|
|
@end example
|
|
|
|
@section ogg
|
|
|
|
Ogg container muxer.
|
|
|
|
@table @option
|
|
@item -page_duration @var{duration}
|
|
Preferred page duration, in microseconds. The muxer will attempt to create
|
|
pages that are approximately @var{duration} microseconds long. This allows the
|
|
user to compromise between seek granularity and container overhead. The default
|
|
is 1 second. A value of 0 will fill all segments, making pages as large as
|
|
possible. A value of 1 will effectively use 1 packet-per-page in most
|
|
situations, giving a small seek granularity at the cost of additional container
|
|
overhead.
|
|
@item -serial_offset @var{value}
|
|
Serial value from which to set the streams serial number.
|
|
Setting it to different and sufficiently large values ensures that the produced
|
|
ogg files can be safely chained.
|
|
|
|
@end table
|
|
|
|
@anchor{segment}
|
|
@section segment, stream_segment, ssegment
|
|
|
|
Basic stream segmenter.
|
|
|
|
This muxer outputs streams to a number of separate files of nearly
|
|
fixed duration. Output filename pattern can be set in a fashion
|
|
similar to @ref{image2}, or by using a @code{strftime} template if
|
|
the @option{strftime} option is enabled.
|
|
|
|
@code{stream_segment} is a variant of the muxer used to write to
|
|
streaming output formats, i.e. which do not require global headers,
|
|
and is recommended for outputting e.g. to MPEG transport stream segments.
|
|
@code{ssegment} is a shorter alias for @code{stream_segment}.
|
|
|
|
Every segment starts with a keyframe of the selected reference stream,
|
|
which is set through the @option{reference_stream} option.
|
|
|
|
Note that if you want accurate splitting for a video file, you need to
|
|
make the input key frames correspond to the exact splitting times
|
|
expected by the segmenter, or the segment muxer will start the new
|
|
segment with the key frame found next after the specified start
|
|
time.
|
|
|
|
The segment muxer works best with a single constant frame rate video.
|
|
|
|
Optionally it can generate a list of the created segments, by setting
|
|
the option @var{segment_list}. The list type is specified by the
|
|
@var{segment_list_type} option. The entry filenames in the segment
|
|
list are set by default to the basename of the corresponding segment
|
|
files.
|
|
|
|
See also the @ref{hls} muxer, which provides a more specific
|
|
implementation for HLS segmentation.
|
|
|
|
@subsection Options
|
|
|
|
The segment muxer supports the following options:
|
|
|
|
@table @option
|
|
@item reference_stream @var{specifier}
|
|
Set the reference stream, as specified by the string @var{specifier}.
|
|
If @var{specifier} is set to @code{auto}, the reference is chosen
|
|
automatically. Otherwise it must be a stream specifier (see the ``Stream
|
|
specifiers'' chapter in the ffmpeg manual) which specifies the
|
|
reference stream. The default value is @code{auto}.
|
|
|
|
@item segment_format @var{format}
|
|
Override the inner container format, by default it is guessed by the filename
|
|
extension.
|
|
|
|
@item segment_format_options @var{options_list}
|
|
Set output format options using a :-separated list of key=value
|
|
parameters. Values containing the @code{:} special character must be
|
|
escaped.
|
|
|
|
@item segment_list @var{name}
|
|
Generate also a listfile named @var{name}. If not specified no
|
|
listfile is generated.
|
|
|
|
@item segment_list_flags @var{flags}
|
|
Set flags affecting the segment list generation.
|
|
|
|
It currently supports the following flags:
|
|
@table @samp
|
|
@item cache
|
|
Allow caching (only affects M3U8 list files).
|
|
|
|
@item live
|
|
Allow live-friendly file generation.
|
|
@end table
|
|
|
|
@item segment_list_size @var{size}
|
|
Update the list file so that it contains at most @var{size}
|
|
segments. If 0 the list file will contain all the segments. Default
|
|
value is 0.
|
|
|
|
@item segment_list_entry_prefix @var{prefix}
|
|
Prepend @var{prefix} to each entry. Useful to generate absolute paths.
|
|
By default no prefix is applied.
|
|
|
|
@item segment_list_type @var{type}
|
|
Select the listing format.
|
|
|
|
The following values are recognized:
|
|
@table @samp
|
|
@item flat
|
|
Generate a flat list for the created segments, one segment per line.
|
|
|
|
@item csv, ext
|
|
Generate a list for the created segments, one segment per line,
|
|
each line matching the format (comma-separated values):
|
|
@example
|
|
@var{segment_filename},@var{segment_start_time},@var{segment_end_time}
|
|
@end example
|
|
|
|
@var{segment_filename} is the name of the output file generated by the
|
|
muxer according to the provided pattern. CSV escaping (according to
|
|
RFC4180) is applied if required.
|
|
|
|
@var{segment_start_time} and @var{segment_end_time} specify
|
|
the segment start and end time expressed in seconds.
|
|
|
|
A list file with the suffix @code{".csv"} or @code{".ext"} will
|
|
auto-select this format.
|
|
|
|
@samp{ext} is deprecated in favor or @samp{csv}.
|
|
|
|
@item ffconcat
|
|
Generate an ffconcat file for the created segments. The resulting file
|
|
can be read using the FFmpeg @ref{concat} demuxer.
|
|
|
|
A list file with the suffix @code{".ffcat"} or @code{".ffconcat"} will
|
|
auto-select this format.
|
|
|
|
@item m3u8
|
|
Generate an extended M3U8 file, version 3, compliant with
|
|
@url{http://tools.ietf.org/id/draft-pantos-http-live-streaming}.
|
|
|
|
A list file with the suffix @code{".m3u8"} will auto-select this format.
|
|
@end table
|
|
|
|
If not specified the type is guessed from the list file name suffix.
|
|
|
|
@item segment_time @var{time}
|
|
Set segment duration to @var{time}, the value must be a duration
|
|
specification. Default value is "2". See also the
|
|
@option{segment_times} option.
|
|
|
|
Note that splitting may not be accurate, unless you force the
|
|
reference stream key-frames at the given time. See the introductory
|
|
notice and the examples below.
|
|
|
|
@item segment_atclocktime @var{1|0}
|
|
If set to "1" split at regular clock time intervals starting from 00:00
|
|
o'clock. The @var{time} value specified in @option{segment_time} is
|
|
used for setting the length of the splitting interval.
|
|
|
|
For example with @option{segment_time} set to "900" this makes it possible
|
|
to create files at 12:00 o'clock, 12:15, 12:30, etc.
|
|
|
|
Default value is "0".
|
|
|
|
@item segment_clocktime_offset @var{duration}
|
|
Delay the segment splitting times with the specified duration when using
|
|
@option{segment_atclocktime}.
|
|
|
|
For example with @option{segment_time} set to "900" and
|
|
@option{segment_clocktime_offset} set to "300" this makes it possible to
|
|
create files at 12:05, 12:20, 12:35, etc.
|
|
|
|
Default value is "0".
|
|
|
|
@item segment_clocktime_wrap_duration @var{duration}
|
|
Force the segmenter to only start a new segment if a packet reaches the muxer
|
|
within the specified duration after the segmenting clock time. This way you
|
|
can make the segmenter more resilient to backward local time jumps, such as
|
|
leap seconds or transition to standard time from daylight savings time.
|
|
|
|
Assuming that the delay between the packets of your source is less than 0.5
|
|
second you can detect a leap second by specifying 0.5 as the duration.
|
|
|
|
Default is the maximum possible duration which means starting a new segment
|
|
regardless of the elapsed time since the last clock time.
|
|
|
|
@item segment_time_delta @var{delta}
|
|
Specify the accuracy time when selecting the start time for a
|
|
segment, expressed as a duration specification. Default value is "0".
|
|
|
|
When delta is specified a key-frame will start a new segment if its
|
|
PTS satisfies the relation:
|
|
@example
|
|
PTS >= start_time - time_delta
|
|
@end example
|
|
|
|
This option is useful when splitting video content, which is always
|
|
split at GOP boundaries, in case a key frame is found just before the
|
|
specified split time.
|
|
|
|
In particular may be used in combination with the @file{ffmpeg} option
|
|
@var{force_key_frames}. The key frame times specified by
|
|
@var{force_key_frames} may not be set accurately because of rounding
|
|
issues, with the consequence that a key frame time may result set just
|
|
before the specified time. For constant frame rate videos a value of
|
|
1/(2*@var{frame_rate}) should address the worst case mismatch between
|
|
the specified time and the time set by @var{force_key_frames}.
|
|
|
|
@item segment_times @var{times}
|
|
Specify a list of split points. @var{times} contains a list of comma
|
|
separated duration specifications, in increasing order. See also
|
|
the @option{segment_time} option.
|
|
|
|
@item segment_frames @var{frames}
|
|
Specify a list of split video frame numbers. @var{frames} contains a
|
|
list of comma separated integer numbers, in increasing order.
|
|
|
|
This option specifies to start a new segment whenever a reference
|
|
stream key frame is found and the sequential number (starting from 0)
|
|
of the frame is greater or equal to the next value in the list.
|
|
|
|
@item segment_wrap @var{limit}
|
|
Wrap around segment index once it reaches @var{limit}.
|
|
|
|
@item segment_start_number @var{number}
|
|
Set the sequence number of the first segment. Defaults to @code{0}.
|
|
|
|
@item strftime @var{1|0}
|
|
Use the @code{strftime} function to define the name of the new
|
|
segments to write. If this is selected, the output segment name must
|
|
contain a @code{strftime} function template. Default value is
|
|
@code{0}.
|
|
|
|
@item break_non_keyframes @var{1|0}
|
|
If enabled, allow segments to start on frames other than keyframes. This
|
|
improves behavior on some players when the time between keyframes is
|
|
inconsistent, but may make things worse on others, and can cause some oddities
|
|
during seeking. Defaults to @code{0}.
|
|
|
|
@item reset_timestamps @var{1|0}
|
|
Reset timestamps at the begin of each segment, so that each segment
|
|
will start with near-zero timestamps. It is meant to ease the playback
|
|
of the generated segments. May not work with some combinations of
|
|
muxers/codecs. It is set to @code{0} by default.
|
|
|
|
@item initial_offset @var{offset}
|
|
Specify timestamp offset to apply to the output packet timestamps. The
|
|
argument must be a time duration specification, and defaults to 0.
|
|
@end table
|
|
|
|
@subsection Examples
|
|
|
|
@itemize
|
|
@item
|
|
Remux the content of file @file{in.mkv} to a list of segments
|
|
@file{out-000.nut}, @file{out-001.nut}, etc., and write the list of
|
|
generated segments to @file{out.list}:
|
|
@example
|
|
ffmpeg -i in.mkv -codec copy -map 0 -f segment -segment_list out.list out%03d.nut
|
|
@end example
|
|
|
|
@item
|
|
Segment input and set output format options for the output segments:
|
|
@example
|
|
ffmpeg -i in.mkv -f segment -segment_time 10 -segment_format_options movflags=+faststart out%03d.mp4
|
|
@end example
|
|
|
|
@item
|
|
Segment the input file according to the split points specified by the
|
|
@var{segment_times} option:
|
|
@example
|
|
ffmpeg -i in.mkv -codec copy -map 0 -f segment -segment_list out.csv -segment_times 1,2,3,5,8,13,21 out%03d.nut
|
|
@end example
|
|
|
|
@item
|
|
Use the @command{ffmpeg} @option{force_key_frames}
|
|
option to force key frames in the input at the specified location, together
|
|
with the segment option @option{segment_time_delta} to account for
|
|
possible roundings operated when setting key frame times.
|
|
@example
|
|
ffmpeg -i in.mkv -force_key_frames 1,2,3,5,8,13,21 -codec:v mpeg4 -codec:a pcm_s16le -map 0 \
|
|
-f segment -segment_list out.csv -segment_times 1,2,3,5,8,13,21 -segment_time_delta 0.05 out%03d.nut
|
|
@end example
|
|
In order to force key frames on the input file, transcoding is
|
|
required.
|
|
|
|
@item
|
|
Segment the input file by splitting the input file according to the
|
|
frame numbers sequence specified with the @option{segment_frames} option:
|
|
@example
|
|
ffmpeg -i in.mkv -codec copy -map 0 -f segment -segment_list out.csv -segment_frames 100,200,300,500,800 out%03d.nut
|
|
@end example
|
|
|
|
@item
|
|
Convert the @file{in.mkv} to TS segments using the @code{libx264}
|
|
and @code{libfaac} encoders:
|
|
@example
|
|
ffmpeg -i in.mkv -map 0 -codec:v libx264 -codec:a libfaac -f ssegment -segment_list out.list out%03d.ts
|
|
@end example
|
|
|
|
@item
|
|
Segment the input file, and create an M3U8 live playlist (can be used
|
|
as live HLS source):
|
|
@example
|
|
ffmpeg -re -i in.mkv -codec copy -map 0 -f segment -segment_list playlist.m3u8 \
|
|
-segment_list_flags +live -segment_time 10 out%03d.mkv
|
|
@end example
|
|
@end itemize
|
|
|
|
@section smoothstreaming
|
|
|
|
Smooth Streaming muxer generates a set of files (Manifest, chunks) suitable for serving with conventional web server.
|
|
|
|
@table @option
|
|
@item window_size
|
|
Specify the number of fragments kept in the manifest. Default 0 (keep all).
|
|
|
|
@item extra_window_size
|
|
Specify the number of fragments kept outside of the manifest before removing from disk. Default 5.
|
|
|
|
@item lookahead_count
|
|
Specify the number of lookahead fragments. Default 2.
|
|
|
|
@item min_frag_duration
|
|
Specify the minimum fragment duration (in microseconds). Default 5000000.
|
|
|
|
@item remove_at_exit
|
|
Specify whether to remove all fragments when finished. Default 0 (do not remove).
|
|
|
|
@end table
|
|
|
|
@section tee
|
|
|
|
The tee muxer can be used to write the same data to several files or any
|
|
other kind of muxer. It can be used, for example, to both stream a video to
|
|
the network and save it to disk at the same time.
|
|
|
|
It is different from specifying several outputs to the @command{ffmpeg}
|
|
command-line tool because the audio and video data will be encoded only once
|
|
with the tee muxer; encoding can be a very expensive process. It is not
|
|
useful when using the libavformat API directly because it is then possible
|
|
to feed the same packets to several muxers directly.
|
|
|
|
The slave outputs are specified in the file name given to the muxer,
|
|
separated by '|'. If any of the slave name contains the '|' separator,
|
|
leading or trailing spaces or any special character, it must be
|
|
escaped (see @ref{quoting_and_escaping,,the "Quoting and escaping"
|
|
section in the ffmpeg-utils(1) manual,ffmpeg-utils}).
|
|
|
|
Muxer options can be specified for each slave by prepending them as a list of
|
|
@var{key}=@var{value} pairs separated by ':', between square brackets. If
|
|
the options values contain a special character or the ':' separator, they
|
|
must be escaped; note that this is a second level escaping.
|
|
|
|
The following special options are also recognized:
|
|
@table @option
|
|
@item f
|
|
Specify the format name. Useful if it cannot be guessed from the
|
|
output name suffix.
|
|
|
|
@item bsfs[/@var{spec}]
|
|
Specify a list of bitstream filters to apply to the specified
|
|
output.
|
|
|
|
It is possible to specify to which streams a given bitstream filter
|
|
applies, by appending a stream specifier to the option separated by
|
|
@code{/}. @var{spec} must be a stream specifier (see @ref{Format
|
|
stream specifiers}). If the stream specifier is not specified, the
|
|
bitstream filters will be applied to all streams in the output.
|
|
|
|
Several bitstream filters can be specified, separated by ",".
|
|
|
|
@item select
|
|
Select the streams that should be mapped to the slave output,
|
|
specified by a stream specifier. If not specified, this defaults to
|
|
all the input streams. You may use multiple stream specifiers
|
|
separated by commas (@code{,}) e.g.: @code{a:0,v}
|
|
@end table
|
|
|
|
@subsection Examples
|
|
|
|
@itemize
|
|
@item
|
|
Encode something and both archive it in a WebM file and stream it
|
|
as MPEG-TS over UDP (the streams need to be explicitly mapped):
|
|
@example
|
|
ffmpeg -i ... -c:v libx264 -c:a mp2 -f tee -map 0:v -map 0:a
|
|
"archive-20121107.mkv|[f=mpegts]udp://10.0.1.255:1234/"
|
|
@end example
|
|
|
|
@item
|
|
Use @command{ffmpeg} to encode the input, and send the output
|
|
to three different destinations. The @code{dump_extra} bitstream
|
|
filter is used to add extradata information to all the output video
|
|
keyframes packets, as requested by the MPEG-TS format. The select
|
|
option is applied to @file{out.aac} in order to make it contain only
|
|
audio packets.
|
|
@example
|
|
ffmpeg -i ... -map 0 -flags +global_header -c:v libx264 -c:a aac -strict experimental
|
|
-f tee "[bsfs/v=dump_extra]out.ts|[movflags=+faststart]out.mp4|[select=a]out.aac"
|
|
@end example
|
|
|
|
@item
|
|
As below, but select only stream @code{a:1} for the audio output. Note
|
|
that a second level escaping must be performed, as ":" is a special
|
|
character used to separate options.
|
|
@example
|
|
ffmpeg -i ... -map 0 -flags +global_header -c:v libx264 -c:a aac -strict experimental
|
|
-f tee "[bsfs/v=dump_extra]out.ts|[movflags=+faststart]out.mp4|[select=\'a:1\']out.aac"
|
|
@end example
|
|
@end itemize
|
|
|
|
Note: some codecs may need different options depending on the output format;
|
|
the auto-detection of this can not work with the tee muxer. The main example
|
|
is the @option{global_header} flag.
|
|
|
|
@section webm_dash_manifest
|
|
|
|
WebM DASH Manifest muxer.
|
|
|
|
This muxer implements the WebM DASH Manifest specification to generate the DASH
|
|
manifest XML. It also supports manifest generation for DASH live streams.
|
|
|
|
For more information see:
|
|
|
|
@itemize @bullet
|
|
@item
|
|
WebM DASH Specification: @url{https://sites.google.com/a/webmproject.org/wiki/adaptive-streaming/webm-dash-specification}
|
|
@item
|
|
ISO DASH Specification: @url{http://standards.iso.org/ittf/PubliclyAvailableStandards/c065274_ISO_IEC_23009-1_2014.zip}
|
|
@end itemize
|
|
|
|
@subsection Options
|
|
|
|
This muxer supports the following options:
|
|
|
|
@table @option
|
|
@item adaptation_sets
|
|
This option has the following syntax: "id=x,streams=a,b,c id=y,streams=d,e" where x and y are the
|
|
unique identifiers of the adaptation sets and a,b,c,d and e are the indices of the corresponding
|
|
audio and video streams. Any number of adaptation sets can be added using this option.
|
|
|
|
@item live
|
|
Set this to 1 to create a live stream DASH Manifest. Default: 0.
|
|
|
|
@item chunk_start_index
|
|
Start index of the first chunk. This will go in the @samp{startNumber} attribute
|
|
of the @samp{SegmentTemplate} element in the manifest. Default: 0.
|
|
|
|
@item chunk_duration_ms
|
|
Duration of each chunk in milliseconds. This will go in the @samp{duration}
|
|
attribute of the @samp{SegmentTemplate} element in the manifest. Default: 1000.
|
|
|
|
@item utc_timing_url
|
|
URL of the page that will return the UTC timestamp in ISO format. This will go
|
|
in the @samp{value} attribute of the @samp{UTCTiming} element in the manifest.
|
|
Default: None.
|
|
|
|
@item time_shift_buffer_depth
|
|
Smallest time (in seconds) shifting buffer for which any Representation is
|
|
guaranteed to be available. This will go in the @samp{timeShiftBufferDepth}
|
|
attribute of the @samp{MPD} element. Default: 60.
|
|
|
|
@item minimum_update_period
|
|
Minimum update period (in seconds) of the manifest. This will go in the
|
|
@samp{minimumUpdatePeriod} attribute of the @samp{MPD} element. Default: 0.
|
|
|
|
@end table
|
|
|
|
@subsection Example
|
|
@example
|
|
ffmpeg -f webm_dash_manifest -i video1.webm \
|
|
-f webm_dash_manifest -i video2.webm \
|
|
-f webm_dash_manifest -i audio1.webm \
|
|
-f webm_dash_manifest -i audio2.webm \
|
|
-map 0 -map 1 -map 2 -map 3 \
|
|
-c copy \
|
|
-f webm_dash_manifest \
|
|
-adaptation_sets "id=0,streams=0,1 id=1,streams=2,3" \
|
|
manifest.xml
|
|
@end example
|
|
|
|
@section webm_chunk
|
|
|
|
WebM Live Chunk Muxer.
|
|
|
|
This muxer writes out WebM headers and chunks as separate files which can be
|
|
consumed by clients that support WebM Live streams via DASH.
|
|
|
|
@subsection Options
|
|
|
|
This muxer supports the following options:
|
|
|
|
@table @option
|
|
@item chunk_start_index
|
|
Index of the first chunk (defaults to 0).
|
|
|
|
@item header
|
|
Filename of the header where the initialization data will be written.
|
|
|
|
@item audio_chunk_duration
|
|
Duration of each audio chunk in milliseconds (defaults to 5000).
|
|
@end table
|
|
|
|
@subsection Example
|
|
@example
|
|
ffmpeg -f v4l2 -i /dev/video0 \
|
|
-f alsa -i hw:0 \
|
|
-map 0:0 \
|
|
-c:v libvpx-vp9 \
|
|
-s 640x360 -keyint_min 30 -g 30 \
|
|
-f webm_chunk \
|
|
-header webm_live_video_360.hdr \
|
|
-chunk_start_index 1 \
|
|
webm_live_video_360_%d.chk \
|
|
-map 1:0 \
|
|
-c:a libvorbis \
|
|
-b:a 128k \
|
|
-f webm_chunk \
|
|
-header webm_live_audio_128.hdr \
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-chunk_start_index 1 \
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-audio_chunk_duration 1000 \
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webm_live_audio_128_%d.chk
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@end example
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@c man end MUXERS
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