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doc: update ffmpeg -ar and -ac documentation to reflect reality.

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Anton Khirnov 2011-06-24 11:22:15 +02:00
parent 20f9f21fd4
commit a58db9d283
1 changed files with 8 additions and 8 deletions
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doc/ffmpeg.texi
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@ -551,19 +551,19 @@ The timestamps must be specified in ascending order.
@item -aframes @var{number}
Set the number of audio frames to record.
@item -ar @var{freq}
Set the audio sampling frequency. For input streams it is set by
default to 44100 Hz, for output streams it is set by default to the
frequency of the input stream. If the input file has audio streams
with different frequencies, the behaviour is undefined.
Set the audio sampling frequency. For output streams it is set by
default to the frequency of the corresponding input stream. For input
streams this option only makes sense for audio grabbing devices and raw
demuxers and is mapped to the corresponding demuxer options.
@item -ab @var{bitrate}
Set the audio bitrate in bit/s (default = 64k).
@item -aq @var{q}
Set the audio quality (codec-specific, VBR).
@item -ac @var{channels}
Set the number of audio channels. For input streams it is set by
default to 1, for output streams it is set by default to the same
number of audio channels in input. If the input file has audio streams
with different channel count, the behaviour is undefined.
Set the number of audio channels. For output streams it is set by
default to the number of input audio channels. For input streams
this option only makes sense for audio grabbing devices and raw demuxers
and is mapped to the corresponding demuxer options.
@item -an
Disable audio recording.
@item -acodec @var{codec}