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Add an example showing how to create a video from many images.

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Originally committed as revision 17955 to svn://svn.ffmpeg.org/ffmpeg/trunk
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Stefano Sabatini 2009-03-14 10:18:18 +00:00
parent 786dcfef48
commit c73d39965e
1 changed files with 11 additions and 5 deletions
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doc/ffmpeg-doc.texi
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@ -141,8 +141,9 @@ to get the desired audio language.
NOTE: To see the supported input formats, use @code{ffmpeg -formats}. NOTE: To see the supported input formats, use @code{ffmpeg -formats}.
* You can extract images from a video: * You can extract images from a video, or create a video from many images:
For extracting images from a video:
@example @example
ffmpeg -i foo.avi -r 1 -s WxH -f image2 foo-%03d.jpeg ffmpeg -i foo.avi -r 1 -s WxH -f image2 foo-%03d.jpeg
@end example @end example
@ -151,15 +152,20 @@ This will extract one video frame per second from the video and will
output them in files named @file{foo-001.jpeg}, @file{foo-002.jpeg}, output them in files named @file{foo-001.jpeg}, @file{foo-002.jpeg},
etc. Images will be rescaled to fit the new WxH values. etc. Images will be rescaled to fit the new WxH values.
If you want to extract just a limited number of frames, you can use the
above command in combination with the -vframes or -t option, or in
combination with -ss to start extracting from a certain point in time.
For creating a video from many images:
@example
ffmpeg -f image2 -i foo-%03d.jpeg -r 12 -s WxH foo.avi
@end example
The syntax @code{foo-%03d.jpeg} specifies to use a decimal number The syntax @code{foo-%03d.jpeg} specifies to use a decimal number
composed of three digits padded with zeroes to express the sequence composed of three digits padded with zeroes to express the sequence
number. It is the same syntax supported by the C printf function, but number. It is the same syntax supported by the C printf function, but
only formats accepting a normal integer are suitable. only formats accepting a normal integer are suitable.
If you want to extract just a limited number of frames, you can use the
above command in combination with the -vframes or -t option, or in
combination with -ss to start extracting from a certain point in time.
* You can put many streams of the same type in the output: * You can put many streams of the same type in the output:
@example @example