Commit 8d36d36e authored by Stefano Sabatini's avatar Stefano Sabatini
Browse files

Add to the ffmpeg docs an usage example showing how to extract images

from a video.

Originally committed as revision 14711 to svn://svn.ffmpeg.org/ffmpeg/trunk
parent 6819af82
......@@ -140,6 +140,25 @@ The mapping is particularly useful for DVD transcoding
to get the desired audio language.
NOTE: To see the supported input formats, use @code{ffmpeg -formats}.
* You can extract images from a video:
@example
ffmpeg -i foo.avi -r 1 -s WxH -f image2 foo-%03d.jpeg
@end example
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},
etc. Images will be rescaled to fit the new WxH values.
The syntax @code{foo-%03d.jpeg} specifies to use a decimal number
composed of three digits padded with zeroes to express the sequence
number. It is the same syntax supported by the C printf function, but
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.
@c man end
@chapter Invocation
......
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