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Add documentation for the crc muxer.

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Signed-off-by: Janne Grunau <janne-ffmpeg@jannau.net>
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Stefano Sabatini 2011-01-31 15:20:09 +01:00 committed by Janne Grunau
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doc/muxers.texi
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@ -18,6 +18,38 @@ enabled muxers.
A description of some of the currently available muxers follows. A description of some of the currently available muxers follows.
@section crc
CRC (Cyclic Redundancy Check) testing format.
This muxer computes and prints the Adler-32 CRC 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
CRC.
The output of the muxer consists of a single line of the form:
CRC=0x@var{CRC}, where @var{CRC} is a hexadecimal number 0-padded to
8 digits containing the CRC for all the decoded input frames.
For example to compute the CRC of the input, and store it in the file
@file{out.crc}:
@example
ffmpeg -i INPUT -f crc out.crc
@end example
You can print the CRC to stdout with the command:
@example
ffmpeg -i INPUT -f crc -
@end example
You can select the output format of each frame with @file{ffmpeg} by
specifying the audio and video codec and format. For example to
compute the CRC of the input audio converted to PCM unsigned 8-bit
and the input video converted to MPEG-2 video, use the command:
@example
ffmpeg -i INPUT -acodec pcm_u8 -vcodec mpeg2video -f crc -
@end example
@section image2 @section image2
Image file muxer. Image file muxer.