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doc/muxers.texi
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A description of some of the currently available muxers follows.
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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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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 @file{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 -acodec pcm_u8 -vcodec mpeg2video -f crc -
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@end example
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@section image2
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Image file muxer.

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