@@ -18,6 +18,38 @@ enabled muxers.

 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

 Image file muxer.