@@ -18,6 +18,7 @@ enabled muxers.

 A description of some of the currently available muxers follows.

+@anchor{crc}

 @section crc

 CRC (Cyclic Redundancy Check) testing format.

@@ -50,6 +51,45 @@ and the input video converted to MPEG-2 video, use the command:

 ffmpeg -i INPUT -acodec pcm_u8 -vcodec mpeg2video -f crc -

 @end example

+See also the @code{framecrc} muxer (@pxref{framecrc}).

+

+@anchor{framecrc}

+@section framecrc

+

+Per-frame CRC (Cyclic Redundancy Check) testing format.

+

+This muxer computes and prints the Adler-32 CRC for each decoded audio

+and video frame. 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 line for each audio and video

+frame of the form: @var{stream_index}, @var{frame_dts},

+@var{frame_size}, 0x@var{CRC}, where @var{CRC} is a hexadecimal

+number 0-padded to 8 digits containing the CRC of the decoded frame.

+

+For example to compute the CRC of each decoded frame in the input, and

+store it in the file @file{out.crc}:

+@example

+ffmpeg -i INPUT -f framecrc out.crc

+@end example

+

+You can print the CRC of each decoded frame to stdout with the command:

+@example

+ffmpeg -i INPUT -f framecrc -

+@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 each decoded input audio frame converted to PCM

+unsigned 8-bit and of each decoded input video frame converted to

+MPEG-2 video, use the command:

+@example

+ffmpeg -i INPUT -acodec pcm_u8 -vcodec mpeg2video -f framecrc -

+@end example

+

+See also the @code{crc} muxer (@pxref{crc}).

+

 @section image2

 Image file muxer.