Commit a4effe43 authored by Stefano Sabatini's avatar Stefano Sabatini Committed by Janne Grunau
Browse files

Add documentation for the crc muxer.

Signed-off-by: default avatarJanne Grunau <>
parent f4acb837
......@@ -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
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
ffmpeg -i INPUT -f crc out.crc
@end example
You can print the CRC to stdout with the command:
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:
ffmpeg -i INPUT -acodec pcm_u8 -vcodec mpeg2video -f crc -
@end example
@section image2
Image file muxer.
Markdown is supported
0% or .
You are about to add 0 people to the discussion. Proceed with caution.
Finish editing this message first!
Please register or to comment