[FFmpeg-devel] [PATCH] avi demuxer breaks on uneven chunk sizes

Michael Niedermayer michaelni
Sat Oct 4 02:07:17 CEST 2008

On Fri, Oct 03, 2008 at 10:47:20PM +0200, elupus wrote:
> Hi,
> Currently the avi demuxer uses the chunk size as given by the stream to
> look for the next chunk. However some muxers (transcode 0.6.9), write
> uneven chunk sizes. 
> I'm not sure if this is actually valid by the specification, but in either
> case the new chunk size should start at a multiple of two bytes from the
> last. So this patch skips one byte before attempting to read next chunk.
> Normally the resync code should take care of the issue, but if you are
> unlucky, it syncs to something invalid, and the output is garbled.

please upload a sample file that needs this and tell us the filename.

Michael     GnuPG fingerprint: 9FF2128B147EF6730BADF133611EC787040B0FAB

Many that live deserve death. And some that die deserve life. Can you give
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even the very wise cannot see all ends. -- Gandalf
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