[FFmpeg-devel] Bug report: decoder errors post-revision 13613

[Michael Niedermayer]

On Mon, Oct 13, 2008 at 11:28:34AM +0100, Andy Parkins wrote:
> Hello,
> 
> With latest SVN ffmpeg I get video corruption when playing from an
> RTSP MPEG4 source.  Like this:
> 
> $ ./ffplay -stats rtsp://1.2.3.4/encoder1
> FFplay version git-dbda489, Copyright (c) 2003-2008 Fabrice Bellard, et al.
>   configuration: --enable-static --disable-shared --enable-pthreads --disable-vhook --enable-extra-warnings --disable-ffmpeg --disable-ffserver --disable-encoders --disable-decoders --disable-muxers --disable-demuxers --disable-parsers --disable-filters --disable-bsfs --disable-devices --enable-decoder=mpeg4 --enable-encoder=mpeg4 --enable-decoder=zlib --enable-muxer=m4v --enable-demuxer=m4v --enable-demuxer=mpegvideo --enable-demuxer=mpegps --enable-demuxer=rm --enable-muxer=mpegts --enable-demuxer=mpegts --enable-demuxer=mpegtsraw --enable-muxer=rtp --enable-demuxer=rtp --enable-demuxer=rtsp --enable-demuxer=sdp --enable-parser=mpeg4video
>   libavutil     49.11. 0 / 49.11. 0
>   libavcodec    52. 0. 0 / 52. 0. 0
>   libavformat   52.22. 1 / 52.22. 1
>   libavdevice   52. 1. 0 / 52. 1. 0
>   built on Oct 13 2008 11:18:36, gcc: 4.2.4 (Debian 4.2.4-3)
> Input #0, rtsp, from 'rtsp://1.2.3.4/encoder1':   0B
>   Duration: N/A, start: -2.-40000, bitrate: N/A
>     Stream #0.0: Video: mpeg4, yuv420p, 720x576 [PAR 1:1 DAR 5:4],  8.33 tb(r)
> Title: RTP session
> [mpeg4 @ 0xa192730]warning: first frame is no keyframe
> [mpeg4 @ 0xa192730]concealing 215 DC, 215 AC, 215 MV errors
> [mpeg4 @ 0xa192730]ac-tex damaged at 39 29
> [mpeg4 @ 0xa192730]Error at MB: 1373
> [mpeg4 @ 0xa192730]ac-tex damaged at 23 30
> [mpeg4 @ 0xa192730]Error at MB: 1403
> [mpeg4 @ 0xa192730]ac-tex damaged at 20 30
> [mpeg4 @ 0xa192730]Error at MB: 1400
> [mpeg4 @ 0xa192730]1. marker bit missing in 3. esc
> [mpeg4 @ 0xa192730]Error at MB: 1404
> [mpeg4 @ 0xa192730]ac-tex damaged at 32 30
> ... etc ...
> 
> I've git-bisected my way to revision 13613 as being the first revision
> where the corruption appears.
> 
> The negative start time shown in stream stats started appearing from
> revision 14045, but I believe that that is unrelated to the corruption.
> 
> I'm sorry I can't offer more information about what is occurring.  I
> can probably create a recording from the source and upload it
> somewhere if that would help.

yes, a file to reproduce it is needed

[...]
-- 
Michael     GnuPG fingerprint: 9FF2128B147EF6730BADF133611EC787040B0FAB

Complexity theory is the science of finding the exact solution to an
approximation. Benchmarking OTOH is finding an approximation of the exact
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