[MPlayer-dev-eng] Fix when seeking in mpegts using -demuxer lavf

[Reimar Döffinger]

On Thu, Aug 04, 2011 at 10:25:15PM +0200, Etienne Buira wrote:
> On Thu, Aug 04, 2011 at 10:11:34PM +0200, Reimar Döffinger wrote:
> > On Thu, Aug 04, 2011 at 09:36:16PM +0200, Etienne Buira wrote:
> > > Ran into this when playing a mpegts file with -demuxer lavf, r33952 with
> > > ffmpeg 1816addc.
> > > 
> > > A:47387.359 V:47387.615 A-V: -0.255 ct: -0.184   0/  0  6%  0%  0.5% 1 0 
> > > Program received signal SIGSEGV, Segmentation fault.
> > > mp_msp_av_log_callback (ptr=0x16b8ab0, level=24, fmt=0xca1d29 "Continuity Check Failed\n", vl=0x7fffffffb590) at libmpcodecs/vd_ffmpeg.c:201
> > 
> > A backtrace would be useful since this might be a bad av_log call in
> > FFmpeg.
> 
> Can't conveniently make a gdb bt right now. But the call for sure is
> coming from libavformat/mpegts.c:handle_packet(), which has been
> modified in 50815142 (unrelated) from av_log(NULL, ...) to av_log(ts,
> ...).

Seems completely broken or at the very least undesirable to me (e.g.
even after you patch it will break filtering messages by whether the
source is demuxer or decoder - admittedly it is only partially working
right now).
Sent a patch.
I applied this patch to not crash but added code to instead complain.