Null pointer reference in ad_liba52.c:62

[rgsteele@…]

I'm running the latest svn on x86_64 Hardy Heron. When attempting to play a video with AC3 encoded audio, mplayer crashes with a segmentation fault at libmpcodecs/ad_liba52.c:62.

62 int c=demux_getc(sh_audio->ds);

(gdb) print sh_audio->ds
$4 = (demux_stream_t *) 0x0

[rgsteele@…]

gdb backtrace

[rgsteele@…]

output of uname -a, ls -l /lib/libc[.-]*, etc.

[rgsteele@…]

Patch

[rgsteele@…]

Working with uau on #mplayerdev I found that running mplayer with "-demuxer lavf" is a workaround for the bug.

I've attached a patch for mplayer.c which seems to fix the bug. Treat it with suspicion -- I really don't know what I'm doing. :)

Note that with either fix the video plays back correctly, but the audio is just intermittent glitches, with a number of errors appearing on the terminal. I'll attach the output for each in case it helps, but I suspect this is a separate issue.

[rgsteele@…]

./mplayer -demuxer lavf /home/ryan/Desktop/HVDVD_TS/FEATURE*EVO > ~/unpatchedmplayeroutputwithlavf.txt 2>&1

[rgsteele@…]

./mplayer /home/ryan/Desktop/HVDVD_TS/FEATURE*EVO > ~/mypatchedmplayeroutput.txt 2>&1

[rgsteele@…]

From ​http://lists.mplayerhq.hu/pipermail/mplayer-dev-eng/2008-May/057536.html:

Thanks, though I think the real bug is elsewhere (in the AVI demuxer
more precisely). Fixed differently in SVN r26908.

Greetings,
Reimar Döffinger