[MEncoder-users] mplayer cannot play AC3 anymore

[D Richard Felker III]

On Mon, Mar 28, 2005 at 02:34:10PM +0200, Guillaume Poirier wrote:
> Hi,
> 
> 
> On Mon, 28 Mar 2005 11:58:17 +0200, Stefan Frings
> <mencoder at meinemullemaus.de> wrote:
> > Hi,
> > I just uploaded the first 4MB of one problematic movie. The filename is
> > ac3_crash.mpg
> > 
> > I'm familiar with C programming but I never used the debugger. I think I will
> > learn it in near future.
> > 
> > I followed your debug instructions step by step. This is what I got:
> > 
> > Starting playback...
> > 
> > Program received signal SIGSEGV, Segmentation fault.
> > [Switching to Thread -1221443456 (LWP 22192)]
> > 0xb7e7cdc7 in a52_free () from /usr/local/lib/libavcodec.so
> > (gdb) bt
> > #0  0xb7e7cdc7 in a52_free () from /usr/local/lib/libavcodec.so
> > #1  0xb7e7bd2a in a52_block () from /usr/local/lib/libavcodec.so
> > #2  0x080e2a07 in decode_audio (sh_audio=0x0, buf=0x83bea00 "", minlen=65536,
> 
> Ok, it looks to me that the problem is either in libavcodec or liba52.
> 
>  
> > I cannot follow the next steps because I did not find a core file. Do I need
> > to enable it somewhere?
> 
> Just type "unlimit" on the terminal before starting playback. This
> will allow the system to generate the core file. Please note that this
> file can be fairly huge.
> 
> 
>  
> > I saw that the program crashed in livavcodec.so. I installed ffmpeg-0.4.9-pre1
> > which included the following files. Do you have another version?
> 
> I use ffmpeg for cvs. Somehow, I think that it's not recommended to
> use an external libavcodec.so with MPlayer-cvs, as it can be outdated.
> You should build MPlayer with libavcodec from cvs too.
> You can find more informations at the bottom of that page:
> http://mplayerhq.hu/homepage/design7/dload.html or read this entry of
> the faq: http://www.mplayerhq.hu/DOCS/HTML/en/faq.html#id2883097
> 
> I do think this should fix you problem. If it doesn't, try to
> uninstall ffmpeg if you installed it as package, or try to remove
> libavcodec.so* _before_  configuring and building MPlayer.

The problem is almost certainly that you're linking against
libavcodec.so. DO NOT DO THIS! The liba52 linked with your libavcodec
and the liba52 builtin to mplayer are conflicting and causing the
crash.

Rich