[Ffmpeg-devel] random crashes decoding MP3s

[Måns Rullgård]

Jacob Meuser <jakemsr at jakemsr.com> writes:

> On Fri, Mar 31, 2006 at 11:33:09AM -0800, Jacob Meuser wrote:
>> On Fri, Mar 31, 2006 at 08:28:12PM +0100, M?ns Rullg?rd wrote:
>> > Jacob Meuser <jakemsr at jakemsr.com> writes:
>> > 
>> > > hola,
>> > >
>> > > I'm seeing occasional random crashes decoding VBR MP3s to WAV, ie:
>> > >
>> > > $ ffmpeg file_vbr.mp3 file.wav
>> > >
>> > > this is from FFmpeg CVS as of about 9 hours ago on OpenBSD
>> > > -current.  I also see the crashes with FFmpeg CVS from 03/21/06.
>> > [...]
>> > > what seems most strange is that the crashes are random.  often
>> > > just running the process a second time works.  I'm decoding several
>> > > MP3 files.  ffmpeg crashes about 20% of the time.  the backtrace
>> > > looks very similar every time (ie, huffman_decode() is always #0).
>> > 
>> > This could be bad memory.  Do you have any other random crashes, like
>> > GCC segfaulting or so?  Run a memory checker like memtest86, and check
>> > your cabling.
>> 
>> hmmm.  I haven't seen anything else go wonky, but of course sh*t
>> happens when you least expect it (and can least afford it :().
>> 
>> I'll try memtest86 and report back in a while.
>
> I only let it go for 1.2 passes but no errors.
>
> I realized I had always been building FFmpeg with CFLAGS+=-g, so I
> tried without.  still crashed in huffman_decode(), but I got through
> a lot more files before it happened.

FFmpeg is built with -g by default to that shouldn't make a
difference.

> also, the crashes do not happen with FFmpeg CVS from 04/13/2005.

Make sure you have a clean build of ffmpeg (make clean; make).

Does this happen with all files?  If not, upload a sample somewhere.

-- 
M?ns Rullg?rd
mru at inprovide.com