[Ffmpeg-devel] mov files cause sigfpe

[Michael Niedermayer]

Hi

On Tue, Sep 06, 2005 at 10:47:46PM +0100, M?ns Rullg?rd wrote:
> Revision 1.86 of mov.c causes a divide by zero in
> av_find_stream_info() when opening many files:
> 
> $ ~/src/ffmpeg/build-vanilla/ffmpeg -i NeroAVC.mp4 
> ffmpeg version CVS, build 3211520, Copyright (c) 2000-2004 Fabrice Bellard
>   configuration:  
>   built on Sep  6 2005 21:48:41, gcc: 3.3.5-20050130 (Gentoo Linux 3.3.5.20050130-r1, ssp-3.3.5.20050130-1, pie-8.7.7.1)
> Floating point exception (core dumped)
> $ gdb ~/src/ffmpeg/build-vanilla/ffmpeg /scratch/core/ffmpeg.3658 
> [...]
> (gdb) bt
> #0  0x08313be0 in __divdi3 (u=0, v=0)
>     at /var/portage/tmp/portage/gcc-3.3.5.20050130-r1/work/gcc-3.3.5/gcc/libgcc2.c:551
> #1  0x08312773 in av_rescale_q (a=0, bq={num = 0, den = 0}, cq=
>       {num = 1, den = 1000000})
>     at /home/mru/src/ffmpeg/vanilla/libavutil/mathematics.c:64
> #2  0x08060bda in av_find_stream_info (ic=0x83ef0a0)
>     at /home/mru/src/ffmpeg/vanilla/libavformat/utils.c:2002
> #3  0x08058ed9 in opt_input_file (filename=0xbfffe8c5 "NeroAVC.mp4")
>     at /home/mru/src/ffmpeg/vanilla/ffmpeg.c:3056
> #4  0x0805ed89 in parse_options (argc=3, argv=0xbfffe6d4, options=0x8315540)
>     at /home/mru/src/ffmpeg/vanilla/cmdutils.c:89
> #5  0x08054870 in main (argc=3, argv=0x1)
>     at /home/mru/src/ffmpeg/vanilla/ffmpeg.c:4506
> 
> The old computation of time_base is obviously flawed, but now it
> doesn't get set at all.  I'm not really sure what the proper way to
> fix this is.
> 
> The NeroAVC.mp4 file is available from
> http://mru.ath.cx/samples/h264/NeroAVC.mp4.

fixed

[...]
-- 
Michael