[Ffmpeg-devel] Crash with -vhook

[Michael Niedermayer]

Hi

On Wed, Feb 07, 2007 at 07:47:44PM +0100, Matthijs Douze wrote:
> Hi
> 
> On a Linux box, I run
> 
> ./ffmpeg_g -an -vcodec copy -i x.3gp -vhook vhook/null.so xo.3gp
> 
> and I get:
> 
> -------------> snip
> 
> FFmpeg version SVN-r7868, Copyright (c) 2000-2006 Fabrice Bellard, et al.
>   configuration: 
> --prefix=/scratch2/cornwall/douze/compil/ffmpeg/installed --enable-shared
>   libavutil version: 49.3.0
>   libavcodec version: 51.32.0
>   libavformat version: 51.8.0
>   built on Feb  7 2007 12:50:11, gcc: 3.4.1 (Mandrakelinux 10.1 3.4.1-4mdk)
> 
> Seems stream 0 codec frame rate differs from container frame rate: 29.97 
> (30000/1001) -> 25.00 (25/1)
> Input #0, mov,mp4,m4a,3gp,3g2,mj2, from 'x.3gp':
>   Duration: 00:00:00.8, start: 0.000000, bitrate: 371 kb/s
>   Stream #0.0(und): Video: h263, yuv420p, 176x144, 25.00 fps(r)
> Called with argc=1
> Output #0, 3gp, to 'xo.3gp':
>   Stream #0.0: Video: h263, yuv420p, 176x144, q=2-31, 25.00 fps(c)
> Stream mapping:
>   Stream #0.0 -> #0.0
> Press [q] to stop encoding
> Segmentation fault (core dumped)
> 
> <--------------------- snap
> 
> The file x.3gp is available here:
> 
> http://lear.inrialpes.fr/~douze/ffmpeg_bug/x.3gp
> 
> The bug appears also with an avi file or on a x64 box with gcc 4.1.1. It 
> does not appear if there is no vhook.
> 
> In gdb:
> 
> -----------------------> snip
> (gdb) bt
> #0  0x4050f03c in memcpy () from /lib/tls/libc.so.6
> #1  0x401a613a in ff_img_copy_plane (dst=0x400149e8 "\230I\001@", 
> dst_wrap=0,
>     src=0x1 <Address 0x1 out of bounds>, src_wrap=1075471116, 
> width=135246136,
>     height=88) at imgconvert.c:737
> #2  0x401a630c in img_copy (dst=0x0, src=0x48, pix_fmt=88, width=1077415168,
>     height=1) at imgconvert.c:786
> #3  0x0804b807 in pre_process_video_frame (ist=0x0, picture=0x3baa0c40,
>     bufp=0xbfffeb60) at ffmpeg.c:613
> #4  0x0804d7fe in output_packet (ist=0x0, ist_index=-1073744796,
>     ost_table=0xbffff3f0, nb_ostreams=134547985, pkt=0x80802e0)
>     at ffmpeg.c:1145
> #5  0x08050a11 in av_encode (output_files=0x1, nb_output_files=0,
>     input_files=0x1, nb_input_files=0, stream_maps=0x0,
>     nb_stream_maps=1079775768) at ffmpeg.c:1937
> #6  0x080553e3 in main (argc=9, argv=0xbffff464) at ffmpeg.c:3932
> 
> <----------------------- snap
> 
> Any idea ?

yes vhook + -vcodec copy cannot work, its fundamentally impossible
feel free to send a patch to fix the crash (print error message saying
that vhook + -vcodec copy isnt possible)

[...]

-- 
Michael     GnuPG fingerprint: 9FF2128B147EF6730BADF133611EC787040B0FAB

When the tyrant has disposed of foreign enemies by conquest or treaty, and
there is nothing more to fear from them, then he is always stirring up
some war or other, in order that the people may require a leader. -- Plato
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