[FFmpeg-user] segfault in ffmpeg when including yadif in chain

[Misha Penkov]

On 7 August 2012 19:17, Nicolas George <nicolas.george at normalesup.org> wrote:
> Le primidi 21 thermidor, an CCXX, Misha Penkov a écrit :
>> Hi,
>>
>> I'm trying to deinterlace a 1440x1080 interlaced video.
>> Unfortunately, the ffmpeg executable segfaults:
>>
>> $ ~/git-ext/ffmpeg/ffmpeg -i 1440x1080i.avi -vf yadif -y output.avi
>> ffmpeg version N-43291-gcf753d5 Copyright (c) 2000-2012 the FFmpeg developers
>>   built on Aug  7 2012 19:06:29 with gcc 4.4.3 (Ubuntu 4.4.3-4ubuntu5.1)
>>   configuration: --enable-gpl --enable-libfaac --enable-libmp3lame
>> --enable-libopencore-amrnb --enable-libopencore-amrwb
>> --enable-libtheora --enable-libvorbis --enable-libx264
>> --enable-nonfree --enable-postproc --enable-version3 --enable-x11grab
>> --enable-libvpx --enable-shared --enable-pic --enable-libopencv
>>   libavutil      51. 66.101 / 51. 65.100
>>   libavcodec     54. 50.100 / 54. 44.100
>>   libavformat    54. 22.101 / 54. 19.100
>>   libavdevice    54.  2.100 / 54.  2.100
>>   libavfilter     3.  5.102 /  3.  3.100
>>   libswscale      2.  1.101 /  2.  1.100
>>   libswresample   0. 15.100 /  0. 15.100
>>   libpostproc    52.  0.100 / 52.  0.100
>> Input #0, avi, from '1440x1080i.avi':
>>   Metadata:
>>     encoder         : Lavf54.19.100
>>   Duration: 00:00:09.99, start: 0.000000, bitrate: 13775 kb/s
>>     Stream #0:0: Video: mpeg2video (Main) (mpg2 / 0x3267706D),
>> yuv420p, 1440x1080 [SAR 4:3 DAR 16:9], 24000 kb/s, 59.94 fps, 29.97
>> tbr, 59.94 tbn, 59.94 tbc
>> Output #0, avi, to 'output.avi':
>>   Metadata:
>>     ISFT            : Lavf54.19.100
>>     Stream #0:0: Video: mpeg4 (FMP4 / 0x34504D46), yuv420p, 1440x1080
>> [SAR 4:3 DAR 16:9], q=2-31, 200 kb/s, 29.97 tbn, 29.97 tbc
>> Stream mapping:
>>   Stream #0:0 -> #0:0 (mpeg2video -> mpeg4)
>> Press [q] to stop, [?] for help
>> Segmentation fault
>>
>> What could be the problem?
>
> Unfortunately, more or less anything. Does it segfault too with "-f null -"

yes

> instead of "output.avi"? Can you produce a valgrind dump (using ffmpeg_g
> rather than ffmpeg), and/or a gdb backtrace?

I ran a ffmpeg_g, but it did not output anything.  Is there anything
else I have to do to get a dump?

>
>> The video is approx. 17MB, so I can provide it if required.
>
> Unless you manage to reproduce the segfault with readily available material
> or purely internal features, that would be nice. The simplest way is
> probably to see if you can reproduce the problem with only the first few
> megabytes of the file, and attach it to a trac ticket.

This is the link to the first 3 seconds of the video:

https://dl.dropbox.com/u/15815235/1440x1080i.avi

Cheers,
Misha

>
> Regards,
>
> --
>   Nicolas George
>
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