Bug#648843: ffmpeg: segmentation fault when transcoding mkv to mpg

Tue Nov 15 15:30:05 UTC 2011

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From: Eric Cooper <ecc at cmu.edu>
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Package: ffmpeg
Version: 4:0.7.2-1+b1
Severity: normalDear Maintainer,

    $ ffmpeg -i 05\ The\ Rebel\ Flesh.mkv -target ntsc-dvd /tmp/5.mpgffmpeg version 0.7.2-4:0.7.2-1+b1, Copyright (c) 2000-2011 the Libav developers
      built on Oct 27 2011 17:43:14 with gcc 4.6.2
      configuration: --extra-version='4:0.7.2-1+b1' --arch=amd64 --prefix=/usr --libdir=/usr/lib/x86_64-linux-gnu --enable-vdpau --enable-bzlib --enable-libgsm --enable-libschroedinger --enable-libspeex --enable-libtheora --enable-libvorbis --enable-pthreads --enable-zlib --enable-libvpx --enable-runtime-cpudetect --enable-vaapi --enable-libopenjpeg --enable-gpl --enable-postproc --enable-swscale --enable-x11grab --enable-libdirac --enable-libmp3lame --enable-librtmp --enable-libx264 --enable-libxvid --enable-libdc1394 --shlibdir=/usr/lib/x86_64-linux-gnu --enable-shared --disable-static
      libavutil    51.  7. 0 / 51.  7. 0
      libavcodec   53.  5. 0 / 53.  5. 0
      libavformat  53.  2. 0 / 53.  2. 0
      libavdevice  53.  0. 0 / 53.  0. 0
      libavfilter   2.  4. 0 /  2.  4. 0
      libswscale    2.  0. 0 /  2.  0. 0
      libpostproc  52.  0. 0 / 52.  0. 0
    [matroska,webm @ 0x2449500] max_analyze_duration reached
    [matroska,webm @ 0x2449500] Estimating duration from bitrate, this may be inaccurate
    Input #0, matroska,webm, from '05 The Rebel Flesh.mkv':
      Duration: 00:43:18.62, start: 0.000000, bitrate: 384 kb/s
	Stream #0.0: Video: h264 (High), yuv420p, 1280x720, PAR 1:1 DAR 16:9, 25 fps, 25 tbr, 1k tbn, 50 tbc (default)
	Stream #0.1(eng): Audio: ac3, 48000 Hz, 5.1, s16, 384 kb/s (default)
	Stream #0.2(eng): Subtitle: ass (default)
    Incompatible sample format 's16' for codec 'ac3', auto-selecting format 'flt'
    [buffer @ 0x255da00] w:1280 h:720 pixfmt:yuv420p
    [scale @ 0x2563b40] w:1280 h:720 fmt:yuv420p -> w:720 h:480 fmt:yuv420p flags:0x4
    Output #0, dvd, to '/tmp/5.mpg':
      Metadata:
	encoder         : Lavf53.2.0
	Stream #0.0: Video: mpeg2video, yuv420p, 720x480 [PAR 1:1 DAR 3:2], q=2-31, 6000 kb/s, 90k tbn, 29.97 tbc (default)
	Stream #0.1(eng): Audio: ac3, 48000 Hz, 5.1, flt, 448 kb/s (default)
    Stream mapping:
      Stream #0.0 -> #0.0
      Stream #0.1 -> #0.1
    Press ctrl-c to stop encoding
    Input stream #0.1 frame changed from rate:48000 fmt:s16 ch:6 to rate:48000 fmt:flt ch:6
    [dvd @ 0x245f0e0] buffer underflow i=1 bufi=1017 size=1792ate=4010.4kbits/s dup=4777 drop=0    
	Last message repeated 3 times051252kB time=2596.59 bitrate=3316.6kbits/s dup=12904 drop=0    
    Input stream #0.1 frame changed from rate:48000 fmt:flt ch:6 to rate:48000 fmt:flt ch:2
    Warning, using s16 intermediate sample format for resampling
    Segmentation fault

I had first tried the same command with "-threads 6", and it
printed the following before crashing:

    ffmpeg: malloc.c:4631: _int_malloc: Assertion `(unsigned long)(size) >= (unsigned long)(nb)' failed.
    Aborted

Then I tried the one above, in case it was a multi-threading issue,
but that doesn't appear to be the case.

The input .mkv file is 1.1GB; I can upload it somewhere upon request.

-- System Information:
Debian Release: wheezy/sid
  APT prefers testing
  APT policy: (500, 'testing'), (400, 'unstable'), (1, 'experimental')
Architecture: amd64 (x86_64)

Kernel: Linux 3.0.0-1-amd64 (SMP w/8 CPU cores)
Locale: LANG=en_US.UTF-8, LC_CTYPE=en_US.UTF-8 (charmap=UTF-8)
Shell: /bin/sh linked to /bin/dash

Versions of packages ffmpeg depends on:
ii  libavcodec53     4:0.7.2-1+b1
ii  libavdevice53    4:0.7.2-1+b1
ii  libavfilter2     4:0.7.2-1+b1
ii  libavformat53    4:0.7.2-1+b1
ii  libavutil51      4:0.7.2-1+b1
ii  libc6            2.13-21     
ii  libpostproc52    4:0.7.2-1+b1
ii  libsdl1.2debian  1.2.14-6.4  
ii  libswscale2      4:0.7.2-1+b1

ffmpeg recommends no packages.

ffmpeg suggests no packages.

-- no debconf information