"Segmentation fault" when converting from 6 to 2 channels

[Amr Ibrahim]

Note: Bug is reproduced regardless "libavcodec-extra-53" is installed or not

When I issue

ffmpeg -i A.mp4 -ac 2 B.mp4

The result is

ffmpeg version 0.7.2-4:0.7.2-1ubuntu1, Copyright (c) 2000-2011 the Libav developers
  built on Oct 2 2011 15:13:26 with gcc 4.6.1
  configuration: --extra-version='4:0.7.2-1ubuntu1' --arch=amd64 --prefix=/usr --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-gpl --enable-postproc --enable-swscale --enable-x11grab --enable-libdc1394 --enable-shared --disable-static
  WARNING: library configuration mismatch
  avutil configuration: --extra-version='4:0.7.2.1ubuntu1' --arch=amd64 --prefix=/usr --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-libvo-aacenc --enable-version3 --enable-libvo-amrwbenc --enable-version3 --enable-libdc1394 --enable-shared --disable-static
  avcodec configuration: --extra-version='4:0.7.2.1ubuntu1' --arch=amd64 --prefix=/usr --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-libvo-aacenc --enable-version3 --enable-libvo-amrwbenc --enable-version3 --enable-libdc1394 --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
Input #0, mov,mp4,m4a,3gp,3g2,mj2, from 'A.mp4':
  Metadata:
    major_brand : isom
    minor_version : 1
    compatible_brands: isom
    creation_time : 2010-11-18 08:57:45
  Duration: 02:03:57.50, start: 0.000000, bitrate: 2880 kb/s
    Stream #0.0(und): Video: h264 (High), yuv420p, 1280x528 [PAR 1:1 DAR 80:33], 2496 kb/s, 23.98 fps, 23.98 tbr, 24k tbn, 47.95 tbc
    Metadata:
      creation_time : 2010-11-18 08:27:37
    Stream #0.1(und): Audio: aac, 48000 Hz, 5.1, s16, 380 kb/s
    Metadata:
      creation_time : 2010-11-18 08:58:53
[buffer @ 0x1927f60] w:1280 h:528 pixfmt:yuv420p
Output #0, mp4, to 'B.mp4':
  Metadata:
    major_brand : isom
    minor_version : 1
    compatible_brands: isom
    creation_time : 2010-11-18 08:57:45
    encoder : Lavf53.2.0
    Stream #0.0(und): Video: mpeg4, yuv420p, 1280x528 [PAR 1:1 DAR 80:33], q=2-31, 200 kb/s, 24k tbn, 23.98 tbc
    Metadata:
      creation_time : 2010-11-18 08:27:37
    Stream #0.1(und): Audio: libvo_aacenc, 48000 Hz, 2 channels, s16, 64 kb/s
    Metadata:
      creation_time : 2010-11-18 08:58:53
Stream mapping:
  Stream #0.0 -> #0.0
  Stream #0.1 -> #0.1
Press ctrl-c to stop encoding
Segmentation fault

ProblemType: Bug
DistroRelease: Ubuntu 11.10
Package: ffmpeg 4:0.7.2-1ubuntu1
ProcVersionSignature: Ubuntu 3.0.0-14.23-generic 3.0.9
Uname: Linux 3.0.0-14-generic x86_64
ApportVersion: 1.23-0ubuntu4
Architecture: amd64
Date: Mon Dec 26 02:30:07 2011
InstallationMedia: Ubuntu 11.10 "Oneiric Ocelot" - Release amd64 (20111011)
ProcEnviron:
 LANGUAGE=en_GB:en
 PATH=(custom, no user)
 LANG=en_GB.UTF-8
 SHELL=/bin/bash
SourcePackage: libav
UpgradeStatus: No upgrade log present (probably fresh install)

[Reinhard Tartler (siretart)]

In order to investigate this crash further, a stacktrace, and ideally the 6channel input file are required.

[Amr Ibrahim (amribrahim1987)]

I have two problems:
1. How can I get that stacktrace?
2. The input file is 2.5 GB, so I can't attach it directly. I can attach the torrent file (A.torrent) which contains the 6ch video named "The Twilight Saga Eclipse.mp4".

[Reinhard Tartler (siretart)]

On Mo, Dez 26, 2011 at 12:40:51 (CET), Amr Ibrahim wrote:

> I have two problems:
> 1. How can I get that stacktrace?

See https://wiki.ubuntu.com/Backtrace for detailed information.

> 2. The input file is 2.5 GB, so I can't attach it directly. I can
> attach the torrent file (A.torrent) which contains the 6ch video named
> "The Twilight Saga Eclipse.mp4".

Sorry, the .torrent file is not really useful.

Please try to extract a small part of the file that causes the
crash. See the libav debugging instruction for more details (see the
'Submitting Sample Media' section):

http://libav.org/bugreports.html

--
Gruesse/greetings,
Reinhard Tartler, KeyID 945348A4

[Launchpad Janitor (janitor)]

[Expired for libav (Ubuntu) because there has been no activity for 60 days.]