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[Esteban <1226080@xxxxxxxxxxxxxxxxxx>]

I just test this into a clean Fedora 19 (x64) installation.

OpenShot installed by: yum -y install openshot
OpenShot version: 1.4.3

Exact same error happens.
Crash on exporting a movie with an slowed down clip inside.

FFmpeg version on Fedora 19, from ffmpeg -version on console:
ffmpeg version 1.2.2
built on Aug  4 2013 08:24:19 with gcc 4.8.1 (GCC) 20130603 (Red Hat 4.8.1-1)
configuration: --prefix=/usr --bindir=/usr/bin --datadir=/usr/share/ffmpeg --incdir=/usr/include/ffmpeg --libdir=/usr/lib64 --mandir=/usr/share/man --arch=x86_64 --optflags='-O2 -g -pipe -Wall -Wp,-D_FORTIFY_SOURCE=2 -fexceptions -fstack-protector --param=ssp-buffer-size=4 -grecord-gcc-switches -m64 -mtune=generic' --enable-bzlib --disable-crystalhd --enable-frei0r --enable-gnutls --enable-libass --enable-libcelt --enable-libdc1394 --disable-indev=jack --enable-libfreetype --enable-libgsm --enable-libmp3lame --enable-openal --enable-libopencv --enable-libopenjpeg --enable-libopus --enable-libpulse --enable-libschroedinger --enable-libspeex --enable-libtheora --enable-libvorbis --enable-libv4l2 --enable-libvpx --enable-libx264 --enable-libxvid --enable-x11grab --enable-avfilter --enable-postproc --enable-pthreads --disable-static --enable-shared --enable-gpl --disable-debug --disable-stripping --shlibdir=/usr/lib64 --enable-runtime-cpudetect
libavutil      52. 18.100 / 52. 18.100
libavcodec     54. 92.100 / 54. 92.100
libavformat    54. 63.104 / 54. 63.104
libavdevice    54.  3.103 / 54.  3.103
libavfilter     3. 42.103 /  3. 42.103
libswscale      2.  2.100 /  2.  2.100
libswresample   0. 17.102 /  0. 17.102
libpostproc    52.  2.100 / 52.  2.100

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AL - BR, which is subscribed to OpenShot Video Editor.
https://bugs.launchpad.net/bugs/1226080

Title:
  export always crash (slow down track inside project)

Status in OpenShot Video Editor:
  New

Bug description:
  Xubuntu 13.04 64 bits.
  OpenShot 1.4.3 from ubuntu's official repository.

  OpenShot always crash here when i'm trying to export to any format.
  The project has an slowdown video-audio track.

  If i remove that track, the export finishes just fine.
  Put slowed down track back, export crash instantly.

  This is the error i get trought the console:

  python: /build/buildd/libav-extra-0.8.6ubuntu2/libav/libavutil/mathematics.c:79: av_rescale_rnd: Assertion `c > 0' failed.
  Aborted (core dumped)

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