python2.7 crashed with SIGABRT in __assert_fail_base()

[gtarantino]

using transmagedon (video converter program)

ProblemType: Crash
DistroRelease: Ubuntu 12.04
Package: python2.7-minimal 2.7.3~rc1-1ubuntu2
ProcVersionSignature: Ubuntu 3.2.0-18.29-generic 3.2.9
Uname: Linux 3.2.0-18-generic i686
ApportVersion: 1.94.1-0ubuntu2
Architecture: i386
CrashCounter: 1
Date: Wed Mar 14 22:11:09 2012
ExecutablePath: /usr/bin/python2.7
InstallationMedia: Ubuntu 11.04 "Natty Narwhal" - Release i386 (20110427.1)
ProcCmdline: python transmageddon.py
Signal: 6
SourcePackage: python2.7
StacktraceTop:
 raise () from /lib/i386-linux-gnu/libc.so.6
 abort () from /lib/i386-linux-gnu/libc.so.6
 ?? () from /lib/i386-linux-gnu/libc.so.6
 __assert_fail () from /lib/i386-linux-gnu/libc.so.6
 av_rescale_rnd () from /usr/lib/i386-linux-gnu/i686/cmov/libavutil.so.51
Title: python2.7 crashed with SIGABRT in raise()
UpgradeStatus: Upgraded to precise on 2012-03-13 (1 days ago)
UserGroups: adm admin lpadmin mythtv sambashare

[Apport retracing service (apport)]

StacktraceTop:
 __assert_fail_base (fmt=0x498438 "%s%s%s:%u: %s%sAssertion `%s' failed.\n%n", assertion=0x29bb229 "c > 0", file=0x29bb1a4 "/build/gpocentek-libav-extra_0.8.0.1build1+medibuntu1-i386-H1R4_h/libav-extra-0.8.0.1build1+medibuntu1/libav/libavutil/mathematics.c", line=79, function=0x29bb560 "av_rescale_rnd") at assert.c:94
 __GI___assert_fail (assertion=0x29bb229 "c > 0", file=0x29bb1a4 "/build/gpocentek-libav-extra_0.8.0.1build1+medibuntu1-i386-H1R4_h/libav-extra-0.8.0.1build1+medibuntu1/libav/libavutil/mathematics.c", line=79, function=0x29bb560 "av_rescale_rnd") at assert.c:103
 ?? ()
 gst_ffmpegenc_encode_audio (ffmpegenc=0x0, audio_in=0xb6b18820 "", max_size=16384, timestamp=0, duration=23219954, discont=1, in_size=<optimized out>) at gstffmpegenc.c:867
 gst_ffmpegenc_chain_audio (pad=0xaef340d0, inbuf=0xaefff128) at gstffmpegenc.c:1012