Please provide a backtrace of the crash. It's quite probably that the issue is indeed FFMpeg related.
IIRC Arch uses a git version of ffmpeg, to have the problem fix you have to update to a snapshot newer than 6 July 2011.
The needed commit is http://git.videolan.org/gitweb.cgi/ffmpeg.git/?a=commit;h=4e59c8ecf1433b85b539c5e89bb68cfe8b8398
Please provide a backtrace of the crash. It's quite probably that the issue is indeed FFMpeg related.
IIRC Arch uses a git version of ffmpeg, to have the problem fix you have to update to a snapshot newer than 6 July 2011.
The needed commit is http:// git.videolan. org/gitweb. cgi/ffmpeg. git/?a= commit; h=4e59c8ecf1433 b85b539c5e89bb6 8cfe8b8398