the problems with my ffmpeg trunk repo are 'expected', and I never advertised this repo for that reason. PLEASE DO NOT USE IT.
It was just an personnal experiment to test new seeking features of recent ffmpeg. The major problem are major changes in ffmpeg API, this results in 'bad exprerience' in decoding or encoding with some codecs/muxers (mpeg2, svq3 ...) with all programs that are not built against this recent ffmpeg.
To use it in a production machine you will need to recompile every packages that depends on ffmpeg (too much...).
So if you tried it, please downgrade to the regular karmic ffmpeg version.
PS: I will delete ffmpeg-trunk packages, as they are not useful for regular use.
PS edit : @guiodic, your problem with mpeg2 dvd crash is caused the problem described above.