некотороые норм показывает, а некоторые mkv/mp4 отказываеца воспроизводить, хотя все пакеты для этого стоят.
Could not find GStreamer caps mapping for FFmpeg codec 'h264', and you are using an external libavcodec. This is most likely due to a packaging problem and/or libavcodec having been upgraded to a version that is not compatible with this version of gstreamer-ffmpeg. Make sure your gstreamer-ffmpeg and libavcodec packages come from the same source/repository.
Fedora 17 32bit
yum install gstreamer* ffmpeg* x264*
Done!
vlc открывает без проблем. в F16 работало тож без проблем.