fine A-V synchronisation support with either audio or video as master clock...

fine A-V synchronisation support with either audio or video as master clock source - MPEG2 A-V synchronisation fixes - fixed format selection - fixed error reporting - audio and video component selection


git-svn-id: file:///var/local/repositories/ffmpeg/trunk@2106 9553f0bf-9b14-0410-a0b8-cfaf0461ba5b