check quality too, not only md5 (but dont take the scores too serious, the different codecs use different quality/bitrates and its just based on a artificially generated testvideo)
small changes to some test to check a broader area of features


git-svn-id: file:///var/local/repositories/ffmpeg/trunk@1751 9553f0bf-9b14-0410-a0b8-cfaf0461ba5b