scaletempo: add hack for smoother speed changes.

git-svn-id: svn://svn.mplayerhq.hu/mplayer/trunk@37204 b3059339-0415-0410-9bf9-f77b7e298cf2
Support FFmpeg's native Opus decoder.

git-svn-id: svn://svn.mplayerhq.hu/mplayer/trunk@37205 b3059339-0415-0410-9bf9-f77b7e298cf2