fixes samples.mplayerhq.hu/flac/Yesterday.ogg
closes issue73

Originally committed as revision 10088 to svn://svn.ffmpeg.org/ffmpeg/trunk

patch by Aurelien Jacobs, aurel gnuage org

Originally committed as revision 9314 to svn://svn.ffmpeg.org/ffmpeg/trunk

and fix GPL/LGPL version mismatches.

Originally committed as revision 6577 to svn://svn.ffmpeg.org/ffmpeg/trunk

Originally committed as revision 5367 to svn://svn.ffmpeg.org/ffmpeg/trunk

Originally committed as revision 4842 to svn://svn.ffmpeg.org/ffmpeg/trunk

Originally committed as revision 4749 to svn://svn.ffmpeg.org/ffmpeg/trunk

changing AVCodecContext codec -> *codec in AVStream so additions to AVCodecContext dont randomize AVStream and break binary compatibility

Originally committed as revision 4453 to svn://svn.ffmpeg.org/ffmpeg/trunk

based on patch by Matthieu Castet <castet dot matthieu at free dot fr>

Originally committed as revision 4220 to svn://svn.ffmpeg.org/ffmpeg/trunk