support AVOptions for encoding in ffmpeg.c

Originally committed as revision 4580 to svn://svn.ffmpeg.org/ffmpeg/trunk

Originally committed as revision 3853 to svn://svn.ffmpeg.org/ffmpeg/trunk

Originally committed as revision 3822 to svn://svn.ffmpeg.org/ffmpeg/trunk

Originally committed as revision 3601 to svn://svn.ffmpeg.org/ffmpeg/trunk

Originally committed as revision 3092 to svn://svn.ffmpeg.org/ffmpeg/trunk

(f)printf() is disallowed in libavcodec, compilation will fail now if its used, except that codecs which where added after the printf->av_log change which did ignore av_log() and used prinf are now silent and wont print anything, they should be changed to use av_log, i could do that, but its better if the orginal developer decides which AV_LOG level each message should get

Originally committed as revision 2806 to svn://svn.ffmpeg.org/ffmpeg/trunk

Originally committed as revision 2143 to svn://svn.ffmpeg.org/ffmpeg/trunk

Originally committed as revision 1936 to svn://svn.ffmpeg.org/ffmpeg/trunk