fixes the random dts/pts during encoding
asf preroll fix
no more initial zero frames for b frame encoding
mpeg-es dts during demuxing fixed
.ffm timestamp scale fixed, ffm is still broken though

Originally committed as revision 3168 to svn://svn.ffmpeg.org/ffmpeg/trunk

Originally committed as revision 3149 to svn://svn.ffmpeg.org/ffmpeg/trunk

Originally committed as revision 2840 to svn://svn.ffmpeg.org/ffmpeg/trunk

Originally committed as revision 2674 to svn://svn.ffmpeg.org/ffmpeg/trunk

Originally committed as revision 2673 to svn://svn.ffmpeg.org/ffmpeg/trunk

Originally committed as revision 2257 to svn://svn.ffmpeg.org/ffmpeg/trunk

Originally committed as revision 2175 to svn://svn.ffmpeg.org/ffmpeg/trunk

Originally committed as revision 2116 to svn://svn.ffmpeg.org/ffmpeg/trunk

suppressed memory leaks - added image conversion support if the codec does not support YUV420P - added raw output (any comments are welcome to simplify the API)

Originally committed as revision 2072 to svn://svn.ffmpeg.org/ffmpeg/trunk

Originally committed as revision 2071 to svn://svn.ffmpeg.org/ffmpeg/trunk

Originally committed as revision 2069 to svn://svn.ffmpeg.org/ffmpeg/trunk