Originally committed as revision 736 to svn://svn.ffmpeg.org/ffmpeg/trunk
* generic optimization: - enable ALT and ALIGNED stream - move "if(const)" out from loops - supress duplicated computing * first attempt to fix problem with strides Originally committed as revision 734 to svn://svn.ffmpeg.org/ffmpeg/trunk
Originally committed as revision 726 to svn://svn.ffmpeg.org/ffmpeg/trunk