Update qmin/qmax values for libx264 presets
Also allow qmin/qmax to go up to 69 (the current max value for libx264). Thiswill have to increase when we add 9/10-bit support.
Enable mbtree by default, and remove it from presets
Originally committed as revision 22671 to svn://svn.ffmpeg.org/ffmpeg/trunk
Add presets for all of the x264 presets, including fastfirstpass versions.Not 100% accurate, since not all x264 options have ffmpeg equivalents yet.
Patch by Lou Logan.
Originally committed as revision 22144 to svn://svn.ffmpeg.org/ffmpeg/trunk