The Ubuntu community has maintained a source tree that backports the VDPAU playback functionality of .22 to version .21. Please enable these patches as an option for those wanting to build low cost mythtv boxes or just plain want a GOOD deinterlacing method.
There is already a bug report for this http://bugs.gentoo.org/show_bug.cgi?id=259009
*** This bug has been marked as a duplicate of bug 259009 ***