- disarmed other chroma-modes than 420 (temporarily, until all memory
glitches are fixed)
- fixed memory-bugs (writing into memory not owned by the deinterlacer)
by 4:2:0 routines (so this should be running on a Mac ?!) electric-
fence does only moan about *reading* out-off-bounds, now... I'm not
sure how to fix this (and if it's really needed)...
- non-linear intra-field interpolation (which looks better than sinc as
we don't have alias-free source-images ...
- motion-compensation limited to power of 2 for y-axis (avoids some
alias-problems -- and adds flicker, sometimes ... hmm)
