I appreciate the work done on delinterlacing, however I've had to turn it off because it's not working correctly. The problem is that when turned on, jitter is introduced by the delinterlacing functionality. One way this is evidenced is by the way horizontal crawls, frequently used on news programs, jitters as the text moves from right to left.
IMHO, I believe the problem is caused by the delinterlacing algorithm reversing the field order. I say this because as the author of digital compositing software, I've seen the same artifact when my code inadvertently reversed the field order. I fixed the problem by making sure the field order was correct.