FixBrokenChromaUpsampling

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FixBrokenChromaUpsampling(clip clip)

I noticed that the MS DV codec upsamples the chroma channels incorrectly, and I added a FixBrokenChromaUpsampling filter to compensate for it. You should put this after DirectShowSource if you're using the MS DV codec, or if you notice off-color lines appearing in interlaced images.

For each group of 4 lines it swaps the chroma of the middle 2:

frame_old	frame_new
line 1	line 1
line 2	line 3
line 3	line 2
line 4	line 4
line 5	line 5
line 6	line 7
line 7	line 6
line 8	line 8