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Originally Posted by 2Bdecided
YV12 interlaced still keeps the lines from separate fields separate - the "bluring" is within field, not across two fields. That's why YV12 interlaced sampling is defined as subtly different from YV12 progressive sampling.
If it wasn't so, then any movement on a standard interlaced source (never mind this 3D one) would have horrible chroma ghost trails. You sometimes see this when people handle YV12 incorrectly.
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Well, it seems there is a way to convert interlaced material to YV12 properly. But that isn't automatic! It requires a "special" method.
From Wiki:
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With interlaced material, 4:2:0 chroma subsampling can result in motion artifacts if it is implemented the same way as for progressive material. The luma samples are derived from separate time intervals while the chroma samples would be derived from both time intervals. It is this difference that can result in motion artifacts. The MPEG-2 standard allows for an alternate interlaced sampling scheme where 4:2:0 is applied to each field (not both fields at once). This solves the problem of motion artifacts, reduces the vertical chroma resolution by half, and can introduce comb-like artifacts in the image.
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