@scharfis,
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if it is yv12, use converttoyuy2(interlaced=true), but do NOT use reinterpolate420()
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You can do that, but it might be better to use 1/2-1/2 upsampling instead of the 3/4-1/4. I will change my plugin so that you can compare it.
About PAL DV YV12:
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PAL always merges two chroma lines together within the PAL-Decoder for better chroma stability -> similar to interlaced YV12
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The advantage is that PAL DV doesn't have this weird chroma placement. It occured to me that this implies that the conversion YV12->YUY2->YV12 (interlaced stuff) is lossless (which is not the case for mpeg1/mpeg2 4:2:0 as we all know).