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How does DV 4:1:1 translate to Mpeg 4:2:0

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Devin Crane
How does DV 4:1:1 translate to Mpeg 4:2:0
on Jan 11, 2008 at 12:05:05 am

How does DV 4:1:1 translate to Mpeg 4:2:0? When encoded does it strip the color res down to so that it is actually 4:1:0 or does it covert the color resolution so that it is 4:2:0.


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Daniel Low
Re: How does DV 4:1:1 translate to Mpeg 4:2:0
on Jan 11, 2008 at 1:30:21 pm

Great question Devin.

AFAIC it really comes down to the method and equipment used to do the transcoding. Less sophisticated solutions may not perform any kind of subsampling and as such will produce errors.

Sadly most manufacturers do not make public what methods (linear, nearest neighbour etc) they employ to do this kind of calculation.

Ultimately going from 4:1:1 to 4:2:0 is bad as it will effectively result in 4:1:0. It is better, if possible, to go from 4:1:1 to 4:2:2 (eg DVCPRO50 & DVCPRO HD) and then to 4:2:0.

Those in Europe can rest assured that PAL DV is 4:2:0, the same as MPEG-2, so we don't have to worry about such matters unless we need to deal with NTSC DV!


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