4:1:1 vs 4:2:0 in DV

[shae]

How common is 4:1:1 in DV? Is it only used in PAL DVCPRO?

In what cases might it look better than 4:2:0?

[JohnnyMalaria]

NTSC DV always uses 4:1:1.
PAL DV always uses 4:2:0.

You can't pick and choose. Each has its pros and cons re. image quality.

NTSC and PAL DVCPro use 4:1:1.

[shae]

So it's 4:1:1 for NTSC and any DVCPRO25.

I didn't mean choose, just wondered why 4:1:1 might be preferable. Without actual testing it'd seem to me that 4 horizontal pixels sharing the same chroma would just be too much.

[JohnnyMalaria]

Have a look at http://www.dvformat.com/htm/features/2000/8_00/dv_format_faq.htm#color_sampling

[Blue_MiSfit]

IMO 4:2:0 is preferable, since you don't have to convert when going to MPEG.

~MiSfit

[JohnnyMalaria]

IMO 4:2:0 is preferable, since you don't have to convert when going to MPEG.

~MiSfit

Technically, you should because of the different siting of the subsampled chroma w.r.t. the luma. In reality, it probably doesn't mean much.

[shae]

Have a look at http://www.dvformat.com/htm/features/2000/8_00/dv_format_faq.htm#color_samplingThanks. It's a bit difficult to understand like that what kind of multigeneration errors accumulate or why exactly PAL is different from NTSC in this regard, but okay. :)

[henryho_hk]

In reality, it probably doesn't mean much.

I remember that the vertical "positions" of the chroma samples differ much in the interlaced mode of PAL DV 4:2:0 and MPEG2 4:2:0.