On 15/07/2025 16.04, Paul B Mahol wrote:
On Tue, Jul 15, 2025 at 7:57 PM Mark Filipak <markfilipak.i...@gmail.com>
wrote:
On 15/07/2025 15.40, Paul B Mahol wrote:
On Tue, Jul 15, 2025 at 7:34 PM Mark Filipak <markfilipak.i...@gmail.com
wrote:
KEY:
¤ —— Element exists in the field and is sampled
• —— Element exists in the field but is not sampled
—— (blank) Element doesn't exist in the field
>>>> Y element, pixels 0..3
/ Cb element, pixels 0..3
/ / Cr element, pixels 0..3
/ / /
4:4:1 ¤¤¤¤ ¤¤¤¤ ¤¤¤¤ —— lines in field 0
¤¤¤¤ ¤••• ¤••• —— lines in field 1
4:2:1 ¤¤¤¤ ¤•¤• ¤•¤•
¤¤¤¤ ¤••• ¤•••
Well, Paul, you're the expert. Are those two correct? If they are, then I'm
right about
how the tokens work and the folks at wikipedia are wrong. I don't care whether
the
wikipedia folks are right or wrong because I don't pay wikipedia any mind
because I
think wikipedia is a train wreck. I want to be right because I want to be
knowledgeable
so I can help myself and so I can help other people.
Not that you were on any hook, Paul, but I'm letting you off the hook. Of course you don't know
whether my 4:4:1 and-or 4:2:1 are correct because you don't have any experience with such odd
subsample formats. But I think I know how to get an answer.
If you or anyone has a pro authoring tool and can create a video, any video, maybe 2 or 3 seconds,
with 4:2:1 subsampling, I'll examine it and find out what's what.
It's me versus wikipedia. I think I'm right about how to interpret subsample format. There's two
reasons why I think I'm right. 1, I have a solution but wikipedia doesn't -- they say "except in
rare irregular cases like 4:4:1 and 4:2:1, which do not follow this [their] convention". And 2, my
solution works as well as theirs for the other subsample formats.
So, what do you say? Can you or anyone make such a 2 or 3 second video and send
it to me?
--Mark.
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