Hi -
> From: Selva Nair <[EMAIL PROTECTED]>
> But why do you care about top_field first when the source is progressive?
I don't care which order the fields come in - could have been the DV
standard's bottom first and I'd have been just as happy.
> If you use 24000:1001 and pulldown instead of 30000:1001, the encoder will
> keep switching between top_field_first = true/false to generate the
> pulldown sequence.
Now it's my turn to ask why would I want to do a pulldown when I have
~30fps interlaced with is what I wanted all along?
> By progressive if you mean progressive_frame flagged as true, again,
> use 24000:1001 and pulldown you will have it.
But that's precisely what I do not want - or at least I'm fairly
sure I do not need it. I was concerned that progressive IN would
yield progressive OUT and that won't work with DVDs.
> But if you want a progressive sequence the dvd preset wont allow it
> as DVDs are for interlaced displays by design. I think mpeg2enc will
Exactly - so since the encoder will take the generated frames and
split each into two fields as I want why bother with converted film
rates and the pulldown?
> generate progressive sequences with a generic mpeg2 preset plus -I 0.
I wonder if that'll work - have to try it. Of course it'd be for
a small clip since 1280x768 is going to be very slow encoding (~3x
slower than encoding 720x480).
> You have the full 444 chroma info at the ppm stage so isn't it best
> to subsample it directly to 420_mpeg2 from the ppm? Otherwise you go
> through 444 -> 420_jpeg -> 420_mpeg2 -- looks more lossy to me.
Hmmm, possible but I have a feeling that the jpeg->mpeg2 conversion's
"loss" is so small you'd need Golden Eyeballs to notice it ;) Certainly
it'd be a lot less of a loss than the 444 -> xxx conversion.
Now to do what I probably should have done before posting this - get
a cup of coffee :)
Cheers,
Steven Schultz
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