On 04/17/2020 04:25 AM, Ted Park wrote:
Hey,
What do you mean?
split[A] select='not(eq(mod(n+1\,5)\,3))' [C]interleave
[B]split[D]select='eq(mod(n+1\,5)\,2)'[F]blend[D]
[E]select='eq(mod(n+1\,5)\,3)'[G]
I created the filtergraph by hand. I don't know what folks expect, but since duplicating pads
(e.g., "[A] [A]") just takes up space, I didn't duplicate them. I don't know whether that
relates to "reuse filter pad labels". Could you put some 'meat' on your 'bones'?
I meant using D twice.
How would I use D twice? What do you have in mind? Can you draw a picture? I'm
a picture-guy.
I thought it might create a cycle or something but since the first pair of [D]
were linked to each other I guess that means you could use it again for blend's
output pad.
D already is 'blend's output pad.
I'm not really sure how else to put it, I think you might just be missing it
because it's familiar to you. Anyway, it's not that important, but if you look
at each pad in the diagram, D is used as the split filters' output pads before
that, I was just commenting I didn't know you could connect an output pad,
connect it to an input pad and then use the same label again later on.
Ooops! Well, Ted, you see [D] twice because I made a mistake -- I'm juggling several differing
versions simultaneously. Sorry. Here's the actual sketch of the filtergraph:
split[A] select='not(eq(mod(n+1\,5)\,3))' [C]interleave
[B]split[E]select='eq(mod(n+1\,5)\,2)'[G]blend[D]
[F]select='eq(mod(n+1\,5)\,3)'[H]
(Note: I don't take this approach anymore.)
For the actual filter though, should it look better on a 60Hz vertical refresh
panel than 120Hz? I don't fully understand the rationale, but I was curious and
tried it, on film material I can't tell the difference but animation looks
horrible at 120Hz (like I'm dizzy, like a slow motion blur effect at regular
speed?) but it's fine at 60Hz.
A p24-to-p120 is a no brainer: 120/24 = 5, therefore, a simple 5x frame repeat.
But what about folks who don't have 120Hz TVs?
A p24-to-p60 is problematic: 60/24 = 2.5, therefore, a telecine.
A p24-to-p30-to-p60 is a 23 pull-down telecine followed by 2x frame repeat.
It's awful.
A p24-to-p60 55 pull-down telecine is far superior, but players and TVs don't
do that -- at least, MPV and/or my TV don't do it.
Yes, now I understand that it would reduce the stuttering you can get, I didn't
know there were 60Hz display controllers that weren't capable of switching to
48Hz (and 96Hz for 120Hz displays) until recently.
A native 60Hz TV runs at 60Hz (or 60/1.001Hz).
But I don't understand why the same 60fps result looks so much worse when the
refresh rate is set to 120Hz. Maybe it is because I am trying to view the
filtered result in real time instead of writing to disk and playing.
A 120Hz TV will take a 60fps video and convert it to 120fps by simple 2x frame
doubling.
P P P P -- p24
P P P P P P P P P P P P P P P P P P P P -- p24-to-p120
P P P P -- p24
P P C C P -- p24-to-p30
P P P P C C C C P P -- p24-to-p30-to-p60
P P P P P P P P C C C C C C C C P P P P -- p24-to-p30-to-p60-to-p120
P P P P -- p24
P P P P C C P P P P -- p24-to-p60 (55 pull-down)
P P P P P P P P C C C C P P P P P P P P -- p60-to-p120
Compare:
P P P P P P P P P P P P P P P P P P P P -- p24-to-p120 <--best
P P P P P P P P C C C C C C C C P P P P -- p24-to-p30-to-p60-to-p120 <-- worst
P P P P P P P P C C C C P P P P P P P P -- p60-to-p120 <--okay
Does this explain why a p60, 55 telecine viewed on a 120Hz TV would look worse than p24 viewed on a
120Hz TV?
_______________________________________________
ffmpeg-user mailing list
[email protected]
https://ffmpeg.org/mailman/listinfo/ffmpeg-user
To unsubscribe, visit link above, or email
[email protected] with subject "unsubscribe".
