convert 1080p to 1080i

[Jan Marijniszoon]

I know the subject must sound crazy, because 1080i is inferior to 1080p, but for pure hobby reasons I would like to know if it is possible to do this?

My guess is that the following steps should be applied:

1. Resize the source from 1080p to 540p
2. Double the framerate, creating fields with one duplicate per field
3. Somehow achieve a vertical shifting between each field
4. Weave the fields to 1080i
5. Instruct the encoder to encode as interlaced
6. Instruct the encoder (or other application like h264info if AVC is used) to apply pulldown resulting in 29,97i frames and 59,94p fields.

I do know how to perform all of these steps aside from step 3. Does someone know if this can be done?

[neuron2]

For 1080p30 -> 1080i30, you can't easily achieve it. You'd be asking to create extra temporal resolution. You could use motion-compensated interpolation, but it would probably look awful.

For 1080p60 -> 1080i30, use this:

separatefields()
selectevery(4,0,3)
weave()

[scharfis_brain]

@neuron2: don't forget to specify the desired fieldorder before applying the re-interlace.

eg.:

AssumeTFF()
SeparateFields().SelectEvery(4, 0, 3).Weave()

[neuron2]

I assume people do obvious things. :)

[rica]

What is gonna be the MeGui settings if i want to re-encode 1080p 24 into a 1080i 24 DXVA x264?

Workflow:
Graph
avs
MeGui

[Jan Marijniszoon]

For 1080p30 -> 1080i30, you can't easily achieve it. You'd be asking to create extra temporal resolution. You could use motion-compensated interpolation, but it would probably look awful.

For 1080p60 -> 1080i30, use this:

separatefields()
selectevery(4,0,3)
weave()

But how do the studio's do it? I red some article that there was made a mistake with the movie Terminator 3 on Blu-ray. They accidently encoded the movie as 1080i.
Terminator 3 is a cinema movie, so it has 24 progressive frames. How does it get encoded as 1080i then?

[neuron2]

Terminator 3 is a cinema movie, so it has 24 progressive frames. How does it get encoded as 1080i then? 3:2 Pulldown, aka telecining.

I read some article that there was made a mistake with the movie Terminator 3

Please give the link to the article. Pulldown is not a "mistake".

[Jan Marijniszoon]

3:2 Pulldown, aka telecining.



Please give the link to the article. Pulldown is not a "mistake".

Here is a link to a review of the 'mistaken' Blu-ray release.

http://bluray.highdefdigest.com/1197/terminator3.html

The most important thing the guy says about the 1080i release is this:

Unfortunately, marring this Blu-ray release is one serious glitch. Due to an encoding error, the disc pumps out 1080i video, not the 1080p indicated on the packaging. Although Warner has suggested that it will eventually correct the problem on future pressings and offer a disc exchange program for those who’ve already bought the disc, this still leaves potential customers in a quandary -- do you buy 'T3' now out of impatience, or wait for the corrected version?

Of course, purist that I am, I'd say wait. But I’ll add that this does make an interesting test case for gauging the difference between a 1080i and 1080p video output using the same source material (albeit on two different high-def formats). Comparing this disc with its HD DVD counterpart, it was clear that, when viewed in its raw 1080i state, jaggies and other motion artifacts were clearly apparent on the Blu-ray. However, once upconverted (either through a Blu-ray player and/or an HD monitor) the truth is that the final on-screen image shows little discernible difference between the two high-def versions of 'T3.' (Sorry, flame me.)

So my best bet would be that this is about a 'hardcoded' pulldown instead of a 'softcoded' pulldown?

[n0mag!c]

So my best bet would be that this is about a 'hardcoded' pulldown instead of a 'softcoded' pulldown?
I don't think they really did it. Having a sample from blu-ray it's easy to compare it with telecined VC-1 stream from HD-DVD.