Correct way to output 1080p footage to retain full quality?

L

lipslide

Active member
Hi Guys,

I did do a search but was inundated with many threads that consisted of people being told that it 1080p really is progressive frames even though it's within an interlaced stream. I failed to find exactly what I was looking for, but apologise in advance if my search skills were lacking.

I've shot almost exclusively in 720p since I bought my HVX and have only just taken on a job in which I can utilise the 1080i/25p capabilities of the camera. It looks great, however, I am concerned about how I should be outputting the footage once I have edited it. The job is a cinema commercial, so the delivery format is 1920x1080 lossless quicktime at 24 or 25 progressive frames (in a non-interlaced stream. I need to get to true 1080p).

My question, however, is this. When I render out from after effects should I be rendering out with the lower field first interlacing to preserve the original quality and then performing a de-interlace with compressor? Or will leaving the 'field render off' not affect the quality of the final render and dutifully combine the fields into a true and complete progressive frame?

I am just concerned that leaving field render off is only taking one field of each frame and duplicating it. I have compared the results and the lower field first does seem to resolve more detail. However de-interlacing in compressor using the best settings visibly degrades the quality.

I would be eternally grateful if somebody could help me with some information on how best to merge these two identical fields.

Thanks in advance. . .
 
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Seriously there's no body out there that has any light they can shed on this? It's not a noob kind of question is it, that people are just ignoring?

Has anybody ever prepared 1080i/25p footage for a film out? Wouldn't the workflow be similar?

I'm really stuck on this one. . .
 
If it's being transfered to film, then you'd want to render out as progressive, not as any kind of interlaced. And do NOT try to DEinterlace it -- it doesn't need it and you only kill your resolution that way.
 
Thank you David, much appreciated. :)

I was under the impression that since it was in an interlaced stream and there were still two seperate fields that it had to be de-interlaced. Thanks for clearing that up, I was beginning to think I might never get an answer.
 
There technically are separate fields, but they're made from the same frame, so you won't see any interlace artifacts.
 
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