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HD field dominance clear-up
Hi all,
I am working on an online that was started by someone else. never fun 🙂
I am at the stage of adding titles supers and credits and notice that render times were abnormally long.
I’m using the chv credits v4.1 generator to generate the credits.
After some investigation I have found that the sequence setting had upper(odd) set in the field dominance. It was my understanding that hd footage (from HDCAM 50i captured via Kona 3 to 1080i25 prores 422(HQ)) has a field dominance of none.When i change this setting to ‘none’ my render times half.
but when i right click->item properties->format the clips field dominance is upper (odd).looking into the capture setting it was captured using the aja kona3 standard setting it is capturing with interlaced ticked and top field first.
So in summary,
Am i ok setting the sequence setting field dominance to none if my footage has upper ( it doesn’t need any rendering for clean footage when i do this)?
Am i affecting the quality of the picture by doing this?
Is the interlaced capture preset normal/correct or wrong?thanks
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2 Replies
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after I stopped panicking and got an extra day extension on the project I searched the cow for field dominance and found lots of stuff. (as of course I should have done first)
so hdcam 50i footage is 25p (or psf)
i need to change the field dominance of the sequence and the clip to none to get proper 1080p25
correct?
one question still:
would the mixing of sequence and clip field dominance be bad? it seems like it should but it doesn’t ask for rendering and rendered things look fine.thanks
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Hi Donal,
This can be a bit messi.
When we talf about “fps” that means FRAMES per seconnd.
No FIels per second.
So in purity “i50ps” it doest exist. When we, often, write “i50” we are meaning “i25fps”.
That means 50 interlaced fields per second.
50 interlaced frames per second would mean 100 fields per second.
You should edit that in a 25 Fps, Upper first sequence. If you want to edit in Progressive, you have to de-interlace the footage.[Donal O Kane] “so hdcam 50i footage is 25p (or psf) “
So this is no possible. If is “i” can not be “p”.Cheer,
Rafael
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