Ed Colmar wrote:
Replying to myself here, since I did not get any from the list. I'll
simplify my question.
What is the best codec/file format to use when slicing video footage
into smaller resolutions, which will then get loaded back into
cinelerra for editing?
I have been going down the list of formats and just by trial and error
trying to find one that works for me, but I'd love some guidance.
Cheers
-e-
Component Y'CbCrA 8-bit 4:4:4:4 in a Quicktime container with twos
complement audio is the only working uncompressed format which correctly
stores alpha information. I found that after exhaustive (exhausting!)
testing 9 months ago so things may have changed. It is a good choice if
you're playing around with alpha effects such as masks, chromakey etc.
The bandwidth on a PAL full screen video is about 41MB sec! I'm not
sure about its performance in terms of compositor playback because I
haven't played with it for a while.
If you don't need alpha info I would start by trying out something like
Component YCbCr 8-bit 4:2:2, again in a Quicktime container.
Straight DV export is working well and is not heavily compressed, with
no alpha. Most people around here seem to put it in a Quicktime
container. This may be a legacy of the long period of time when
straight DV export wasn't working.
You could also try TIFF or PNG sequences for a non compressed format
(although alpha doesn't work properly last time I checked). Bear in
mind that if you don't select a container format (such as Quicktime of
avi) then you produce a folder of images which is not fully portable.
The text list of TIFF or PNG images in the folder uses absolute file
paths. It needs to be recreated if you move your image directory.
If you want to accept some compression for bandwidth reasons then why
not Ogg /Theora...
Hopefully thats helpful. Feel free to feed your own discoveries back
into the list. Best of luck...
Graham E.
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