Well, what we did already is a successful transfer from p50 to i25 - edited in Avid, tranfered to DaVinci Resolve (DVR) and therefrom put out at i25.
By our experience, pending on the handling of frame rate conversion in DVR, if you opt for "frame blending" (instead of "nearest / Optical flow) in fact the p50 timeline in an i25 timeline will end upt not psf but frame-blended frame #00 & frame #01 where frame #00 is upper and #01 is lower field (we aren not talking NTSC-DV where fields are reordered from upper to lower field first).
Turning back into Avid: my expectation is: preparing a sequence for the editor, all edits have to be at ":" (not at "." - by Avid lacking displaying a 50 fps TC). -> If there is an edit on "." in a 50 Edit Timebase" we are all fine, however, if you switch that sequnce to "Edit Timebase 25) you are not able to catch the edit done in the 50 fps timeline - it will be one frame ahead or late to the edit you did in the 50 fps timeline. This will phonk your edit for further process.
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Jochen "Jo" Hermann
filter Media Postproduction
Salzburg, Austria
On 7. Oct 2021, at 02:46, John Moore <bigfish@pacbell.net> wrote:Years back I asked how 720P 59.94 was converted into 1080i 59.94. I thought each frame would become a field but that was never confirmed and it was suggested that each 720 frame did not become a field but just every other frame was converted to an interlaced psf. I'm not really sure what happens when 720P is converted to 1080i. If I ask the same question in your 50P/25i world what is the answer there. Does each frame of the 50P become a field? 50P means 50 discrete frames per second, correct? Or is it two Frames from the same moment in time?. I think it's the former not the later but please confirm or correct. Bottom line is if each frame is a unique moment in time no matter which 50P frame you chose there will always be a blended frame. The big draw for 720P for ABC was that it had crisper motion like interlace does.
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