Optical flow using Hybrid -- Possible?

[markfilipak]

A source clip can have flags regarding whether they are interlaced or not, but like the normal interlaced info it often is not reliable.

Oh, it's reliable. But it's useless because it doesn't differentiate NTSC (i.e. 30fps[60sps]) from hard telecined cinema (i.e. 30fps[24pps]). That's why some sort of !combed flag is needed triggered by the 3 frames out of 5 that differentiate hard telecine from NTSC. If such a flag was exposed to ffmpeg user processes, then, after converting to 120fps, mixed NTSC-converted-to-120fps could be made progressive by buffering the bottom field and bobbing the top field for 2 frames. It would be perfect.

I'd like to present some timing diagrams to show you how it works, but this forum application doesn't display plain text properly, even if wrapped in code tags, and the attachments facility doesn't work at all.

PS: Well, it appears attachments do work, they just don't indicate that they are there until you save the reply. Having now saved the reply, I see that the 'anything-to-120fps .txt' attachment is there. When clicked, it doesn't display properly -- lines are wrapped in my browser -- so copying the lines to a plain text editor is required, but at least you can see the methods. Kindly let me know what you think, eh?