24p -> 30p?

[Beowulf]

I've got a sexy 23.976 progressive music video.

I want to convert the frame rate to 29.970, keep it in synch, and keep it progressive.

Can this be done?

The reason for this is because I'm making a reel out of some of my music videos, and most of them are in 29.970 progressive, so this one needs to be the same.

Help

[Emotive]

When using multiple sources, I'd usually just add assumefps(29.97) to my avisynth script. Unless you're aware of this and it produces some sort of undesired result for you? It may be a simple method but I've never had any problems with using it, unless you're wanting to use the the source in question with its sound.

[mirkosp]

What Emotive said will be fine if you don't mind footage speed up (audio sync wouldn't be a problem if you add sync_audio=true, but that would get sped up too). Otherwise, here are other solutions:

Code: Select all

changefps(30000,1001)

Since a frame is doubled every 4, the motion will stutter - this will be especially noticeable on pans or scenes with all unique frames. An alternative solution could be decimating your 29.97 footage to 23.976 if you wish, but technically the best thing to do... I think it would be to edit at 60 or 120 fps and then letting avisynth output timecodes and encoding as a vfr mkv.

EDIT: I'll also through in there a potential frame interpolation with twixtor or whatever, though it tends to look bad with anime. If you're using CG or LA, though, it should look pretty good.

(Also, I left out frame blending with convertfps because it just looks ugly... but it's another solution.)

[Emotive]

What Emotive said will be fine if you don't mind footage speed up (audio sync wouldn't be a problem if you add sync_audio=true, but that would get sped up too).

A small manipulation in the footage is innevitable when changing frame rates in any way, otherwise one could just import the 24 fps file to the 29.97 fps project. Right?

[mirkosp]

What Emotive said will be fine if you don't mind footage speed up (audio sync wouldn't be a problem if you add sync_audio=true, but that would get sped up too).

A small manipulation in the footage is innevitable when changing frame rates in any way, otherwise one could just import the 24 fps file to the 29.97 fps project. Right?

Yes, and the NLE would handle the frame blending or frame duplication. Which wouldn't be as reliable as avisynth's handling of it.

Of course, this is all if you can't go the VFR route. That way there actually is no need to change the frame rate to begin with...

[Castor Troy]

If you use Premiere Pro, you can adjust the framerate on the fly with no issues.

[Qyot27]

The easiest way? Make the DVD (if it's going onto DVD) a hybrid. If professionally authored discs can switch between pulldowned 23.976 and interlaced - or straight progressive - 29.97, then it's certainly possible. I have no clue how to go about doing it inside a single title (as I doubt simply concatenating the output would work), but if it doesn't have to go into one titleset you can easily just throw it on a separate track and be done with it. Standalone DVD players don't care if you switch from progressive 29.97 to pulldowned anything (23.976->29.97, 25->29.97, etc.). Most MPEG-2 encoding apps worth their salt automatically default to pulldown if the source is 23.976 anyway.

Otherwise, physical frame duplication, speed-up/slowdown, VFR, decimation, or so on is pretty much the only solution.