25fps footage on 23.976 timeline - choppy playback. Help!

[SpiritOnline]

Please help, guys.

Up till now my project included 59.940 fps 1920 x 1080 footage on a 23.976 timeline.

23.976 timeline is chosen to create cimematoc feel. Everything has been smooth even with

lots of time-manipulation do individual clips.

Then new material was shot, some of whcih is 25fps 3840 x 2160, some 100fps 1920 x 1080.

When I play 25fps 3840 x 2160 on the timeline, it plays a bit choppy, not smooth, like

if skipped some frames. The same source files play fine in Premiere's preview window as

well as on an external player. 100fps 1920 x 1080 always play just fine.

All source media files are on SATA SSD, Scratch/cashe on NVME SSD, OS/Program on another

SATA SSD so I don't hink disks have anything to do with it.

Changing Preview resolution makes no difference, same for Proxy - no difference. Also, I transcoded original h.264 to Cineform with same framerate and resolution - no difference!

Why do 25fps 3840 x 2160 files play choppy on my 23.976 timeline? It's driving me

crazy...

[SpiritOnline]

Anyone, please ?

[Michael Grenadier]

try changing the time interpolation in the clip speed/duration diaog to optical flow (select the clip in the timeline and go to clip:  speeed/duration.  Will probably require rendering for smooth playback but can help enormously.

[SpiritOnline · Accepted solution]

Thanks but I've tried that before with no results. 

What fixed is was manually Interpreting Footage and setting it to 23.976 fps, even thought Premiere rounds this value up one digit, playback is now smooth.

But I now wonder if I should always Interpret Footage, even if it looks smooth otherwise? What I wonder is if I interpret 100fps footage as 23.976, will there be still room for significant slowing down or will it consider 100fps as 23.976 and no slow motion will be further possible from there without serious artifacts?

Can anyone answer that, please? 

[Michael Grenadier]

and don't really think usinga 24p sequence is going to give you a noticable difference in "cinematic feel" from 25 fps...  It's noticeable when you're going from 29.97 to 23.976...  particularly if you're going from interlaced to progressive.

[Guest]

Can you show us an example export? 

[Ann Bens]

Based on passed experience; so-called ntsc footage mixing with so-called pal footage is a big pita.

In the timeline it looks ok but when exported...........

[SpiritOnline]

Well, I have no choice but to mix them. Even if I convert time-line to 25fps, the 23.976 footage will have to be converted. What's the workaround? 

Just to be sure - have you seen my reply above where I mentioned about Interpreting Footage fixing the choppy playback?... 

[Ann Bens]

Best is to convert the odd footage in Ae then bring it into Pr.

[doctorsney]

BECAUSE IT"S NOT MEANT TO DO THAT.

Set your timeline to the highest framerate of the footage you're using and make evrything conform to the highest framerate. 

The way you're doing it - it's absolutely correct that Premier is dropping frames to accommodate, your expectation is incorrect. (In the friendliest way buddy, you're tackling this the wrong way)