So I have never had this issue before but I am having issues with choppy footage after export. It's a wedding video with multiple shots including some drone footage. The drone footage and majority of other shots from my a7siii are 23.97 frame rate, with the exception of a few 60 fps shots from the a7siii.
The playback within premiere pro is completely fine, no issues with lag at all. However, once exported everything plays as expected other than the drone shots - they are lagging pretty heavily - and it's exclusively the drone shots. Any ideas why it's doing this? I have tried increasing my export bitrate - all the way up to 50 VBR 2 pass and it does nothing at all.
I have also did the typical clearing of the cache, restarting the computer, tried exporting via media encoder etc.
Some extra info:
most shots are 4k and I scale them down to 1080p in the sequence (I like being able to zoom in on some shots with preserved quality, and my clients typically don't need 4k - yet).
Use MediaInfo to check out those drone recordings, they could be Variable Frame Rate.
Heard some drone recordings (specifically DJI) can change to VFR instead of CFR to prevent full recording stops. Frames are dropping so it makes VFR files where it can to keep recording, but there are dropouts due to a low write-speed of the SD card.