Premiere Pro export glitches

[ruic10]

Hi everyone, one client has asked me to do a quick job by shortening and cutting a youtube video, which I've downloaded using a youtube to mp4 website and looked fine before I added it to Premiere (the video is his, but he does not have the original file anymore)

Playback is fine, however, I've been getting glitches after exporting a video in h.264 1080p, 25FPS, VBR 1 pass.

This only happens in between the cuts. see image below. It's like the frame glitches into one another and only lasts for one frame.

Tried cutting that frame in premiere (which I don't see in the playback by the way), and doesn't change anything either.

I tried setting my GPU Playback setting to Open CL, Metal and software only, but nothing works. Also, on another note, I have a CUDA driver and I can't see it as a selection.

I'm using Premiere Pro CC 2019

MacBook Pro (Retina, 15-inch, Late 2013)

2.3 GHz Intel Core i7

16 GB 1600 MHz DDR3

NVIDIA GeForce GT 750M 2048 MB

Intel Iris Pro 1536 MB

Any suggestions? Should I change something in my export settings?

[Averdahl]

What happens if you take the downloaded video and add it to Media Encoder and transcode the file to either CineForm or ProRes and then import that file into Premiere Pro and edit that file instead of the .mp4 file?

[Mike Dziennik]

This looks like Optical Flow has been applied to the export. This could have happened on the timeline or on the export settings.

Change the setting shown here to Frame Sampling (if it's not already.) Otherwise right-click on the clip in your sequence and change it there.

[ruic10]

Hi Mike,

I indeed used optical flow in order to smoothen out footage that has been rate stretched on the timeline. Does that mean that I will not be able to use this function because of this? Should I use frame blending or frame sampling instead then?

Will try it out anyways.

Thanks for your tip!

[ruic10]

Hi Averdahl,

trying this now. Will let you know how it goes.

Cheers!

[Mike Dziennik · Accepted solution]

If you use optical flow on a 'pre-cut' sequence then you will always get these artifacts: Premiere doesn't know about the cuts in the clip and so will attempt to smooth the outgoing and incoming frames by blending them together, giving you the result you see.

Optical flow is a fantastic tool when used discerningly - you may wish to use it on certain shots by adding edits and then trimming the incoming and outgoing frames of that shot in order to remove the artifacts.

[ruic10]

I didn't think of that, that's a good point. In any case, that solved my problem! Thanks Mike!!!!

[Joel Baby]

yes, the optical flow was the problem.