Multicam Timeline Lag / Stutter Issue

[MaynardKrebs]

I am having a bizarre issue. Currently editing a 3 angle multicam sequence on latest version of Premiere (v25.2.0) on an M2 Macbook. I am editing with a drive that only contains my footage as 576p ProRes proxies. All of the footage and audio is on this one drive. 

I have placed my multicam clip into the timeline and it plays smoothly. If, however, I go into multicam mode to switch between angles easily, the playback lags and stutters to a point that it's not really possible to work. One might think that this is a speed issue where my computer for some reason can't handle 3 feeds playing back at the same time, but this does not seem to be the case. If I close out multicam mode and double click on my multicam clip in the timeline, the multicam will open in the Source window. In the Source window, all three angles in the multicam sequence play out flawlessly and smooth. When I playback from the timeline, however, it is still totally choppy and laggy. In fact, every single timeline I try to playback from, even timelines where there are no multicam clips, will be choppy and laggy. The only way to make my timelines play smoothly again is to open up a non-multicam source in the Source window (I have been using an adjustment layer). 

This has obviously really slowed down my workflow. It happens across projects, so there's gotta be some setting I'm missing. Any ideas?

[Sumeet Kumar Choubey]

Hi Drew28761813vmll,

We're sorry to hear about this. Do you have any effects applied to the clips in the timeline? If so, please try temporarily disabling them to see if it improves the playback performance.

Thanks,

Sumeet

[MaynardKrebs]

The only effect applied to the clip is an adjustment layer with a lumetri color s-log conversion LUT. When I disable it, the issue still persists

[PaulMurphy]

To help identify the cause of the multicam timeline lag, could you provide a few more details about your project setup?

• Frame Size and Frame Rate: What are the frame size and frame rate of your original footage, your multicam source sequence, and your final editing sequence?
• Proxy Workflow: Have you imported the proxy files directly into your Project, or are they attached to the original media?
• Original File Specs: If you've attached proxies, what is the original footage's frame size and codec?

This information will help narrow down the potential performance bottlenecks and suggest appropriate optimizations.

[MaynardKrebs]

So my original footage is:

A-Cam:       8192x4320 (the "sequence setting" of the multicam clip matches this)

B&C-Cam:  6144x3240 

The proxies are encoded at

A-Cam:       1365x720

B&C-Cam:  1092x576

The proxies were created by Premiere and attached to the original media. I use a proxy drive and most days do not have the original media connected to my computer.