Causes and countermeasures for extremely slow operation in multicam editing


If you do multicam editing, the operation will be extremely bad. What could be the reason? Are there any countermeasures?


Although it depends on the specific operation method when the operation is slow and the specifications of the PC, the general possible causes and countermeasures are as follows.
I can come up with other methods as a countermeasure, but I have described what seems to be particularly effective in "multicam editing". If you know of a better way, let us know in the comments.


If this phenomenon occurs in multicam editing, it may be caused by playing multiple videos at the same time.
(It's natural because it's multicam editing...) This issue can occur with the paid version or Mac, depending on the PC specs, but especially when the free version is used in the Windows environment. I think it will be noticeable.
When using the free version in a Windows environment, there is a restriction that the GPU cannot be used for H.264/H.265 hardware decoding processing, so this is especially true when playing multiple simultaneous clips such as multicam clips. influence tends to be stronger.


1. Create optimized media or proxy media

Create an edit-only file that can be edited lightly, and operate it on the timeline when editing.
It takes time to generate files for editing.

The steps below describe how to create optimized or proxy media after you have already created your multicam clips, but you can also create optimized or proxy media before creating your multicam clips.

Select the clip to use from "Multicam Clips" in the media pool, right-click and select "Generate Optimized Media" or "Generate Proxy Media"

[Play]-[Use optimized media if available] or [Use proxy media if available] is checked.

It looks the same, but this allows you to work with alternate files, making playback lighter while editing.

Be careful when delivering. If <Advanced Settings> can be selected, such as when "Custom" is selected on the Deliver page, check the "Use Optimized Media" and "Use Proxy Media" checkboxes. If checked, the final file will be based on optimized or proxy media, resulting in lower quality. If unchecked, the final file will be created from the original data.

2. Clip switching operation without displaying the multicam view

This is a method to restrict playback to only one timeline view even during multicam editing.
I don't think there is much impact unless you play multiple simultaneous views in multicam views, but eliminating operations in multicam views will minimize the impact of slowness due to GPU limitations. With this method, you can't compare multiple angles at the same time, but I think it's less stressful when editing if you can comfortably see one by one in one view rather than comparing with a high load.

When editing using multiclip, you can select clips to be placed on the timeline from the multiclip without displaying the multicam view.

The viewer mode can be changed with the square icon under the inspector on the top right of the screen.

You can change the selection of the clip to be adopted from the multicam by right-clicking the multiclip on the timeline and selecting "Change angle of multicam clip". The shortcut is "Alt+(angle number)" (eg Alt+5).

There may be times when you want to switch between video and audio separately. In that case, select the clip while pressing "Alt" when selecting the clip. This allows you to select video and audio without linking them.

Put a cut on the multicam clip placed on the timeline with a suitable blade, switch it with a shortcut and check it, and edit the cut position that will be the edit point by dragging on the timeline, even without displaying the multi view. I think it's fine in most cases.

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