Stefan, in looking at the performance improvements you outlined below, this one is really a HUGE improvement:

- modifying the "stacked video" (opacity 100%) to disable "Play track" in the patchbay for the tracks that you do not need to see is the winner. I will add that to the Performance Tips section of the manual. It is a great tip for any computer, not just the smaller ones.

But in my tests "for a disabled video effect, the CPU still runs", I did not see this happening using the "top" command. It seemed to make a nice difference in lowering the cpu when I disabled the plugin. Maybe it is just the plugin I used? Burning Tv? I will try some different ones. Also I did not verify that colourspace made no difference, but I am sure you are right about that.

Thanks for this tip that we can pass along to other users via the manual. ...Phyllis

On Mon, Jul 22, 2024 at 3:26 AM Stefan de Konink via Cin <cin@lists.cinelerra-gg.org> wrote:

I think have a significant opportunity to improve the Cinerella
performance, under normal editing conditions, by n_videotracks-fold. At
this point in time I notice that the CPU usage (decoding) for a section
where multiple tracks are stacked, but only the top one is actually on
screen (read opacity 100%) could be improved.

I observe the following:

- for a disabled video effect, the CPU still runs
- for stacked video, the CPU still runs for both videos
- the effect must be detached and the video below must have play track
disabled to prevent the CPU to go from 20% to 150%
- this is independent of colourspace (RGB, RGBA, YUV or YUVA)

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Stefan
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