[Cin] Multitrack performance issues

[Phyllis Smith]

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 at 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)
>
> --
> Stefan
> --
> Cin mailing list
> Cin at lists.cinelerra-gg.org
> https://lists.cinelerra-gg.org/mailman/listinfo/cin
>
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