Dan,
thank you very much for your quick reply!
affine is rather slow, but it does support frame-threading if you
enable that.
I've noticed that, but for me it's still good enough; it's an old habit
to use it instead of where a composite would be sufficient too. But this
is an optimization I can stick to in all the projects to come.
My problem here is different as there is a steep degradation exactly at
a certain number of clips composited simultaneously.
First, see if playing the project with melt outside of Kdenlive
exhibits the same problem.
Playing the Kdenlive project with melt shows exactly the same slowdown.
Next, set environment variable MLT_AVFORMAT_PRODUCER_CACHE=10 to see
if that helps with either/both melt or kdenlive.
I first did an "export MLT_AVFORMAT_PRODUCER_CACHE=10", then run melt
again with my Kdenlive project: same slowdown (meltdown?) when reaching
the "critical" section with a certain number of clips simultaneously
composed.
CPU load still is only at max of 18% for my core i7, before and during
this critical section.
Any ideas?
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