Rendering does not use full CPU

[Evert Vorster]

Hi there, Farid.

I usually stay out of flame wars, as nothing good comes out of it. However,
one of the complaints against kdenlive is it's slow preview speed on crappy
hardware.

----------------from the war---------------
Kdenlive can't utilize a modern PC's hardware - no matter what you throw at
it - 4 Titans, Threadripper and 128 GB of RAM - it'll be no faster than on
a Core Duo and integrated graphics and 8 GB of RAM. It can't play back
smooth 1080p video even when no effects are used. That's not what you'd
expect from a professional video editing software in 2019.

>
> As we have explained to you before, this is an upstream problem. We are
> trying to internally find a solution but you must know that the project is
> maintained by basically one person most of the time. Welcome to the FLOSS
> reality. If you skim through the issues tracker (
> https://invent.kde.org/kde/kdenlive/issues), you'll see that we are aware
> of your woes and are working to fix them, these things take time, again
> because FLOSS. Do you get it now?
>
----------------end of excerpt----------------
Original poster might be embellishing a bit. I have no problems with 4K
HEVC on my aging i7 with only 24GB of RAM.

But, I feel you may be slightly wrong in saying that this is an upstream
problem and that there is not much we can do about it.
This is not entirely an upstream problem, and there are things that can be
done about it:
To make editing and preview smooth on older hardware and emulators, use
proxies and this neat little trick laid out in:

https://bugs.kde.org/show_bug.cgi?id=369080

It is a bit long-winded, my apologies for that.
In short, to massively improve preview performance, drop the project
resolution. Like, way down, to VGA size..
Once you are ready to encode, bump it up to your desired resolution.

I have asked for JBM to take a look at having the preview resolution tied
to the preview window size, or proxy resolution (I mean, why would you want
to have a higher resolution than the footage that you are playing back, or
the window displaying it), instead of the project resolution, but he is a
busy man and must have forgotten about it.

To speed up render performance, make a kdenlive profile that does hardware
encode. I have had some successes with it, but then again I don't care how
long it takes for something to encode... I walk away from my computer and
go do something else while it is working away.

Kind regards, all.
Thanks for all the hard work you are putting into this wonderful
software... please don't stop!
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