Workflow workaround for unoptimized preview (preview vs proxy)

[alberto fuentes]

Proxy files are okay to a certain degree, specially early on on the
editing process when bulk editing is done, but they get useless very
soon after a more refine editing needs to be done

Low quality doesnt allow you to see many details that needs to be seen
in order to edit the small stuff... and even when they do, the proxy
slows down too after 1 or 2 effects are applied, even if less

Maybe im missing something and i dont know how to use proxy well, but
I have a very new beefy computer and the clip gets choppy very often,
even with proxy files

Also, switching proxy on and off, invalidates the whole preview...
which makes not wanting to active proxy to begin with

My solution has been to run preview for the whole clip, even if slow,
its done in the background while editing and while im having my lunch
:)

Right now the spacer tool doesnt invalidate the preview as per bug
https://bugs.kde.org/show_bug.cgi?id=367079

But even if you manually invalidate it, its very slow
https://bugs.kde.org/show_bug.cgi?id=384593


MY WORKAROUND is to watch the whole preview and take notes of the
editing that needs to be done. Then, start working on those points
FROM THE END TO THE BEGINING. This way, the spacer tool and moving
things around, wont invalidate previews clips

If you start from begning to end, every little edit that involves
spacing or insert, will invalidate the whole thing



Id like comments on this idea, and hows your own workflow in kdenlive,
because im new to video editing in general and kdenlive in particual,
and maybe im doing something wrong

Thanks for reading!


PS: Also, is it possible to use several threads for preview? I have a
modern i7 with 8 cores and only 1 seems to be working. Since 1 second
chunks are procesed, this seems an easy target for parallelization,
unless last frame preview is needed for the next and I dont know about
it. Not sure if I should open a bug about this or if this new timeline
that is being worked on right now will fix all these problems. A
developer comment would be welcomed :)