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List:       kde-bugs-dist
Subject:    [kdenlive] [Bug 361360] git master (re-opened) - playback speed/framerate slows WAY down when using 
From:       Jean-Baptiste Mardelle via KDE Bugzilla <bugzilla_noreply () kde ! org>
Date:       2016-07-21 10:13:42
Message-ID: bug-361360-17878-Ueiz3IuDI5 () http ! bugs ! kde ! org/
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https://bugs.kde.org/show_bug.cgi?id=361360

--- Comment #32 from Jean-Baptiste Mardelle <jb@kdenlive.org> ---
Jesse, thanks for the detailed video. On your remote machine where the slowdown
occurs with 2 non transparent clips, can you save the project and open the xml
file to make sure it uses the qtblend transition and not the frei0r.cairoblend?
(just look for the word "qtblend" in the file, if it is there it means it is
used).

Otherwise, the slowdown experienced when compositing 2 titles over a video clip
is what I expected and I see the same behavior on my machine. The situation
will slightly improve when I commit an optimization of MLT's titler module
(currently compositing titles is slightly less efficient than compositing
png's, my optimization should make titles similar to png's performance).

Another possibility is to use the composite transition instead of qtblend.
MLT's composite transition is much faster and supports overlaying 3 title clips
over a video while keeping a 25fps playback rate.

But the drawback of composite is that it has luma bleed (it is fast because it
does some approximations), so for example you can see a small blue border
around green texts... but maybe we could use composite for timeline and switch
to qtblend only for rendering...

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