[Kdenlive-devel] Title Widget / Monitor scene speed

[Dan Dennedy]

On Sat, Aug 21, 2010 at 1:27 AM, Simon Eugster <simon.eu at gmail.com> wrote:
> Regarding the title widget, I (as already stated before) vote for a
> rewrite anyways. Perhaps we can get rid of performance problems as
> well then.

First of all, what is "monitor scene?"

Regarding a titler rewrite, I have a couple of suggestions. The window
needs to be more scalable than it is now - it is bigger than my screen
on my laptop. Also, might it be possible to make it as an overlay on
the clip monitor? Then, a tab sheet can contain the tools and other
widgets? Then, eventually, a variant of this tool can be extended as a
way to also use shapes/eye-dropper/wand for defining filter masks and
drawing into the alpha channel.

BTW, in thinking about masks (better term than "region"), I am
thinking about a way to modify MLT to allow one to place special
filters "Set mask" and "Apply mask" onto the filter stack. That way
one could designate one set of filters to apply with a mask, another
set with another mask, and others with no mask. The mask defined in
"Set mask" would be used with all filters below it and above "Apply
mask." And "Apply mask" clears the mask for filters below it until
another "Set mask." When the "Set mask" filter is selected, it could
expose the "mask monitor overlay widget" mentioned above.

Just some thoughts.

> I guess what you mean is that e.g. moving objects has a delay of around 0.2 s?
>
> Simon
>
> 2010/8/19 Till Theato <root at ttill.de>:
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>>
>> Hi,
>> for me both the title widget and the monitor scene are quite slow and
>> hardly usable. They both use QGraphicsView + QGraphicsScene.
>> I remember the title widget being much faster about half a year ago. As
>> on the Kdenlive side monitor scene and titler do not share code (there
>> are similarities now, but the problem existed with monitor scene when it
>> was just a blank qgraphicsscene with a rect) this is probably related to
>> my qt build. I use the Archlinux qt package.
>> Does anyone of you have similar problems or any ideas on how to fix this?
>>
>> regards till
>
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