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[Pako <403154@xxxxxxxxxxxxxxxxxx>]

Same here with 1.2.2 in Maverick. when Idle is 22% + 7% for Pulseaudio
and 116 MiB Ram, with 1920x1080p h264 on timeline it goes to 100%

-- 
100% CPU core usage when previewing time-line
https://bugs.launchpad.net/bugs/403154
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Status in OpenShot Video Editor: In Progress

Bug description:
Using complex keyframes can cause the viewing port to freeze so it will not play anymore.

I have tested this with Jonathan's original Vimeo demo clip with the dog and the leaves.

I have attached project .osp file for examination.

I put the clip on the timeline, and set the clip properties so Video had fill enabled.

I then set layout->end->x to 100% so it wiped across the screen

I then duplicated this clip and placed the copy below it, and synchronised.

On the duplicate I set layout->start->x to -100% and layout->end->x to 0% so it wiped across following the upper clip.

At this point in the editing, the timeline would usually play without the viewing window freezing, but sometimes the viewing window would freeze and I would have to close OpenShot and re-start it.

The next thing I did was to switch the sound to "off" on the lower duplicate clip.

With these settings the timeline could not run fully without the viewing port freezing.

Also it had another dramatic effect!

If I re-loaded this saved project at this state, it would sometimes completely hang OpenShot as it tried to load!

Sometimes it would load but without the clips being on the timeline, so only the parent clip showing in the Project Files tab.

Sometimes it would load fully and I could play part of the timeline before the viewer froze.   

Helen McCall