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[Olivier Girard <eolinwen@xxxxxxxxx>]

You turn on this issue converting before your files in a format less
gluton like DNxHD converting with for sample EnKodeur-Mixeur. If you
want to use h264 files. Same things in the output format and convert
them in h264 HD with the same tool.

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https://bugs.launchpad.net/bugs/403154

Title:
  100% CPU core usage when previewing time-line

Status in OpenShot Video Editor:
  Invalid

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

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