To help narrow down the problem, please can you try speeding up your
videos using ffmpeg & melt:

for ffmpeg, something like this:

ffmpeg -i input.mkv -filter:v 'setpts=0.5*PTS' output.mkv

for melt, I don't know the exact cmd line syntax to use, so create a
simple project in OpenShot that has the problem. Then use the menu item
File>Export XML to create an xml file that can be parsed by melt, such
as:

melt filename.xml

By doing this, we can see if the problem is in ffmpeg, MLT or OpenShot.

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https://bugs.launchpad.net/bugs/1223555

Title:
  OpenShot Crash at videospeed x5 / x10 / ...

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