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[cenwen <eolinwen@xxxxxxxxx>]

Ah i have done an error. Sorry. I have not test with the reverse function but just only with the preview without this one.
It was a bug of MLT and i was believing that was resolved. I am using the version 0.5.10 and you ? 
sudo apt-cache policy melt

-- 
Problems with speed and reverse
https://bugs.launchpad.net/bugs/676133
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Status in OpenShot Video Editor: New

Bug description:
## Problem with speed :

  Length of a video part does not update when I want to play it slower.

  I needed to comment some part of the code to make it working :

  openshot-1.2.2/windows/ClipProperties.py : 808
    ##if speed_multiplier < original_speed:
      # clip is longer now (keep the short version)
      ##clip_object.end_time = clip_object.start_time + original_length
    ##else:
      # clip is shorter
    clip_object.end_time = new_end_time


## Problem with reverse :

  When I want to play a part of a video in reverse, it does not keep the good part of the video
  I changed a part of the code :

  openshot-1.2.2/windows/ClipProperties.py : 813
    if localcboDirection.lower() == _("Reverse").lower():
      clip_object.reversed = True
      tmp = clip_object.start_time
      clip_object.start_time = clip_object.max_length - clip_object.end_time
      clip_object.end_time = clip_object.max_length - tmp
    else:
      clip_object.reversed = False

But I'm not too good in coding... it works but only at normal speed. when I want to make it slower, I have an other part of the video again