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[123vier <592506@xxxxxxxxxxxxxxxxxx>]

Same here, although any other player or video editor I've used plays it just fine. 
My system should have no problem (AMD 3.6 Ghz Quad, 8GB Ram) handling the preview.

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https://bugs.launchpad.net/bugs/592506

Title:
  Very Choppy Preview of H.264

Status in KDE Non-Linear Video Editor:
  New
Status in OpenShot Video Editor:
  New

Bug description:
  When previewing AVCHD (AVCHD is encoded in H.264) the video is
  extremely choppy, as well as the audio. Even playback of the media
  files in VLC Player is choppy. Doing a quick google search I found
  this. http://www.blog.arun-prabha.com/2010/03/02/how-to-play-m2ts-
  files-smoothly-using-vlc/ If "Skip the loop filter for H.264 decoding"
  is changed in VLC Player to BiDir it can play back smoothly. It
  decreases the video quality a little bit but plays smoothly. (And
  since this would be used for the preview, quality does not matter as
  much.) I think something like this might be available in OpenShot.
  (Does Openshot use the same H.264 libraries as VLC Player?) Anyway the
  preview is so choppy it is not is suitable for editing. The ACVHD
  clips were recoded at 17mbps. There are no effects or transitions on
  the clips.

  Ubuntu 10.04
  Software Center
  1.1.3

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