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[Craig Newswanger <550606@xxxxxxxxxxxxxxxxxx>]

I'm seeing the same artifact.
It appears that the truncated file sizes vary in length around a megabyte.
Note the file sizes in the attached screen grab.  This sequence is from a 720p mp4 file.

Other than this... I love OpenShot.


** Attachment added: "imagesequence.png"
   https://bugs.launchpad.net/openshot/+bug/550606/+attachment/2115371/+files/imagesequence.png

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https://bugs.launchpad.net/bugs/550606

Title:
  convert to Image Sequence doesn't work in FullHD-Projects

Status in OpenShot Video Editor:
  New

Bug description:
  when converting a big (e.g.FullHD) Videoclip in an FullHD-Project into
  an Image Sequence (right-click on the clip), the program produces 1MB
  -.PNG-Files which can't be opened (Error: not enough compressed data,
  this comes, when opening the .PNG-Files in Linux). But when your are
  using a smaller project-resolution (e.g. NTSC or PAL), the Image
  sequence of the same Videoclip is working fine (as long as the
  picture-size stays smaller than 1MB). I suspect that the converter has
  a limit for the image-size of 1MB. When there would be a bigger file,
  then the converting process gets aborted and the next frame will be
  done before finishing the last one.

  1. Ubuntu 9.10
  2. PPA
  3. Openshot 1.1.1