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[Giuseppe <dalterio2@xxxxxxxxx>]

I'm using Ubuntu GNOME Remix 12.10 with OpenShot 1.4.3 and I have the same bug.
I don't know which version of MLT I have (I have all packages up to date, so the version should be the one included in the distro I'm using). Everytime the project saves the RAM usage grows by 100Mb. I had to disable the auto-save in order to use Openshot for more than 10 minutes. Disabling the auto-save I can now use it for more time, but after 15-20 minutes (probably depending on how many times I play the project) Openshot's using all my 4GB RAM and my 3GB SWAP too, and I feel oblied to ALT-F1 "sudo kill OPENSHOTPID".
I will try to check my MLT version and update it to the latest.
I will let you know what will happen by editing this post.

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https://bugs.launchpad.net/bugs/1119138

Title:
  Memory is not cleaned up, uses up all RAM and swap

Status in OpenShot Video Editor:
  Expired

Bug description:
  OpenShot gradually eats up all memory and even swap file as I work
  with a project that uses 20-30 clips. The more I play them, the more
  memory is used.

  I see in HTOP that it's exactly OpenShot's memory, not OS file
  caching.

  After 30-60 minutes, my computer becomes unusable, I have to close and
  restart OpenShot. Fortunately, this cures the issue, but it's very
  inconvenient.

  I have 4Gb of RAM and 4Gb of swap, Ubuntu 12.04 LTS, OpenShot 1.4.0

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