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[Adam <1469845@xxxxxxxxxxxxxxxxxx>]

Similar problem noticed with a 3 track video of about 8min duration.
Memory and swap were both filled upon rendering with the export
eventually failing.

As a workaround, I attached a 2TB drive formatted for swap and engaged
swapon. Then tried rendering again. Memory usage reached about 2GB
(IIRC) before the export reported completion. However the resultant
video file was empty (0b).

Finally, split the video into 2 parts for rendering and created a new
project to splice the two bits together. That worked perfectly as if the
previous problem never happened. No memory chewing.

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https://bugs.launchpad.net/bugs/1469845

Title:
  Memory leaking when export video

Status in OpenShot Video Editor:
  Confirmed

Bug description:
  I created a project with 56 tracks. Each track included one clip from 10 to 15 seconds and one 3 second transition (blinds sliding). Resolution of the clips were 2304 x 1296 (H.264 / AVC, 25 frames per second). When I started exporting video to AVI(h.264) HD720p 25 fps I faced with memory leaking. System monitor showed a constant growth of memory usage up to 100 percent. 
  I found a solution but I hope that my letter will help you to fix your program.

  Solution was the next. I had to split my project into three parts,
  export them separately and then merge them together. I also mentioned
  that there was no memory leaking when I merged video clips without
  changing resolutions. So that may be a good idea to work always with
  converted versions of the clips.

  Environment:
  64 bits, 
  ubuntu 14.04 LTS (OS is not installed, starts from flash disk without swap partition)
  Openshot 1.4.3
  PC with AMD FX(tm)-6300 Six-Core Processor × 6, 8GB RAM

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