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[Burt Bicksler <burt@xxxxxxxxxxxxxxxx>]

I meant to say at the start of the description that the UI becomes
unresponsive AFTER I move the cursor / read head around on the time line
or move the clips on the time line, not just on loading the title.

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https://bugs.launchpad.net/bugs/1694980

Title:
  UI becomes sluggish/unresponive with large animated title

Status in OpenShot Video Editor:
  New

Bug description:
  I've encountered a problem with V 2.3.3 and large animated title clips
  (and I suspect and clip containing a large number of .png still
  frames.

  The animated title I tested with had over 2000 individual .png stills
  in it.

  Architecture (64 bits or 32 bits) : 64 bits 
  Operating System & version: Linux Mint 17.1
  Ram: 8 GBytes
  HardDrive: about 500 GBytes free
  AMD Radeon graphics card with proprietary driver installed
  Installation Method : Runfine downloaded from Openshot.org
  Version of Openshot installed : 2.3.3
  BZR Revision used (if any) :
  MLT/melt version: 0.9.0
  avconv version: 9.20-6:9.20-0ubuntu0.14.04.1
  FFmpeg (i.e.libavcodec) version : libavcodec-ffmpeg56
  FFmpeg installation : None found in path, avconv is present

  Imported a short video from my phone.  Had the phone in wrong orientation so video was rotated.
  Rotated video in time line 90 degrees.  That was easy.

  Then generated an animated title (Space Movie).
  Dragged that title clip into the time line and then moved it ahead of my first clip.
  At that point the UI became unresponsive, and would not repaint if resized.  After maybe a minute or two the UI became responsive again.

  No crashes. But if I move the clip(s) or transition in the time line
  the UI becomes unresponsive again.

  Once the UI is responsive again the video plays in OpenShot, and I was able to export it just fine.
  But if I move the cursor in the time line and then click play it takes up to a minute before the video starts to play again from the new location.  It plays fine with no stuttering, etc.

  It is very repeatable, if I move the cursor again, the problem
  repeats, and usually the cursor will only move a fairly shot distance
  until I release the left mouse button and then I can click the cursor
  again and continue dragging it.

  It appears that if I drag the cursor where I want it and then wait for
  several seconds, up to a minute or so, that I can click play and it
  starts playing from the new location.

  Note that the total video time is about 2 minutes and 40 seconds on
  the time line.

  How to reproduce:
  1 - Generate the Space Movie animated title (I just used all the defaults for my test).
  2 - Have a short mp4 clip in the project, may be optional I didn't try without it.
  3 - Add the Space Movie title in front of the short mp4 clip.
  4 - Play the video and note that it works fine in the preview window
  5 - Render the video and note that it renders and then plays fine in an external player
  6 - Try moving the cursor/playhead around in the track.  Note that the preview window does not update for a long time.  Also note that if you position the play head back say 50 seconds and press play that the video does NOT start playing for a long time, in my case nearly a minute.  Also note that if you resize the OpenShot application that the window doesn't repaint and in some cases you also will get a pop up about a script has stopped working do you want to terminate.

  Unless this is something specific to my configuration this appears to
  be a buglet.

  Note that I have not had this problem with Kdenlive with even larger
  clips comprised of individual .png files running on the same machine.

  Shorter animated titles, tested up to about 200 frames, do NOT have
  this problem, everything is still responsive with those shorter
  animated titles.

  Also, I was able to work around the issue by just bringing the Space
  Movie title into the time line and rendering it to an mp4.  Then I
  brought that rendered title mp4 into my project and everything was
  perfectly fine, so it is only the originally generated longer animated
  title clips made up of individual .png image sequences that cause the
  issue.

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