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[Andy Finch <1078135@xxxxxxxxxxxxxxxxxx>]

I've tried following your instructions but I don't get any flashes or
anything unusual.

"Put a still picture clip1 at time 0 seconds on track 1; set it to run 5 seconds.
Put a still picture clip2 at time 3 seconds on track 2; set it to run 5 seconds.
Put a 2-second Dissolve transition between then, starting at 3 seconds on the time line."

Have you double checked that clip 2 and the transition start at exactly
3 seconds, by using the values in the clip/transition properties?

The only thing I can think of that might help track it down is to get
the sequence.mlt file from the hidden openshot folder - ~/.openshot. If
you can attach that I'll take a look at it and see if I can work out
what is going wrong.

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https://bugs.launchpad.net/bugs/1078135

Title:
  Lower clip flashes at the end of a transition to the upper clip

Status in OpenShot Video Editor:
  New

Bug description:
  Put a still picture clip1 at time 0 seconds on track 1; set it to run 5 seconds.
  Put a still picture clip2 at time 3 seconds on track 2; set it to run 5 seconds.
  Put a 2-second Dissolve transition between then, starting at 3 seconds on the time line.

  When played, clip 2 starts to appear at second 3, is fully visible at
  5 seconds, but then jumps unpleasantly and then continues.

  Close analysis by moving the time cursor with the arrow keys shows
  that clip1 -- the lower, weaker clip -- flashes back on the screen for
  one frame at second 5.

  I have done this a number of times, and the problem is fully
  replicable.

  I have also found -- I think -- a work-around. Immediately after
  dropping the transition, change its length to 1.5 seconds and starting
  time on the timeline to 3 seconds, so that it is over well before the
  end of clip 1. But clip 1 is covered by clip 2. Clip 1 did not now
  flash at second 5.

  This work-around must be applied immediately on adding the transition.
  Once I had a misbehaving clip1, setting the transition to end before
  the end of the clip did not fix the problem. Even removing the
  transition and inserting the shorter one did not work. I had to
  completely remove the clip 1 from the timeline, then drag it back, and
  then set the transition to end short of the end.

  I originally submitted this bug as a question, and several other users
  commented that they are having the same problem. It is definitely a
  bug, not just my blunder.

  My OS is Ubuntu 10.04 LTS -- Lucid Lynx, the last LTS before the Unity
  disaster.  I installed Ubuntu from a CD years ago and have upgraded
  via the Internet. The OpenShot version is 1.4.3. I don't know what
  "melt" is.

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