https://bugs.kde.org/show_bug.cgi?id=371729

            Bug ID: 371729
           Summary: git master - Transitions are affected by clips' alpha
                    channel, though it shouldn't be.
           Product: kdenlive
           Version: unspecified
          Platform: Other
               URL: https://youtu.be/KIwP-2ZWoQw
                OS: Linux
            Status: UNCONFIRMED
          Severity: normal
          Priority: NOR
         Component: Effects & Transitions
          Assignee: vpi...@kde.org
          Reporter: jesse.dub...@gmail.com
  Target Milestone: ---

User-Agent:       Mozilla/5.0 (X11; Ubuntu; Linux x86_64; rv:49.0)
Gecko/20100101 Firefox/49.0
Build Identifier: 16.11.70

See video in URL field for complete example & details.

In short, the transitions in Kdenlive produce unexpected results and behavior
because they're affected by the alpha channel of video clips, Title clips, etc.

Reproducible: Always

Steps to Reproduce:
1. Insert a video clip in timelime, then insert a Title clip over it, then add
a third video clip that starts at the end of the other two, overlapping the
others a bit.
2. Apply a wipe transition between them.
3. Playback timeline.
Actual Results:  
The transition is affected by the alpha channel of the clip and produces
unexpected results, forcing a more complicated edit to compensate than should
be necessary.

Expected Results:  
For the transitions to behave consistently independent of the alpha channel of
title clips, video clips, etc.

Bug discovered while using Kdenlive 16.11.70 git master build via
ppa:kdenlive/kdenlive-master.

Ubuntu 16.10, Unity 7.5.0 desktop environment.
KDE Frameworks 5.26.0
Qt 5.6.1

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