Public bug reported:

The recent frei0r-plugins package contains two Cairo-related transition
effects: frei0r.cairoblend and frei0r.cairoaffineblend. Unfortunately,
these both contain a bug concerning alpha transparency that shows up
when rendering video, such as from video editors like Kdenlive,
OpenShot, and more.

This bug has been fixed in mid-Nov 2015:
https://github.com/ddennedy/frei0r/commit/63808414a36882b8bdd397aa24d5f61450151c4c

Now this is a downstream repository maintained by Dan Dennedy who also
develops and maintains the MLT media lovers toolkit that is used inside
Kdenlive and other video editors. Unfortunately, it is unclear as to
whether this fix has been already flown upstream to the frei0r code
repository. At this time it is unclear when the next frei0r code release
will be made.

I would like to ask you to integrate this fix anyway downstream (at
least for 15.10 and 15.04), if possible. This would help us as we see
quite some forum questions around broken alpha compositing in Kdenlive.
Getting this fix through the Ubuntu repository would help us as there
are quite some users around that use Ubuntu/Kubuntu for video editing.

Thank you very much!

** Affects: frei0r (Ubuntu)
     Importance: Undecided
         Status: New

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https://bugs.launchpad.net/bugs/1550766

Title:
  frei0r.cairoblend and frei0r.cairoaffineblend alpha transparency bug

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