https://bugs.kde.org/show_bug.cgi?id=366571
Bug ID: 366571
Summary: Kdenlive git master w/ movit: video playback
corruption after end of CPU transition
Product: kdenlive
Version: unspecified
Platform: Debian unstable
OS: Linux
Status: UNCONFIRMED
Severity: major
Priority: NOR
Component: Effects & Transitions
Assignee: vpi...@kde.org
Reporter: directact...@hushmail.com
When Movit is enabled, at least one CPU effect is on a track, and it is
transitioned into from a track above it using a CPU transition (e.g. wipe with
an image or dissolve), playback becomes severely corrupted as soon as the
transition ends and the track has nothing left to composit with. Sometimes this
also causes kdenlive to crash, but not always.
Tracks with no effects OK, tracks with only Movit (GPU) effects OK, tracks
transitioned into from below with any effects OK, Tracks with GLSL transition
between them OK. If only "dissolve" transitions are used GLSL wipe works well
though must be inverted for transition down.
Playback after transitions normal if Movit is disabled.
Reproducible: Always
Steps to Reproduce:
1.Put a clip on a track, and another clip on a lower track later in the
timeline with an overlap
2. Put any CPU effect on the second track
3.Put any CPU transition between the tracks, it must transition DOWN to the
second clip
Actual Results:
Severe video playback corruption as soon as the transition ends. This can be
suppressed by putting a totally transparent image clip above the track in
question. This indicates that once compositing to the track begins it must
continue or playback is corrupted
Expected Results:
Track should play normally after end of transition.
Kdenlive from GIT master, any version the last couple weeks. MLT is 6.3.0 from
GIT master as well, both July 5 2016 and August 8 2016 pulls same results.
Projects first made with versions of Kdenlive from June 2016 or earlier are not
affected-and starting from an empty project made with a June 10 build of
16.07.70 I saved is gives the expected results (normal playback) even when
using current 16.11.70 git master. Thus something in how composited tracks are
written to the project file is to blame. Adding a track to such a project
immedialty brings back the corrupted playback, no recovery possible exept from
backup project file-or by replacing every transition with a GPU transition.
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