https://bugs.kde.org/show_bug.cgi?id=399305

            Bug ID: 399305
           Summary: When browsing images in preview mode, videos are often
                    not shown (black preview area), only sound is heard
           Product: digikam
           Version: 6.0.0
          Platform: Appimage
                OS: Linux
            Status: REPORTED
          Severity: normal
          Priority: NOR
         Component: Preview-Video
          Assignee: digikam-bugs-n...@kde.org
          Reporter: jens-bugs.kde....@spamfreemail.de
  Target Milestone: ---

SUMMARY
see $SUBJECT

STEPS TO REPRODUCE
1. open Digikam with album where there are multiple (mp4) video files
2. Enter preview mode with the thumbnail dock at the top
3. browse through images and videos

OBSERVED RESULT
When a video file is reached, it should play back (or at least optionally play
back.)

EXPECTED RESULT
Sometimes, videos are played, but no video is shown.
If I then go to the next image, view a few images, and then go back, the video
plays normally.
Maybe there is a race condition with multiple consecutive video files?

This happened with Digikam 4.x, 5.x and 6.0-beta, under Ubuntu 14.04 (Unity),
16.04 (Unity) and 18.04 (KDE), on an Intel Haswell i915 graphics system. Maybe
it also depends on the hardware (driver).

Currently, using Kubuntu 18.04 with KDE 5.12 and Digikam 6.0-beta 20180926xxxx.

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