[digikam] [Bug 366626] New: Video frame remains on screen even after moving to another item

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https://bugs.kde.org/show_bug.cgi?id=366626

            Bug ID: 366626
           Summary: Video frame remains on screen even after moving to
                    another item
           Product: digikam
           Version: 5.1.0
          Platform: Mint (Ubuntu based)
                OS: Linux
            Status: UNCONFIRMED
          Severity: normal
          Priority: NOR
         Component: Preview
          Assignee: [hidden email]
          Reporter: [hidden email]

When I play videos from Digikam 5.1.0, album view, They play just fine in the
preview zone, but when I move on to a different item (next/previous image or
video, or to a different album, etc.) the video remains on screen (although
frozen on the last displayed frame) exactly in the very same position and
doesn't disappear even if I alt-tab to a different application/window. It keeps
covering the part of my screen until I close digikam.

I guess it may be something of more general nature than precisely
digikam-related, because I had a similar problem long time ago with one of
video players, but now am experiencing it only with Digikam.

Taking screenshots with the built-in system tool doesn't show these stuck video
frames, even though they were still on my screen.

Reproducible: Always

Steps to Reproduce:
1. Launch digikam
2. Enter album view, choose an album with a video
3. Play the video
4. Press the key for next item (space) or previous item (backspace)

Actual Results:  
The previewed item changes but the video frame still covers the part of the
screen

Expected Results:  
The item changes and the video frame disappears and no longer covers any part
of the screen

Mint 18, Cinnamon
Digikam installed from:
https://launchpad.net/~philip5/+archive/ubuntu/extra?field.series_filter=xenial

Taking screenshots with the built-in system tool doesn't show these stuck video
frames, even though they were still on my screen.

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--- Comment #1 from [hidden email] ---
Created attachment 100542
  --> https://bugs.kde.org/attachment.cgi?id=100542&action=edit
Video playing

Video playing but the frame is not captured at all by the built-in system
screenshot tool

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--- Comment #2 from [hidden email] ---
Created attachment 100543
  --> https://bugs.kde.org/attachment.cgi?id=100543&action=edit
Video frame after alt-tabbing, was visible but not on screenshot

There was the stuck frame, covering a part of the screen even after I
alt-tabbed to another window, but the screenshot tool didin't capture it. Any
hint?

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Maik Qualmann <[hidden email]> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |[hidden email]

--- Comment #3 from Maik Qualmann <[hidden email]> ---
There may be a problem with your video driver. QtMultimedia used hardware
overlay for displaying video frames, therefore not visible in the screenshot.

Maik

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--- Comment #4 from [hidden email] ---
Created attachment 100545
  --> https://bugs.kde.org/attachment.cgi?id=100545&action=edit
Video playing (now visible)

Because screenshots didn't capture the video frame at all, I took a photo of
the screen. Now you can see the video playing. Yes, it was a very low
resolution video so the frame is tiny, but it happens regardless of the size.

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--- Comment #5 from [hidden email] ---
Created attachment 100546
  --> https://bugs.kde.org/attachment.cgi?id=100546&action=edit
Video frame stuck on screen (now visible)

Because screenshots didn't capture the video frame at all, I took a photo of
the screen. Now you can see the video frame stuck on the screen even after
moving on to a different view. The video is stuck on the last viewed frame.

Yes, it was a very low resolution video so the frame is tiny, but it happens
regardless of the size.

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--- Comment #6 from [hidden email] ---
Created attachment 100547
  --> https://bugs.kde.org/attachment.cgi?id=100547&action=edit
Video frame after alt-tabbing (now visible)

Because screenshots didn't capture the video frame at all, I took a photo of
the screen. Now you can see the video frame stuck on screen even after
alt-tabbing to another window.

Yes, it was a very low resolution video so the frame is tiny, but it happens
regardless of the size.

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--- Comment #7 from [hidden email] ---
(In reply to Maik Qualmann from comment #3)
> There may be a problem with your video driver. QtMultimedia used hardware
> overlay for displaying video frames, therefore not visible in the screenshot.
>
> Maik

The card is Intel HD 530 with standard  Ubuntu 16.4 / Mint 18 drivers. so it
would be pretty strange if there was something wrong with them, yet it is
obviously possible.

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[hidden email] changed:

           What    |Removed                     |Added
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         Resolution|---                         |FIXED
             Status|UNCONFIRMED                 |RESOLVED

--- Comment #8 from [hidden email] ---
Fix: https://github.com/linuxenko/ubuntu-skylake-i915-video-fix

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[hidden email] changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
   Version Fixed In|                            |5.2.0
                 CC|                            |[hidden email]

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[hidden email] changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
          Component|Preview-Image               |Preview-Video

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