[dragonplayer] [Bug 442311] New: Dragonplayer does not play any video

[tagogaj]

https://bugs.kde.org/show_bug.cgi?id=442311

            Bug ID: 442311
           Summary: Dragonplayer does not play any video
           Product: dragonplayer
           Version: unspecified
          Platform: Kubuntu Packages
                OS: Linux
            Status: REPORTED
          Severity: grave
          Priority: NOR
         Component: general
          Assignee: unassigned-bugs at kde.org
          Reporter: tagogaj799 at shensufu.com
                CC: myriam at kde.org, sitter at kde.org
  Target Milestone: ---

SUMMARY

No matter what MIME type of video I attempt to play in Dragon, no video is ever
played. The videos play perfectly fine in other video players (VLC, mplayer) on
the same system.

STEPS TO REPRODUCE
1. Run `dragon ….mkv`, or `dragon ….mp4`, etc.
2. Click play button.

OBSERVED RESULT

No video is played.

The widget supposed to play the video stays in the usual background colour. The
slider indicating position in the video, volume button and full-screen button
remain deactivated. The status bar shows the file name of the video without
ending.


EXPECTED RESULT

Video plays.

SOFTWARE/OS VERSIONS
Windows: 
macOS: 
Linux/KDE Plasma: Ubuntu 21.04
(available in About System)
KDE Plasma Version: 5.21.4
KDE Frameworks Version: 5.80.0
Qt Version: 5.11.0-22-generic

ADDITIONAL INFORMATION

Output

```
Opening QUrl("file:///home/….mkv")
Stopped state
updated actions
updated menus
set titles 
seekable changed to  false
detected mimetype:  "video/x-matroska"
Initial offset is  0
using index:  -1  returned desc has index:  -1
using index:  -1  returned desc has index:  -1
chapters:  0  titles:  0
going from  "Loading"  to  "Stopped"
Stopped state
updated actions
updated menus
set titles
```

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