[dolphin] [Bug 452192] New: Dolphin preview panel audio set to 0% and not obvious how to fix

[Alberto Gonzalez]

https://bugs.kde.org/show_bug.cgi?id=452192

            Bug ID: 452192
           Summary: Dolphin preview panel audio set to 0% and not obvious
                    how to fix
           Product: dolphin
           Version: 21.12.3
          Platform: Neon Packages
                OS: Linux
            Status: REPORTED
          Severity: normal
          Priority: NOR
         Component: panels: information
          Assignee: dolphin-bugs-null at kde.org
          Reporter: lulosalsero at gmail.com
                CC: kfm-devel at kde.org
  Target Milestone: ---

SUMMARY

Could not hear Dolphin playing audio/video files in the Preview panel, the
issue was due to Dolphin unexpectedly setting its volume to 0%. The issue is
compounded by the lack of obviousness on how to fix the issue, versus older
versions of Plasma Desktop.


STEPS TO REPRODUCE

1. In Dolphin, make the Information panel visible if not already (press F11).
Make sure that the Preview option is enabled (right-click in empty select in
empty space of Information panel and enable the Preview option)
2. Select an .mp3/audio or video file. The issue is best noticed with a video
file that has audio.
3. In the Preview pane, click the play button.

OBSERVED RESULT

If the Dolphin audio setting is set to 0% then there will be no audio for the
previewed file.

Clicking on the speaker icon in the system tray for the audio volume shows that
the output devices are in a normal, audible range, yet there is no place to see
where Dolphin's volume is changeable. 

Upon further investigation in a non-intuitive way, going to the System Settings
-> Audio and scrolling to the bottom of the page, and only if Dolphin happens
to be playing a file in the Preview pane, a "dolphin:audio stream" entry
becomes visible. This can have a 0% value, which effectively mutes Dolphin's
Preview playback. 

In my case, it is unclear how Dolphin's audio was set to 0%. 


EXPECTED RESULT

Should hear the file's audio being played or some way to figure out how to fix
it. This is most noticed with video files because we can see that the video is
being played yet there is no audio.

We were able to diagnose my system and determine that sound was audible in
other programs like VLC but not from Dolphin's preview panel. And only digging
into System Settings -> Audio at a fortuitous moment revealed the issue.

In older versions of Plasma Desktop in the Audio Volume system tray popup
window, there was an "Applications" tab that displayed the individual volume
settings for all applications that are currently playing audio. For some reason
this tab is now absent, at least in my KDE neon system, and it makes it hard to
discern the issue.

This is being submitted as a bug because this could easily trip up
non-technical folks.

SOFTWARE/OS VERSIONS

Operating System: KDE neon 5.24
KDE Plasma Version: 5.24.4
KDE Frameworks Version: 5.92.0
Qt Version: 5.15.3
Kernel Version: 5.13.0-39-generic (64-bit)
Graphics Platform: X11
Processors: 8 × Intel® Core™ i5-8250U CPU @ 1.60GHz
Memory: 7.6 GiB of RAM
Graphics Processor: Mesa Intel® UHD Graphics 620

ADDITIONAL INFORMATION

-- 
You are receiving this mail because:
You are on the CC list for the bug.