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Judge584
Tux's lil' helper
Joined: 18 Apr 2005
Posts: 110
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 Posted: Thu Feb 06, 2025 8:31 am Post subject: KDE : Desktop effects video preview? |
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Hello,
The desktop effect previews aren't working for me in KDE.
I'm in the settings (Workspace Behavior -> Desktop Effects) and I'm clicking the preview icons, but no videos are showing up.
Any ideas how to fix this? |
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rab0171610
Guru
Joined: 24 Dec 2022
Posts: 472
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| Posted: Fri Feb 07, 2025 8:08 am Post subject: |
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For me that is located at System Settings>Window Management>Desktop Effects.
Personally I don't care if they work or not. I have many of the default ones disabled and use a select few that I need. I know what they do and if I didn't, I can look it up online if I am really curious.
It appears to be an common issue over the years for various users on different distros with a variety of error messages.
I can replicate the issue. When running:
| Code: | | systemsettings kcm_kwin_effects |
When trying to view one of the preview videos, the error message in the terminal is:
| Code: | | [mov,mp4,m4a,3gp,3g2,mj2 @ 0x7f35ac001600] moov atom not found |
Which basically means the file is not readable due to damage or not being found. I think in this case it is likely the latter.
My understanding is that those preview videos are not installed on the system but downloaded via curl plugins provided by media-plugins/gst-plugins-bad. When that is installed, it doesn't seem to have any effect. To play the videos, media-plugins/gst-plugins-openh264 is required. However, at least for me, when that is installed the error message goes away but the file still does not play.
As a work around, I would suggest downloading the files you wish to view at:
https://files.kde.org/plasma/kwin/effect-videos/
It is not like you need to view them frequently. Once you have seen the preview and have an idea what the effect looks like, you can set it and forget it. One and done, out of sight out of mind. The preview would no longer be of any use.
See:
https://bugs.kde.org/show_bug.cgi?id=470826
https://bugs.kde.org/show_bug.cgi?id=440244 |
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rfx
Tux's lil' helper
Joined: 19 Apr 2023
Posts: 149
Location: de-by
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| Posted: Fri Feb 07, 2025 9:06 am Post subject: |
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Hi!
please emerge kde-apps/ffmpegthumbs and go to dolphin settings > preview > videofiles (ffmpegthumbs) and activate this. Good luck |
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rab0171610
Guru
Joined: 24 Dec 2022
Posts: 472
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| Posted: Fri Feb 07, 2025 4:23 pm Post subject: |
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| rfx wrote: | Hi!
please emerge kde-apps/ffmpegthumbs and go to dolphin settings > preview > videofiles (ffmpegthumbs) and activate this. Good luck |
kde-apps/ffmpegthumbs was already installed and has no effect in my case. It is also likely always installed on most distros that by default include a full KDE Plasma installation. As well, previews for video files are set by default in Dolphin file manager. It doesn't seem to be a likely cause of the issue. |
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