The video player screen stays black. I can only hear audio

Support Software & Applications
1

Hi all!
I have the same problem of kaffeine crashing when adding found channels.
The issue is identical also on KDE plasma, so I assume it is not DE related.
I managed to get it running (somewhat) installing it via Flatpak.
Now I am facing another issue:
When the channel is played, no video is played. The screen stays black.
I can only hear audio.
I runned the flatpak from a shell to see error messages with

flatpak run org.kde.kaffeine

I get this output with following error messages:

03-05-25 21:46:53.685 [Critical] Failed to create wl_display (No such file or directory) 
03-05-25 21:46:53.702 [Info    ] qt.qpa.plugin: Could not load the Qt platform plugin "wayland" in "" even though it was found. 
03-05-25 21:46:53.912 [Warning ] Qt: Session management error: Could not open network socket 
03-05-25 21:46:53.959 [Warning ] QCommandLineParser: already having an option named "h" 
03-05-25 21:46:53.959 [Warning ] QCommandLineParser: already having an option named "help-all" 
03-05-25 21:46:53.959 [Warning ] QCommandLineParser: already having an option named "v" 
03-05-25 21:46:54.181 [Info    ] kaffeine.dvb: Using built-in dvb device manager 
03-05-25 21:46:55.141 [Info    ] kaffeine.dev: Found dvb device : Realtek RTL2832 (DVB-T) 
TagLib: MPEG::Header::parse() -- MPEG header did not match MPEG synch. 
TagLib: MPEG::Header::parse() -- MPEG header did not match MPEG synch. 
TagLib: MPEG::Header::parse() -- MPEG header did not match MPEG synch. 
[libopenh264 @ 0x75f5940431c0] Unable to create decoder 
[000075f59401f130] avcodec decoder error: cannot start codec (libopenh264) 
[000075f59401f130] main decoder error: buffer deadlock prevented 
[000075f59401f130] gstdecode decoder error: Error from decodebin0: Nell'installazione di GStreamer in uso manca un plugin. 
[000075f59401f130] gstdecode decoder error: pipeline may not close gracefully 
[libopenh264 @ 0x75f57c0038c0] Unable to create decoder 
[000075f59401f130] avcodec decoder error: cannot start codec (libopenh264) 
[000075f59401f130] gstdecode decoder error: no suitable decoder found

I tried installing codecs, but with no luck.
At the end i decided to install a tvheadend server and started using it.
It works fine for the moment, and it allows me to watch TV from other devices on the network as well!

2

Your post has been moved to a dedicated topic. Please avoid adding your own issues to another member’s Support request.

Please provide system information as described (below).

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5

So you did?

flatpak install org.freedesktop.Platform.ffmpeg-full