[SOLVED] Video playback on Linux (issue 1: Black screen)

[Freddy_H]

Hi all,
Last year I had QLC+ 4.12.2 running on Mint 19.something and also had video playback from within QLC working.
This year I decided to do a clean install of my 'production' machine :Linux Mint 21.3 and QLC 4.12.7 (qt5 version !) and I can't get my mp4 to play from QLC (plays fine in VLC) : playback gives a black screen (both full screen and windowed)

I vaguely remember that layst year I had to add some qt package (if i'm not mistaken) but I cannot find back the instructions I followed ...

Can someone point me in the right direction, please ....
Freddy

[mcallegari]

try these

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sudo apt update
sudo apt install libqt5multimedia5-plugins

[Freddy_H]

Thanks for the suggestion, but already tried that (found in a post here), but to no effect ...

[mcallegari]

Then perhaps try installing some more gstreamer plugins (gstreamer1.0-plugins-good and also gstreamer1.0-plugins-bad)

[Freddy_H]

Hi Massimo,
both the good and bad gstreamer plugins are already installed ... dead end here too

[mcallegari]

Do you actually hear the audio or not even that?

[Freddy_H]

Well, actually the video has no audio (it's a powerpoint saved as mp4 announcing the actors, running in a loop).
Also, mp3 audio in the sound chaser is playing fine.
I will try with another mp4 with sound and post the results here ...

[Freddy_H]

I just ran a test with another mp4 that has sound.
When I play it with VLC, I have image and sound.
When I (try to) play it with QLC, I have no image and no sound.
and just FYI, when playing the video from QLC I must attach a beamer and play on screen 2, otherwise the (gray) video image will take up my entire laptop screen -even in windowed mode - with no other way to get out except forced reboot ... (but that is another topic I will raise later).

[Freddy_H]

Santiago's suggestion on viewtopic.php?t=17086 solved this issue. !

Uninstall gstreamer1.0-vaapi :

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Check if installed:
sudo apt list --installed | grep gstreamer

Remove when found:
sudo apt remove gstreamer1.0-vaapi