Video output in recent Shotcut 26.6 is blank

Bug
1

  • What is your operating system?

Linux Mint 22.3 Cinnamon X11
Shotcut was installed as a Flatpak

  • What is your Shotcut version (see Help > About Shotcut)?

Shotcut version 26.6.25

  • Can you repeat the problem? If so, what are the steps?

After updating to the latest version, my video output is now blank and no video file displays in Shotcut.

image
image1920×1160 149 KB

I saw that there are two display methods, Vulkan and OpenGL, but they both gave the same result.

2

Hi @Dash3897

Did you try other files?
Did this particular .webm file work in your previous version of Shotcut?

3

The Flatpak works in general, but your computer is probably too old (or its drivers too weak) to support the new video output. Choose Settings > Player > Use Old Video Output.

You can provide your View > Application Log before making that change and after opening a video, and it might help me better understand the problem to possibly make it automatic.

4

this happens to all files not just .webm

I don’t think an Intel i5 10th gen and a GTX 1650 TI is too old right?

Using the old video output works.

Here is application logs before (I believe it to be the relevant bit)

log before.txt (40.8 KB)

here is application log after using old video output.
log after.txt (41.2 KB)

5

No, but I have several machines, some of which dual boot, including one with NVIDIA GeForce 4070 that boots into a Ubuntu based KDE Neon. They all work for me. That’s all I can do l, and if you have a problem use the old method. The log did not reveal anything.

6

I am running into the exact same issue, I think. I can load videos in Shotcut, but they will not display anything. I can hear the audio playing, but the preview is grey. I’ve tried all the suggestions: I’ve tried the “use old video output” option, I’ve enabled/disabled hardware decoding, I’ve run a full system update (Arch Linux), none of it seems to have any effect. Shotcut is completely unusable on my system now.

Unlike Dash, the timeline won’t even render for me:

image
image3838×2103 166 KB

Ignoring the video part, even if I try to use File > New > Color - there is no preview of that, either. Nor is there a timeline I could drag it to. Nor can I add tracks to the timeline. Some additional info:

Shotcut version: 26.6.25

QT version: 6.11.1

GPU: GeForce RTX 5060 Ti, driver version: 610.43.03, UMD version: 13.3

I don’t see any obvious problems in the application logs either:

application_log.txt (44.4 KB)

Shotcut worked for me a couple of months ago, when I last used it. Sadly now, it’s totally unusable and I don’t know how to fix it. Any advice would be greatly appreciated.

7

Try the latest version, it seems to have solved the issue for me for some reason.

8

It seems OpenGL is not working on your system. You can try settings > display method > Vulkan, but the old video output requires OpenGL whereas the new one does not. Meanwhile, my KDE Neon on Ubuntu 24.04 base with nvidia (driver version 580 on RTX 4070) works with either option of both settings. But I’m not gonna setup Arch on that.

9

Thanks for pointing me in the right direction. Just after I posted this, I noticed that even Kdenlive had the same problems. So it was a system issue.

For anyone who might run into this problem later, the issue was resolved by removing a single Plasma setting from ~/.config/kdeglobals:

[QtQuickRendererSettings]
SceneGraphBackend=software

We’re all good now. Thanks again!