Severe Preview and Output Stuttering When VDMX Window Is Overlapped by Other Windows on macOS 26

VDMX
1

Environment: M3 MacBook Pro, macOS 26

When running VDMX, if another window is layered on top of the VDMX window, the preview and output start to stutter severely.

The issue can be resolved by removing the overlapping window; however, this problem occurs not only with external applications like Chrome, but even when VDMX’s own settings window overlaps the main VDMX window.

I have already submitted bug reports about this issue twice in the past. Could you let me know what the current status is regarding addressing this problem?

2

Hmm, some more info on that here: VDMX and macOS 26!

Also, is it VDMX5 or VDMX6 (and which version)?

The previous user who reported this said the their output wasn’t stuttering.

Lastly, submit a bug report using the Help menu > Report Bug.

3

I’m using VDMX6 version 1.2.6.

I updated from 1.2.5 because the same issue was occurring there, but unfortunately the problem has not improved.

I’ll send you a link to a video for reference.

In the video, the top-right window is the output.

The stuttering also occurs even when the output is sent to a separate external screen, so it doesn’t seem to be an on-screen or display-only issue.

Please let me know if you need any additional information from my side.

4

Thanks for sharing this. One more question. What happens if you use the HAP codec on those videos? The screen recording is helpful.