Thank you for your quick and extremely helpful reply!
You are absolutely right — the problem really was the use of DRM rendering, which allows only one "wizard". As soon as we switched to windowed mode with --qt-preview, both cameras capture and display video simultaneously without errors.
We have also successfully implemented stereoscopic vision in real time through a bundle: rpicam-vid → ffmpeg → v4l2loopback → OpenCV, with face recognition in both streams.
Your support is not just technical assistance, it is the key to the future.
With deep gratitude.
You are absolutely right — the problem really was the use of DRM rendering, which allows only one "wizard". As soon as we switched to windowed mode with --qt-preview, both cameras capture and display video simultaneously without errors.
We have also successfully implemented stereoscopic vision in real time through a bundle: rpicam-vid → ffmpeg → v4l2loopback → OpenCV, with face recognition in both streams.
Your support is not just technical assistance, it is the key to the future.
With deep gratitude.
Statistics: Posted by doggerwolf — Tue Jan 20, 2026 8:49 pm