@matthiasott I happened to notice https://matthiasott.com/uses that you use a Sony ZV-E10 with a Elgato Cam Link 4K on an Apple Silicon MacBook! I just recently got the Cam Link and am seeing the aspect ratio of the video coming out of the same camera as 4:3 (instead of 16:9) in https://developer.mozilla.org/en-US/docs/Web/API/MediaDevices/getUserMedia and in Slack. You wouldn’t happen to have solved that problem? 😅 if not, please ignore me!