Thanks for the bug report. On a "testing" system, with webcamoid 9.0.0-5.
$ rm -r ~/.cache/Webcamoid $ webcamoid [2023-01-20 12:04:13.838, Webcamoid, 0x7f432a7577c0, (0)] warning: QSocketNotifier: Can only be used with threads started with QThread [2023-01-20 12:04:14.975, Webcamoid, 0x7f432a7577c0, main.qml (152)] warning: qrc:/Webcamoid/share/qml/main.qml:152:5: QML ColumnLayout: Binding loop detected for property "width" [2023-01-20 12:04:15.037, Webcamoid, 0x7f432a7577c0, main.qml (152)] warning: qrc:/Webcamoid/share/qml/main.qml:152:5: QML ColumnLayout: Binding loop detected for property "width" [2023-01-20 12:04:15.153, Webcamoid, 0x7f426dffb6c0, (0)] debug: Camera input frame format: AkCaps(mimeType="video/unknown",fourcc=QVariant(QString, "MJPG"),fps=QVariant(QString, "30/1"),height=QVariant(uint, 720),width=QVariant(uint, 1280)) $ Pops up a window, quits when I hit the quit button. So I'm going to mark this as done as of 9.0.0-5, after merging it with 979029 which seems to be the same issue.