Setting camera pixel format and resolution is failed.

Hello,
My environment is below,
Mac mini, MacOS M1 64bit, Sonoma 14.5
XCode: 15.2
Qt 6.7.1, QT_MEDIA_BACKEND = ffmpeg

I use QCamera and QVideoSink for video streaming capturing,
When I set camera pixel format and resolution to my camera,
The following message dumps in the console,
1. Motion-JPEG:
Cannot find AVCaptureDeviceFormat; Did you use format from another camera?
qt.multimedia.camera: Videotoolbox doesn't support cvPixelFormat: 0 "\x00\x00\x00\x00" Camera pix format: Format_NV12.
2. YUY2:
qt.multimedia.camera: Videotoolbox doesn't support cvPixelFormat: 2037741171 "yuvs" Camera pix format: Format_YUYV.

May I know if I misunderstand something?

Thanks.
Have a nice day.