为了测试USB摄像头的特性，作者使用了qv4l2工具。观察到随着分辨率增加，帧率（FPS）降低：640x480支持30fps，1600x1200仅支持5fps。这表明分辨率升高，FPS下降；反之，FPS增加，分辨率下降。此外，相机支持YUV 4:2:2和MJPEG像素输出格式，其他格式需qv4l2工具转换。
I need a tool to check the usb camera's features.So I found the packet names "qv4l2".
And I found a very interesting point that is as follows:
640x480 30fps
800x600 15fps
1024x768 12.5fps
1280x1024 7.5fps
1600x1200 5fps
The FPS(Frames Per Seconds) becomes lower when the resolution becomes high.
resolution increase,FPS decrease.
or you can say
FPS increase,resolution decrease.
From the snapshot, we know the came
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