视频usb捕获 dxshow 实现摄像头枚举 设备录制avi 视频截图,录制视频分辨率和帧数设置,同时支持电脑所有usb视频.单路采集-Usb video camera to capture dxshow enumerated devices to achieve record avi video capture, video recording resolution and fr a me settings, while suppor