Hi,all In Linux, the rate of camera capture is different for diffrent camera.For Logitech, it need 120ms to capture one frame, it means that it can only capture 8 frames one second. But for a good camera, it can capture 18-22frame one second.The time is not used in the ffmpeg but used in the system function "iotcl" equate with camera read. Because opencvalso use V4L, so the opencv speed is also improve use good camera. And because in Linux, system can't reopen camera, I can't use multithread to improve the capture rate.
nan hongzhen
