Python 如何使用videoflow从视频url或usb摄像头读取？

python库中有关于如何读取视频文件的内容，但如何从计算机中的usb设备读取视频？

它刚刚添加到其中。你可以这样做。只需确保在代码中正确设置相机的设备id

import videoflow
import videoflow.core.flow as flow
from videoflow.core.constants import REALTIME
from videoflow.producers import VideoDeviceReader
from videoflow.consumers import VideofileWriter

class FrameIndexSplitter(videoflow.core.node.ProcessorNode):
    def __init__(self):
        super(FrameIndexSplitter, self).__init__()

    def process(self, data):
        index, frame = data
        return frame

def main():
    output_file = "output.avi"
    device_id = 0
    reader = VideoDeviceReader(device_id)
    frame = FrameIndexSplitter()(reader)
    writer = VideofileWriter(output_file, fps = 30)(frame)
    fl = flow.Flow([reader], [writer], flow_type = REALTIME)
    fl.run()
    fl.join()

if __name__ == "__main__":
    main()