How to read from video url or from usb camera using videoflow?

Question

在Videoflow python库中，有一些示例如何读取视频文件，但是如何从计算机中的USB设备读取视频？

Answer 1

It was just added into it. You can do something like this. Just be sure to set the device id of your camera properly in the code.

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()