How does Scrcpy screen send H.264 stream packet decode into picture

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Transfer h.264 bare code to image implementation code. Hope to adopt

import av
import sys
 
def h264ToJpg_demo():
    inputFileName = "input.h264"
    container = av.open(inputFileName)
    print("container:", container)
    print("container.streams:", container.streams)
    print("container.format:", container.format)
 
    for frame in container.decode(video = 0):
        print("process frame: %04d (width: %d, height: %d)" % (frame.index, frame.width, frame.height))
        frame.to_image().save("output/frame-%04d.jpg" % frame.index)
 
 
def main():
    h264ToJpg_demo()
 
 
if __name__ == "__main__":
    sys.exit(main())