一个运行时，启动另外一个就会两个同时挂掉
用了其他的摄像头应用ustreamer也是一样
网上说是内核问题，这个不改内核情况下可以解决吗？
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mjpg-streamer 挂掉的时候显示的是什么错误信息？
MJPG Streamer Version: git rev: 85f89a8c321e799fabb1693c5d133f3fb48ee748
i: Using V4L2 device.: /dev/video4
i: Desired Resolution: 640 x 480
i: Frames Per Second.: 10
i: Format............: JPEG
i: TV-Norm...........: DEFAULT
i: FPS coerced ......: from 10 to 15
o: www-folder-path......: www/
o: HTTP TCP port........: 8090
o: HTTP Listen Address..: (null)
o: username:password....: disabled
o: commands.............: enabled
Unable to start capture: Protocol error
i: Can't enable video in first time
i: cleaning up resources allocated by input thread
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