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I was using uv4l package for streaming.suddenly it stopped working when I want run this command for example : "sudo uv4l -nopreview —auto-video_nr —driver raspicam —encoding mjpeg —width 640 —height 480 —framerate 20 —server-option '--port=9090' —server-option '--max-queued-connections=30' —server-option '--max-streams=25' —server-option '--max-threads=29'"

it return with this error : [core] No device detected

by the way uv4l is running background when it Raspberry restarts on boot and it's available on port 8080 and streams the video on http://raspberryIp:8080/stream but it seem I can not start another server Thanks in advance

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  • This could work: sudo uv4l -nopreview —auto-video_nr —driver raspicam —encoding mjpeg —width 640 —height 480 —framerate 20 —server-option --port=9090 —server-option --max-queued-connections=30 —server-option --max-streams=25 —server-option --max-threads=29
    – kuzeyron
    Sep 4, 2017 at 10:29

2 Answers 2

Reset to default
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Your new stream will be on '--port=9090'.

port=8080 is the default value.

so change your ip to: http://raspberrypiIp:9090/stream

or maybe your threadS flag IS causing a problem with the CPU.

Not sure if this could cause a problem, but maybe your trying to use two different encoding types which is causing a problem.

Or the --encoding=mjpeg' (I think the default is jpeg.) Do you have$ sudo apt-get install uv4l-mjpegstream` ?

Have you tried $ sudo service uv4l_raspicam restart ?

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I think the device resource can be allocated in a mutual exclusive manner by processes.

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  • Hi, what do you mean by that? What should I do? Any clue or solution?
    – Ali Titan
    Nov 24, 2016 at 9:47
  • I mean the camera can be used by a single process at a time.
    – vaha
    Nov 24, 2016 at 9:48
  • No I don't think so, because as I said it was working with these conditions, and even though I kill the running uv4l process before run new server but the same result.
    – Ali Titan
    Nov 24, 2016 at 11:31
  • You say that you are able to start multiple uv4l???
    – vaha
    Nov 24, 2016 at 11:33
  • maybe!! I edited my last comment read the end... "and even though I kill the running uv4l process before run new server but the same result. "
    – Ali Titan
    Nov 24, 2016 at 11:35

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