Video unable to play or map to buffers



  • Hi,

    I am trying to stream video through my QML application. I get the video through the c200 Hauppage usb capture device which uses the USBVision driver (http://linuxtv.org/wiki/index.php/USBVision_devices ). I can see the video display in VLC where I set it as the capture device /dev/video1. When it displays it says vl42:///dev/video1. When I try to display the video using these two locations (I'm not sure which I should use) I get the following errors:
    @
    Video {
    id: camera
    autoLoad: true
    playing: true
    source: "file://dev/video1"
    onStarted: {
    camera.play()
    }
    }
    @
    Results in:
    @
    GStreamer; Unable to pause - "file://dev/video1"
    GStreamer; Unable to play - "file://dev/video1"
    @
    And...
    @
    Video {
    id: camera
    autoLoad: true
    playing: true
    source: "v4l2://///dev/video1"
    onStarted: {
    camera.play()
    }
    }
    @
    Results in:
    @
    GStreamer; Unable to pause - "v4l2://///dev/video1"
    GStreamer; Unable to play - "v4l2://///dev/video1"
    Error: "Could not map buffers from device '/dev/video1'"
    @

    Does anyone have any idea how I can get this video to display?



  • I think your source path is incorrect. Try this code:

    @
    Video {
    id: camera
    autoLoad: true
    playing: true
    source: "/dev/video1"
    onStarted: {
    camera.play()
    }
    }
    @



  • When I use that source path, it says
    @
    Error: "Could not read from resource."
    @
    EDIT: The file://... now gives the error
    @
    Error: "Resource not found."
    @
    To clarify I am trying to stream NTSC video



  • I know this is quite old, but did you find a solution? I could imagine that video4linux devices are not supported out of the box, but I'm not sure and currently looking for more information. It would be great if you have any :)



  • I also couldn't play streaming video with the QML Video element


Log in to reply
 

Looks like your connection to Qt Forum was lost, please wait while we try to reconnect.