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HyperCon Help with V4L2 Grabber

Discussion in 'Software Support' started by wou5er, 2 May 2019.

  1. wou5er

    wou5er New Member

    Messages:
    28
    Hardware:
    RPi1/Zero, RPi3, 32/64bit, +Arduino, +PhilipsHue
    Capture.PNG Capture1.PNG

    As you can see i got some issues with the grabber i got a gray screenshot an got violet and green colours around the edges...
    What am i doing wrong?

    [​IMG]

    [​IMG]
    [​IMG]
    [​IMG]
     
  2. Akriss

    Akriss Active Member

    Messages:
    486
    Hardware:
    RPi1/Zero, RPi2, RPi3, 32/64bit, +Arduino, +nodeMCU/ESP8266
    Are you sure your regional tv is the "ntsc" standard?

    Your user flag indicates the Netherlands region. I think that region uses the Pal video standard. Try Pal it may work for you.

    Hope it helps.
     
  3. wou5er

    wou5er New Member

    Messages:
    28
    Hardware:
    RPi1/Zero, RPi3, 32/64bit, +Arduino, +PhilipsHue
    I tryed that also but didn't work.. changed the capture resolution to the same as the grabber picks up 720x576 no succes
     
  4. Akriss

    Akriss Active Member

    Messages:
    486
    Hardware:
    RPi1/Zero, RPi2, RPi3, 32/64bit, +Arduino, +nodeMCU/ESP8266
    [​IMG]
    Your definitely in a Pal/secam tv standard region. So pal should be correct.

    Try using "-1" as the height and width. as that setting auto detects the video frame size.

    Hope it helps.
     
  5. TPmodding

    TPmodding Administrator Staff Member Administrator

    Messages:
    1,257
    Hardware:
    RPi1/Zero, RPi2, RPi3, +Arduino, +nodeMCU/ESP8266
    can you show us the output from "lsusb"
     
  6. wou5er

    wou5er New Member

    Messages:
    28
    Hardware:
    RPi1/Zero, RPi3, 32/64bit, +Arduino, +PhilipsHue
    Capture3.PNG
    I do have to say i connect the Grabber directly to the Pi without a external USB hub, It couldn't be possible to be a power issue? The power adapter is a 5V 2,5A wich should be enough i supose?
     
    Last edited: 3 May 2019
  7. TPmodding

    TPmodding Administrator Staff Member Administrator

    Messages:
    1,257
    Hardware:
    RPi1/Zero, RPi2, RPi3, +Arduino, +nodeMCU/ESP8266
    ok, then show us the output from "lsusb" :D
     
  8. wou5er

    wou5er New Member

    Messages:
    28
    Hardware:
    RPi1/Zero, RPi3, 32/64bit, +Arduino, +PhilipsHue
    sorry forgot to upload :facepalm:

    the output is on dev/video0
     
  9. TPmodding

    TPmodding Administrator Staff Member Administrator

    Messages:
    1,257
    Hardware:
    RPi1/Zero, RPi2, RPi3, +Arduino, +nodeMCU/ESP8266
    ok can you check the analog signal which goes to your usb grabber with an tv...to see if the signal is ok
     
  10. wou5er

    wou5er New Member

    Messages:
    28
    Hardware:
    RPi1/Zero, RPi3, 32/64bit, +Arduino, +PhilipsHue
    Yes i connected from the HDMI2AV to a RGB TV and there is a clean signal...

    So i think that the grabber is picking the signal wrong or something..
    I installed latest packages for raspbian and UT700
     
  11. wou5er

    wou5er New Member

    Messages:
    28
    Hardware:
    RPi1/Zero, RPi3, 32/64bit, +Arduino, +PhilipsHue
    I got it working now by changing these values but stil got some weird lines in the image... how come?

    "redSignalThreshold" : 0.0,
    "greenSignalThreshold" : 0.0,
    "blueSignalThreshold" : 0.0
    "sizeDecimation" : 8,

    to

    "redSignalThreshold" : 1.0,
    "greenSignalThreshold" : 1.0,
    "blueSignalThreshold" : 1.0
    "sizeDecimation" : 2,

    Could you explain why that would be needed?
    Also when the pi shutdown and the grabber is plugged in the grabber isn't detected when booted.. someway to solve it?
     

    Attached Files:

    Last edited: 3 May 2019
  12. Arakon

    Arakon Member

    Messages:
    137
    Hardware:
    RPi1/Zero, RPi3, +Arduino
    Those are interference lines. Either your cable from the grabber to to the HDMI converter is crap, or you are missing a GND connection somewhere.
     
    • Like Like x 1
  13. wou5er

    wou5er New Member

    Messages:
    28
    Hardware:
    RPi1/Zero, RPi3, 32/64bit, +Arduino, +PhilipsHue
    I bet a crapy one cause it was really cheapass one from ebay :D
     
    • Like Like x 1
  14. Arakon

    Arakon Member

    Messages:
    137
    Hardware:
    RPi1/Zero, RPi3, +Arduino
    Cheap is fine, just try to keep it as short as possible. I actually just plug the capture device directly into the HDMI converter, with no cable in between.
     
  15. wou5er

    wou5er New Member

    Messages:
    28
    Hardware:
    RPi1/Zero, RPi3, 32/64bit, +Arduino, +PhilipsHue
    Thats not possible due the 2 RCA female there has to be a cable in between. or any idea's to realize ?

    Mayby build one myself? already ordered some RCA male connectors for a other project got plenty over so taking 2 of those an put a Speaker wire in between as short as possible? Or would the speaker cable not be sufficiant for the job as it is not a shielded cable
     
    Last edited: 3 May 2019
  16. Arakon

    Arakon Member

    Messages:
    137
    Hardware:
    RPi1/Zero, RPi3, +Arduino
  17. wou5er

    wou5er New Member

    Messages:
    28
    Hardware:
    RPi1/Zero, RPi3, 32/64bit, +Arduino, +PhilipsHue
    What kind of splitter do you use?
    I got myself on of these hdmi splitters but i experience quaulity issues, contrast is changing drasticly they also claimed it would be 4k... but it sets the screen back to full hd, Could this be because the HDMI to AV converter only supports full HD and that causes the rest of the input and output to be full hd?
     

    Attached Files:

  18. Arakon

    Arakon Member

    Messages:
    137
    Hardware:
    RPi1/Zero, RPi3, +Arduino
    Those splitters only output the lowest possibly resolution, and since the converter only handles 1080p, you only get 1080p everywhere.
    The splitter I got is also a totally generic one, but rebranded by some local german company.. I got that used for cheap. It's actually probably the same thing you got.
     
  19. wou5er

    wou5er New Member

    Messages:
    28
    Hardware:
    RPi1/Zero, RPi3, 32/64bit, +Arduino, +PhilipsHue
  20. wou5er

    wou5er New Member

    Messages:
    28
    Hardware:
    RPi1/Zero, RPi3, 32/64bit, +Arduino, +PhilipsHue