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dm365 video noise

QuinnAZ
Prodigy 90 points

I am using APPRO's IPNC with software load 0.7 and am seeing some video issues as seen below.

The one above is in single stream H.264 D1 mode with H3A turned on. This is continuous, with the lines and colours only shifting slightly.

 

This one is in single stream H.264, 720P resolution. It looks like the video row data is being compressed for some reason and then black shown on the remainder of the line. This happens on both the TV out and the RTSP stream, however it only happens occasionally.

I have added some debug prints, but haven't changed any settings. The system is running off NFS root.

Any ideas on what might cause these or where we should look for the problem/solution? Could this be caused by hardware issues?

Thanks,

Quinn.

 

  • 0
    Genius 5240 points

    Just to let you know, I'm running H.264 D1 streaming RTP packets and don't see any noise.  It's non-interlaced mode.  I don't know what H3A is??

  • 0
    TI__Mastermind 41665 points

    Are the images flickering around where the horizontal artifacts are (i.e. are the horizontal artifacts randomly placed)? The images look like they could be caused by noise on the video bus, the first looks like you might be missing the green channel some of the time somehow, and the second looks like you are having sync issues, both of which could be hardware related, though it is also possible that there is some bad configuration going on. I would start by running this past Appro to see if they have seen such issues before and if they have a newer software release (I have not worked with them myself).

  • 0 in reply to Bernie Thompson TI
    Prodigy 90 points

    The artifacts move around. The image itself is steady, but which lines are pink, changes.

    Some additional information that might be useful is that D1 and high JPEG resolutions are by far the worst resolution for this. Most of the others don't have the pink colouring and the issue described for 720P streams is quite rare.

     

  • 0
    Prodigy 90 points

    Just thought I'd post the solutions that we've found as I expect others will eventually see these issues.

    It turned out that these artifacts were mostly caused by internal cabling of the IPNC.

    1) The ribbon flex cable between the main board and sensor board had some good kinks in it. Replacing this helped reduce the second issue.

    2) Also it seems the wires for power between the power/ethernet board and the main board were partially responsible. If they are not perfectly seated, artifacts are seen. Typically trying to re-seat these or shifting the wires to be less bent helped.

     

  • 0 in reply to QuinnAZ
    TI__Mastermind 41665 points

    QuinnAZ said:
    It turned out that these artifacts were mostly caused by internal cabling of the IPNC.

    That would certainly explain the type of corruption you were seeing, noise on the video bus and syncs, I did not realize that the IPNC was using a ribbon cable internally (I don't have one myself), other IPNC kits (other processors) I have seen appeared to use stacked boards with hard connectors. I am glad to hear you were able to find a root cause, and I thank you for posting this information back to the community.