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Thread: Very subtle video stutter

  1. #1
    Registered User cuspclub's Avatar
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    Very subtle video stutter

    No matter what machine, OS, or software I use to decode our Connect Spark, it has a very subtle skip to the video that reoccurs a couple of times each minute. I’ve tried it on our main gigabit network, and two different unmanaged gigabit switches with the same result. I’ve got the latest firmware on the Spark. I’ve tried Mac Sienna NDI Monitor, the Newtek NDI Monitor on Mac, the PC NDI Monitor, and even the Newtek Connect software with a Blackmagic MiniMonitor PCI card on a Windows 7 box.

    I’m feeding a 1080i 59.94 signal from different cameras. Is this normal behavior? I’m beginning to wonder if there is something wrong with our unit.
    Nick Nokes

    Gear used:
    Tricasters (460, 455, 300)
    Timewarp TW-42
    Cameras (Sony NX5U's, Panasonic PTZ's)

  2. #2
    'the write stuff' SBowie's Avatar
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    It would be great if you could run some timecode through the Spark and capture it locally, and if you see the issue in the recording, submit it as a bug.
    --
    Regards, Steve
    Forum Moderator
    ("You've got to ask yourself one question ... 'Do I feel lucky?' Well, do ya, spammer?")

  3. #3
    If you need some timecode footage, here are two clips you can play in your TriCaster DDR. Both clips are two minutes long, one is 30fps timecode, the other clip is just a frame count.
    https://1drv.ms/f/s!AvQUqb_Jvb0UgX7aHJjHJVUn4o9m
    Kane Peterson
    Key Accounts Sales Engineer
    NewTek, Inc.

  4. #4
    Registered User cuspclub's Avatar
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    Finally got around to doing some testing. I can't see the stutter with timecode, but I did upload some timecode footage here that went thru the Connect Spark via our Tricaster just in case it helps...
    https://www.youtube.com/watch?v=1jp0...ature=youtu.be

    Here's a short clip showing the stutter I'm seeing randomly...
    https://www.youtube.com/watch?v=tOaKGUtT0DA

    Both Sienna and NewTek NDI Monitor apps are showing my Connect Spark footage as being 1080P but I was definitely feeding it a 1080i signal as that's the max my source could output. I've attached a couple of screen shots showing that. Could it be this that is causing these weird stutters?

    Click image for larger version. 

Name:	Screen Shot showing 1080P instead of 1080i from Connect Spark into NewTek NDI Monitor.png 
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    Click image for larger version. 

Name:	Screen Shot showing 1080P instead of 1080i from Connect Spark into Sienna NDI Monitor.png 
Views:	9 
Size:	67.4 KB 
ID:	139949
    Nick Nokes

    Gear used:
    Tricasters (460, 455, 300)
    Timewarp TW-42
    Cameras (Sony NX5U's, Panasonic PTZ's)

  5. #5
    'the write stuff' SBowie's Avatar
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    Sorry, when I wrote "and capture it locally", I meant to record directly on the Spark itself. This would tell us whether the problem is at the device, or further down the line.
    --
    Regards, Steve
    Forum Moderator
    ("You've got to ask yourself one question ... 'Do I feel lucky?' Well, do ya, spammer?")

  6. #6
    Registered User cuspclub's Avatar
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    No problem Steve. I recorded the video to a SD card on the Spark and it seems fine there. I do see issues when decoded via NDI Connect to a Decklink card, & IsoCorder on the same machine. But I also see it on a separate PC and Mac

    Here's a good example of what IsoCorder captured right around the 33 sec. mark:
    https://www.youtube.com/watch?v=zjsf...ature=youtu.be

    But the SD card recording on the Spark at that same time was fine.
    Nick Nokes

    Gear used:
    Tricasters (460, 455, 300)
    Timewarp TW-42
    Cameras (Sony NX5U's, Panasonic PTZ's)

  7. #7
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    Interesting that it appears to slow down a touch, then has to 'catch up' after that.
    E. Lee Dickinson | President
    Advanced Visual Production | sound.lighting.video.design
    www.avprva.com

    Tricaster 850, 460AE, and TC-1
    JVC GY-HM200u, Canon XLH1, Fieldcast and BMD Fiber

  8. #8
    'the write stuff' SBowie's Avatar
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    Quote Originally Posted by cuspclub View Post
    But the SD card recording on the Spark at that same time was fine.
    So at least this points to the issue being downstream of the Spark unit.
    --
    Regards, Steve
    Forum Moderator
    ("You've got to ask yourself one question ... 'Do I feel lucky?' Well, do ya, spammer?")

  9. #9
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    At least downstream of the recorder. I'd guess that if we looked at a block diagram of the hardware, the NDI encoder is downstream of or parallel to the recorder. Jumping in because we also see some tweakiness with our Sparks, while the NDI feeds back and forth between our Tricasters have been pretty much perfect.
    E. Lee Dickinson | President
    Advanced Visual Production | sound.lighting.video.design
    www.avprva.com

    Tricaster 850, 460AE, and TC-1
    JVC GY-HM200u, Canon XLH1, Fieldcast and BMD Fiber

  10. #10
    Registered User cuspclub's Avatar
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    I’m somewhat surprised that my i7-3770 computer with 16gb ram and a dedicated graphics card GT710 - 2GB of VRAM and a 256GB SSD can’t record, send to SDI, or even monitor the Spark without these problems, and that’s on my dedicated gigabit network. Also surprising that my 5k iMac can’t monitor without visible artifacts too. Am I missing something?
    Nick Nokes

    Gear used:
    Tricasters (460, 455, 300)
    Timewarp TW-42
    Cameras (Sony NX5U's, Panasonic PTZ's)

  11. #11
    'the write stuff' SBowie's Avatar
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    There are others with more 'Spark time' than me, but in my experience most of these shirt off issues eventually come Dian to some sort of network problem.
    --
    Regards, Steve
    Forum Moderator
    ("You've got to ask yourself one question ... 'Do I feel lucky?' Well, do ya, spammer?")

  12. #12
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    Nick, have you tried monitoring at multiple points to see if the problem shows up in multiple places simultaneously?
    E. Lee Dickinson | President
    Advanced Visual Production | sound.lighting.video.design
    www.avprva.com

    Tricaster 850, 460AE, and TC-1
    JVC GY-HM200u, Canon XLH1, Fieldcast and BMD Fiber

  13. #13
    Registered User cuspclub's Avatar
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    I haven’t tried that but that’s a good idea. I’ll will do that and report back.
    Nick Nokes

    Gear used:
    Tricasters (460, 455, 300)
    Timewarp TW-42
    Cameras (Sony NX5U's, Panasonic PTZ's)

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