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Thread: Dante Audio and NDI video out of sync on TV's

  1. #1
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    Dante Audio and NDI video out of sync on TV's

    We have a TC1 that is taking in the NDI camera sources. We then have that feeding through a blackmagic 40x40 video hub to the NEC TV's in the room. We have our audio hooked up to a Yamaha TF1 sound board and feeding into Dante wall plates that feed through the system to the speakers in the room. The issue is the audio is arriving to the speakers first and then the video is getting to the TV's about .5 second later. We know that the delay is because we can't get the video directly to the TV's but not sure how to do that. We have heard that there is something that may provide NDI directly to the NEC TV's but not sure if that is out or not. What do you use to fix this issue? Thank you for any help you can provide.

  2. #2
    'the write stuff' SBowie's Avatar
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    You have a lot of devices in your video chain that each introduce latency. You might well be able to improve the video latency to a limited degree, but if the video latency isn't really an issue in your environment apart from the sync problem (depends on the venue layout) the simpler answer might just be to add an audio delay in your sound distribution system.
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    Unfortunately we can't delay the audio because then the person speaking in the room would have a .5 second delay from when there voice comes through the speakers. We have tried going direct out of the newtek device but the latency is still there.

  4. #4
    'the write stuff' SBowie's Avatar
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    Yeah, that's why I said it depends on the venue. Deliberate and phased audio delays are not unusual in large venues quite apart from video, and of course you'd get away with it scot free if your monitors were in external halls ... but it doesn't fit every situation.
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    Have you tried HDMI over ethernet? That should give you a longer cable run with less latency.

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