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Frame drops with Birddog 4K Quad and vMix 25
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Joined: 1/22/2021(UTC) Posts: 16   Thanks: 5 times
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Hi, I'm expecting siginificant frame drops when grabbing 3 NDI sources at 4K @ 25FPS with Birddog 4K Quad to vMix 25. Here is a screengrab that I made with OBS https://youtu.be/bE4-pzL1zxI (The OBS or any other app on the PC was not using any NDI sources) The Birddog is running BirdDog 4K QUAD 4.5.181-LTS(BETA) firmware and we're on gigabit network with Aruba 2530 24G network switch. The cameras are two Sony ILME-FX6 in addition with Sony A7S3 converted to SDI via Atomos Ninja 5. Here is capture streight from vMix recorded on a local drive: https://drive.google.com/file/d/128QwJpzxSXyy1Sg2cUWCncy9JSptukel/view?usp=sharingPlease let me know, what the problem might be. We're trying to troubleshoot this for a few days now. Thank you!
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Rank: Advanced Member
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Joined: 2/23/2019(UTC) Posts: 135  Thanks: 16 times
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From the frame times in the statistics screen there is a lot of variation in timing between frames, from 5ms to 124ms. Ideally it would stay at 40ms. This could be the Birddog or maybe network. Testing with just one NDI feed to reduce network load, or just one SDI connected to reduce load on the Birddog, might help clarify were to focus your time)
One thing I've found help with poorly timed NDI sources is turning on 'Increase Buffer Size' when adding the input. If you can cope with a little more latency that should help ensure frames don't arrive too late for vMix to show.
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Rank: Member
Groups: Registered
Joined: 1/22/2021(UTC) Posts: 16 Thanks: 5 times
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Originally Posted by: RichDanby  From the frame times in the statistics screen there is a lot of variation in timing between frames, from 5ms to 124ms. Ideally it would stay at 40ms. This could be the Birddog or maybe network. Testing with just one NDI feed to reduce network load, or just one SDI connected to reduce load on the Birddog, might help clarify were to focus your time)
One thing I've found help with poorly timed NDI sources is turning on 'Increase Buffer Size' when adding the input. If you can cope with a little more latency that should help ensure frames don't arrive too late for vMix to show. I've just tested it with only one 4K source NDI coming to vMix and with only one camera (one of the Sony FX6 cameras) and it seems a lot better. It varies around 35 - 50 (if I'm looking in the correct column in the stats) See for yourself: https://youtu.be/QbvS4-4wXa8 Screenshot_23.png (128kb) downloaded 1 time(s).Just for the record, the Birddog is now set to UDP. I'm also troubleshooting with guys in Birddog User Facebook group: https://www.facebook.com/groups/BirdDogUsers/posts/1064017130844247/We've came to a conclusion that the problem is either the network (We might need to upgrade to 10 gigabit) or configuration of the Birddog Quad or vMix... Thank you for helping! :)
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