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mjgraves  
#1 Posted : Sunday, August 11, 2019 3:32:53 AM(UTC)
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Here's a curious thing. Setting up for a conference where I was using (2) BirdDog Studio encoders to capture presenter laptops at podiums. Naturally, we'll be changing sources as we transition between presenters. So, there will occasionally be no input connected to the BDS.

When this happens it hangs vMix hard. So hard that I can't kill the process from task manager. I must reboot the PC, which is definitely not an option. FWIW, the faulty NDI stream also causes problem for Newtek Studio Monitor.

To overcome this issue I tried two things:

(1) Added a Decimeter Design scaler ahead of the BirdDog encoder. I've used these in the past to ensure that the source is always 1080p59.94. This did not help the problem of vMix hanging when we changed source laptops upstream.

(2) Fed SDI output of the scaler into a BDM ATEM, using it as a frame sync. Input #1 routed to aux out #1 to BirdDog #1. This DID solve the problem.

I've opened a ticket with BirdDog on this matter. They admit that there are circumstances which cause their encoder to send a faulty stream. That should not happen. They should act like a frame sync. Lacking for an input, send clean back.

It's worth noting how vMix behaved. vMix did not crash, but become uncontrollable.

The gear was rented for an event, so I had little opportunity to experiment. May experiment using BirdDog Mini now that I'm back in my office.
mavik  
#2 Posted : Monday, August 12, 2019 10:34:48 PM(UTC)
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Have you tried restarting the video within the BDS web interface.
mjgraves  
#3 Posted : Tuesday, August 13, 2019 12:27:23 AM(UTC)
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Originally Posted by: mavik Go to Quoted Post
Have you tried restarting the video within the BDS web interface.


Oh, yes. But by the time the source was switched vMix was already ceased up, forcing a reboot of the PC. Rebooting the BDS devices would have been annoying but acceptable.
mavik  
#4 Posted : Tuesday, August 13, 2019 5:41:46 AM(UTC)
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Are you able to reproduce with what exact steps, if. I would like to doublecheck on my end.
mjgraves  
#5 Posted : Tuesday, August 13, 2019 8:01:15 AM(UTC)
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Originally Posted by: mavik Go to Quoted Post
Are you able to reproduce with what exact steps, if. I would like to doublecheck on my end.


I'm waiting on Fedex to return my vMix host. It should arrive tomorrow. Then I'll be able to test again.

That test will use a BirdDog Mini and several different source computers.
dark_ata  
#6 Posted : Wednesday, August 14, 2019 4:21:02 AM(UTC)
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i have the same problem but using the blackmagic quad 2, some times if you change the resolution of the input the vmix stop to respond, the streaming and recording are fine but you cant change camera or any parameter, later some seconds to minutes start working again great.
mjgraves  
#7 Posted : Friday, August 16, 2019 12:26:17 AM(UTC)
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This is peripheral to vMix, but further testing with a BirdDog Mini has shown that changing input will quite often cause a downstream device using the NDI stream to fail. Not always, but often enough.

In testing I used vMix and NDI Studio Monitor. Most often, NDI Studio Monitor loses the stream and eventually collapses. Occasionally it displays a malformed image (as attached.)

UserPostedImage

I've passed my findings to BirdDog support. IMHO, the device should have a more graceful failure mode. It should never output a faulty stream.

kevev  
#8 Posted : Saturday, August 24, 2019 2:12:47 PM(UTC)
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I have experienced the same thing 4 times today during a test broadcast. Very reproducible. Sony AX100 cameras into bird dog mini, into switch, into vMix.

Almost every time that the HDMI cable is disconnected between the camera and bird dog, vMix will hard crash. No errors, it just closes.

Wondering if vMix can handle this issue better, or if it is a bird dog issue.

Wondering if there are any good hdmi to NDI converters out there.
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