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Ability to recover from a thunderbolt disconnect - It is problematic that vMix needs to be restarted to recognize a reconnected thunderbolt source
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niemi  
#1 Posted : Thursday, October 18, 2018 1:00:24 AM(UTC)
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In vMix, a thunderbolt disconnect - caused by accidentally unplugging the cable or even just a potential driver bug - is catastrophic because vMix needs to be restarted to be able to recognize and use the input again. This means you would have to stop recording and streaming.

Both OBS (version 21.1.0 tested) and Blackmagic Media Express (version 3.5.5 tested) handle unplugging and reconnecting very well and do not need to be restarted, so my hope was that this robustness could be built into vMix 22.

In OBS the thunderbolt input will be refreshed and recovered automatically after plugging in the thunderbolt device again. This is nice, but even having the ability to manually right-click source refresh/reset would be a big improvement. The important thing is the ability to regain access to the input without closing/opening vMix.
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liveteko on 10/22/2018(UTC)

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KeldBendtsen  
#2 Posted : Thursday, October 18, 2018 2:06:10 AM(UTC)
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AngusFindlay  
#3 Posted : Thursday, October 18, 2018 11:04:57 AM(UTC)
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That would be catastrophic! Yes, please add that ability. I use a Decklink Duo 2 via Thunderbolt 3, and haven't had an issue yet, thankfully.
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richardgatarski  
#4 Posted : Friday, October 19, 2018 7:08:35 PM(UTC)
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We've had this problem many times during preparations, but luckily enough never in live situations although I am always afraid it will happen.
Thought it was a Windows problem, but if OBS and BMME can handle it, hopefully vMix can too.
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thanks 2 users thanked richardgatarski for this useful post.
liveteko on 10/22/2018(UTC), pba on 1/12/2019(UTC)
liveteko  
#5 Posted : Monday, October 22, 2018 10:38:22 PM(UTC)
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rowby  
#6 Posted : Saturday, October 27, 2018 11:30:15 AM(UTC)
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sinc747  
#7 Posted : Monday, October 29, 2018 11:31:43 PM(UTC)
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bluesman64  
#8 Posted : Saturday, November 17, 2018 1:06:04 AM(UTC)
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niemi  
#9 Posted : Thursday, January 10, 2019 6:52:28 AM(UTC)
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If this was fixed in vMix, would it apply to vMix 22 only, or also 21?
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azanisarri  
#10 Posted : Monday, January 14, 2019 5:44:01 PM(UTC)
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dedlinemedia  
#11 Posted : Wednesday, February 20, 2019 8:23:52 AM(UTC)
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I wonder, if after disconnect, you deleted and recreated the inputs, would that work? I don't have my T3 box yet to try. Maybe play a 2 minute break to give you time.
You could also use a separate encoder like from Teradek or an OBS PC to handle your stream. Not the best solution, as the stream may go black, but better than having to stop the stream and restart it and get people to rejoin imho.
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mjgraves  
#12 Posted : Wednesday, February 20, 2019 1:46:51 PM(UTC)
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I think this illustrates how unfortunate the TB3 connector is. It's like HDMI. Just not well considered for professional use.

That's why BNC and Ethernet are locking connectors. Convenience always has a cost, often in reliability.
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mgrayeb  
#13 Posted : Wednesday, February 20, 2019 4:02:09 PM(UTC)
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mavik  
#14 Posted : Wednesday, February 20, 2019 4:44:36 PM(UTC)
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I even have the same problem with my Av.IO USB3 capture card. Once it's unplugged it is lost in vMix.
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richardgatarski  
#15 Posted : Wednesday, February 20, 2019 6:51:11 PM(UTC)
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Originally Posted by: mjgraves Go to Quoted Post
I think this illustrates how unfortunate the TB3 connector is. It's like HDMI. Just not well considered for professional use. That's why BNC and Ethernet are locking connectors. Convenience always has a cost, often in reliability.

As a matter of fact, there are locking connectors for Thunderbolt, for example from Sonnet.

But the point here is "if" the Thunderbolt disconnects, it would be great if it just could be connected again without having to reboot the PC. Compare you can disconnect SDI or Ethernet, that will not lock the system.
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niemi  
#16 Posted : Wednesday, February 20, 2019 10:25:23 PM(UTC)
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Originally Posted by: dedlinemedia Go to Quoted Post
I wonder, if after disconnect, you deleted and recreated the inputs, would that work? I don't have my T3 box yet to try. Maybe play a 2 minute break to give you time.
You could also use a separate encoder like from Teradek or an OBS PC to handle your stream. Not the best solution, as the stream may go black, but better than having to stop the stream and restart it and get people to rejoin imho.


No, unfortunately not. You will need to exit vMix completely and open it again.

Most Teradeks encoders will lose sync whenever you stop the external output in vMix which will cause the stream to stop as well.

Some of the newer encoders, for instance, the Teradek CUBE 655, have a sync generator that will keep the stream running with a pattern/test signal while the input recovers.
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mjgraves  
#17 Posted : Thursday, February 21, 2019 2:30:22 AM(UTC)
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Originally Posted by: richardgatarski Go to Quoted Post

As a matter of fact, there are locking connectors for Thunderbolt, for example from Sonnet.


But those are proprietary. They require that the host device have the mating threaded hole. That's fine for a Sonnet box or card, it won't be there on any laptop.

The fact they are offered further illustrates the faulty design of TB3 for professional applications.
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Kelvin  
#18 Posted : Monday, February 25, 2019 12:49:31 PM(UTC)
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+1 and also have the same capability for USB devices such as capture and midi
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h2video.nl  
#19 Posted : Monday, February 25, 2019 10:57:56 PM(UTC)
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will do some tests. but isn't part of the problem the tb3 connection in windows itself. how dies bm handle disconnects?

if there is no problem at that level it would just require vmix to reload the preset ?!

for me all inputs hang on that connection so rec is lost anyway... stream is on a different machine...

stefan
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h2video.nl  
#20 Posted : Monday, February 25, 2019 11:08:22 PM(UTC)
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just did that now - was testing v22 - disconnected tb3 - vmix gives warning rec is stopped, actually the ext connection was. rec continues. replugged, stopped rec, restarted vmix reloaded
profile: running....

I think that's not too bad!

but you have to restart vmix again and load a profile or last...

keep an eye on that because your rec could be lost...

advantage is this is a fail proof restart of vmix, which I would prefer...

will watch this topic to see what Magic Martin can do...
stefan
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thanks 1 user thanked h2video.nl for this useful post.
mjgraves on 5/14/2019(UTC)
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