Forum Discussion
Yealink HDMI ingest - lag and call failure
Having the same problem with a customer on fifteen MVC840 Systems. But the tricky thing is that it works when internal users use HDMI ingest. No problems at all. But when an external user that is not in there tenant uses this i will start to lag directly. Works for both when they share content wirelessly, But as soon as the external uses the HDMI/USB-C cable it goes bananas and video/audio lags big time. Will also try third party EDID management, but the internal/external difference is not making any sense to me.
1. Rooms with 4K screens and Extron CTL-100 workplace controllers. MTR system manually set to 1920x1080 res. EDID on CTL-100's to be checked and changed to 1080p if required.
2. Rooms with 4K screens and pass-though 1080p EDID emulators in-line between MTR system and screen. MTR system set to 1920x1080 res (which unsurprisingly Windows reports as 'Recommended')
3. Rooms with 4K screens MTR system directly connected to screens. MTR system manually set to 1920x1080 res.
One observation is that even after hard-coding the MTR systems without CTL-100 or EDID emulators to 1920x1080 (scenario 3), the screens were still reporting a 4K signal. This is unexpected. I trust the screens, they are commercial Panasonic displays.
I am also promoting the use of Teams Cast to our users as an alternative method of screen sharing.
andy_bentley How have your three configuration testing modes gone?
Hi, Extron CTLs performing EDID emulation do help. As do simple HDMI pass-through emulators. We've proven both to help.
Just last week I got a report of screen mirroring delay again in one of our rooms, and upon checking the MTR had reverted to 4K resolution - and this is with emulators installed so I've no idea what had happened there! I took the opportunity to implement the new Resolution and Scaling options in the skypesettings.xml customisation file and did observe that the MTR system restarted in 1920x1080 resolution and this held across restarts regardless of whether EDID emulation was in-use. So this does seem like a good fix, to force the MTR itself into Full HD in software.
See the EnableResolutionAndScalingSetting, MainFoRDisplay and ExtendedFoRDisplay settings.
https://learn.microsoft.com/en-us/microsoftteams/rooms/xml-config-fileRegarding Teams Cast - it works, but we don't like it as it confuses our users. If there isn't an active Teams call to join, one is created meaning your experience if all you want to do is mirror your screen in a meeting room is you get it on one FoR screen only and the other shows a blank participants screen which is a pretty poor experience.
I am really hoping the new XML resolution and scaling settings see an end to our screen mirroring delays once and for all.
andy_bentley Thanks a lot for your solution. This was helping us very much. We had that problem only with two 4k Screens, if it is only one screen with 4 it is no problem, and if there is a 1080p screen and a 4k screen it was also no problem. But with the right content in the XML everything is working.
<EnableResolutionAndScalingSetting>true</EnableResolutionAndScalingSetting>
<MainFoRDisplay>
<MainFoRDisplayResolution>1920,1080</MainFoRDisplayResolution>
<MainFoRDisplayScaling>100</MainFoRDisplayScaling>
</MainFoRDisplay>
<ExtendedFoRDisplay>
<ExtendedFoRDisplayResolution>1920,1080</ExtendedFoRDisplayResolution>
<ExtendedFoRDisplayScaling>100</ExtendedFoRDisplayScaling>
</ExtendedFoRDisplay>
We hade five Yealink systems with a lot of lag problem at a customer. But then when we added a HDMI emulator to every screen we were able to eliminate the lag problem in all of the rooms. We used a emulator called : SE-HDMI-EMU-1080p
- Thanks, do these need to be plugged in at the screen end or the MTU end or does it not matter? Just trying to get my head around this 🙂
Nice. Let us know how it goes!!!.
I always say that the monitor is the boss in the system when it comes to resolution. We always need to use pass through EDID emulators to be able to set the 1080p resolution, and have it to stay there. Otherwise the monitors will "override" the system and it changes back to 4K/UHD. System needs to tell the monitors what they will get. Not the other way around :).
I know that Crestron actually and always includes a EDID emulator in all of their MTR systems they sell. Just because they know about these issues, and they tell us that they don´t support problems that occur if you don´t use it while setting up their hardware.
But i still can´t figure out why it works for internal staff, and not for external visitors.
tonyhermansen Your internal/external situation is very strange. I wouldn't expect user tenancy to affect content sharing (that happens through a combination of in-room hardware and software) to be affected by the Teams user account in any way. Any commonality to the external users? e.g. laptop make/model, or are they from one company who might be applying some funky system policies?
The 1080p EDID emulators I am using are ~£20 each from a large online retailer that has an association with a South American river.
- Yes, I think it is very strange. The customer has bought 800 Lenovo Carbon x1 Gen.9 laptops. But i have not myself checked what the external visitors have. I know that Microsoft up till a few days ago had som really big issues with not being able to call or invite external people directly from the MTR. So i had a thought if that was connected. Just because both problems was connected to external users. But we will install EDID Emulator and i think ours cost around 60Euro Each (The same one that Crestron uses for there MTR kits.) . Just to see if it makes a difference.
The only thing i can find from Microsoft or Yealink on this problem is the resolution issues. But i think that it would affect ALL users.
And i will also try to see this first hand to be able to look through the external computer and see if there is something there that causes this. I know that the CPU can rise very high when hosting a meeting and presenting at the same time. But i think that it should be able to deliver ok content at least.
