Forum Discussion
Yealink HDMI ingest - lag and call failure
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?
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>theflyingirishman it doesn’t matter, they just need to be inline between the screen and the MTR system
- 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 🙂
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.
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
