RESTART THE COMPUTER

Unplug the thunderbolt 3 cable to Black Magic Design UltraStudio Pro or the UltraStudio 4K Mini RESTART THE COMPUTER Plug in the thunderbolt cable Blackmagic Intensity Pro is connected via the Thunderbolt cable to the computer. Must use the thunderbolt 3 to thunderbolt 2 adapter shown here
Make sure the Headphones are plugged into headphone jack on IMac
DON'T USE THE "ROLLS" HEADPHONE SPLITTER FOR PROTOOLS MONITORING
Turn on the OLED LG or using the Remote
– Make sure it TV is set to HDMI it should be already!!
Go to Applications >Blackmagic Desktop Video and click on it to open
Make sure you see the Blackmagic Ultra Studio interface in the System Preferences
Go to >Apple>System Settings

System Prefs>Sound>Output>Make sure it is set to Blackmagic UltraStudio
Launch ProTools
Click OK Here
Click OK Here
Playback Engine click on Next

Click No here
Click Cancel here

Choose File Type .wav 24 Bit I/O stereo Create
Now go to Input and Output setup Go to >Setup>I/O
Make sure the Output Tab looks like this if not > Click "Defautl" on the I/O setup Then Click OK
Now that the routing and hardware is set up open the ProTools session if you have one created already or make a new session.
Navigate to the session and open it
Next Import the video into the project Choose Import Video
Navigate to the video file that you want to view in the ProTools session
Choose to import at Session Start
Choose to enable the Video Engine Click Yes here
If you would like to use the audio off the video file choose to save it to the default Audio Drive folder
Last step is to open up the Input and Output view in ProTools Go to > View>Edit Window Views> I/O >
Choose the format 1080 or 720 23.98fps Choose the Playback Quality - Note if there is stuttering choose Draft but Full should work
Make sure all the audio outputs are routed to the Built In Output 1-2 Stereo Then you should see image on the TV and hear audio on your headphones.