StageVideo AIR Windows desktop - maximum concurrent objects

Can anyone confirm the total amount of concurrent StageVideo objects that can be used in AIR Windows desktop? I appreciate it is hardware dependant, but I want to know the limit set by AIR, the documentation says 4, but I have successfully tested 7, and would like further clarification.

Documentation - StageVideo - Adobe ActionScript® 3 (AS3 ) API Reference

I'm developing a multi-user, multi-touch installation app for AIR Windows desktop, that will run across 3 Full HD screens, so I have a total canvas size of 5760 x 1080. The app is quite video intense, using 3 full HD videos as an animated background on each of the screens. Additionally, users will be able to select content, so there could be a further 4 videos playing (max res 1440 x 810), in addition to the 3 background videos.

I have just tested a prototype app (AIR 19.0.0.241) using StageVideo for all 7 videos, and it appears to work fine. AIR debug launcher shows my app using no more than 3.2% of the CPU, and GPU-Z shows my video card 'Video Engine Load' no more than 50% usage.

My PC specification is:

• i7 3930K 6 core 3.20 GHz (overlocked to 4.5 GHz)
• 32 GB RAM
• Geforce GTX 970 4GB RAM (4 monitor output)
• SSD
• Windows 10 Professional 64-bit

I'm just looking for confirmation on the total amount of concurrent StageVideo objects that can be used in AIR Windows desktop, as the documentation appears to be incorrect.