FPP V8: Video does not appear when clip starts, the monitor is not recognizing the video signal.

[patdelaney]

FPP Version and Hardware:
FPP 8.x master running in Pi 3+, but is reproducible in Pi 2 as well

Describe the bug and Steps to reproduce:
My theory currently is that when Pi is done playing a video, the HDMI output goes to sleep, which triggers the monitors to go to sleep. I don't remember this behavior in pre 8.x. So when video starts to play the monitors wakeup or re-adjust the the HDMI signal it's getting.

I've tested with 2 different smaller sets of monitors (different manufacturers) with the same results on v8.x
https://www.amazon.com/gp/product/B076GZVCP2/ref=ppx_yo_dt_b_search_asin_title?ie=UTF8&psc=1

I tested with 6.3 and got the following results:

• It appears that when the video stops playing we are just sending a blank or black signal. The monitor does not go to sleep. So when I start the clips the video is immediately seen.

I did fppos update to 7.5 with latest patches, tested and got the following results:

• Same results as 6.3 (good)

I did fppos update to 8 alpha 3 with latest patches, tested and got the following results:

• The delay is back, I think we are completely turning off video output in 8.x.
• I turned off the screen saver and it's the same behavior.
• I created a playlist with 3 video clips and it's the same behavior. It appears we are toggling some sort of video playback mode between each clip.