Unnessesary Overlay Shifting to the right side

[thecloud]

Hi, I would like to ask two questions concerning overlay appearance.
I use video Experimental Shiled v2 with Seeeduino Mega.
All sources are included.

1. Why does overlay shift to ve’s 3px. to the right? https://youtu.be/JpBTEJJCJQU
This is the source code – https://pastebin.com/8A5KK3Vm

2. Why is the overlay displayed on only one half-frame on the top of the screen?

This is the source code – https://pastebin.com/RBvdHeXQ

• This topic was modified 7 years ago by thecloud.

[Michael]

The shift to the right is caused by processing delay. By the time the code determines a pixel should be on, the scanline has advanced to the right for a few microseconds. I don’t think anything can be done because an Arduino can’t be sped up and a video scan line moves very fast from a timing perspective.

The flickering you are seeing at the top in the second video is timing difference between the video signal and the overlay. Try increasing the frame delay from 2 to 5. That reduces flickering but your overlay will update less often.

The Video Experimenter is very primitive, so I’m sorry there are limitations.

[thecloud]

Thank you very much for quick and helpful answer!

[Author]

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