During frame by frame watching of some video taken via Instagram app one noticed strange unwanted artifacts on the video caused by camera flash. Please, consider below several sample image frames taken from the video:
Here we clearly see three cases:
- No camera flash.
- Camera flash: expected camera flash effect.
- Camera flash: unexpected camera flash effect (artifacts: the left side is brighter than the right side).
- Why this happens at all? How this is related to the physics of the filming process: camera flash speed light, image acquisition by the image sensor at 24..25 fps, video compression/decompression (guess the H.264 was used by Instagram app, video was taken at the end of 2018), etc.
- How to avoid such an artifacts next time?
Thanks in advance for the explanation.
Direct link to the full video: https://scontent-ort2-1.cdninstagram.com/v/t50.12441-16/45731449_1983300578418249_711802823897524155_n.mp4?_nc_ht=scontent-ort2-1.cdninstagram.com&oe=5D7924B5&oh=b2ddf05b200a10ababd105c8b23d7f23&dl=1