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USB cam with Nanopi M4 using motion package

I tried MJPEG and this is the output I’m getting on all three cameras with highest stream quality, max frame rate and frame width x height = 1280 x 720

Camera 1 2 and 3 show the below kind of choppiness (It is like a dynamic disturbance on the streams)

Kindly suggest how this can be dealt with

Below is my mask file (I don’t want to detect motion. Only to show the stream as it is)
1280 720

But when I change the stream to YU12, two streams work properly and the third one shows this a grey screen and shows ‘Unable to open video device’

Can’t figure out what the cause could be