4k video Stripe problem while recording 4k video - Sony a6300

[andremacias]

Hi! This is my first post.

I just bought a Sony a6300 and i have a problem while recording 4k video. I'm using a Sony 55-210mm lenses.

When i select 4K Video and the options: 24p 100M (super 35mm) and 24p 60M (super 35mm) some black bars (stripes) appears on the video. (i'll attach stills).

This is "resolved" by making higher the ISO around 6400-20,000, but then at 25,600 the black bars appears again (and stronger).

I don't know if there is something with my configuration (i haven't changed a lot of things since i bought it, almost everything is on default), or if it is another kind of problem.

I used also the 16-50 kit lenses and the stripes appear too.

Thanks for your help!

*The one with the BEAR is 24p 60M, the one with the purple curtains is 24p 100M.

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[Girish Noir]

What is ur shutter on that time..?? The proposed problem is flicker that might happen bcoz of the light which used in that room..