Streamclip MPEG creates artifacts (blue and multicoloured lines)

Hi everyone,

I'm a newbie here! I wanted to post on this forum as I can see a variety of activity (questions, answers) about Streamclip MPEG. Thanks in advance for your help.

Anyway, I'm having issues with clips that I've converting using Streamclip MPEG. The originals don't have these artifacts, but once converted, they appear. Please see sample images below:


[Attachment 42445 - Click to enlarge]
[Attachment 42446 - Click to enlarge]
[Attachment 42447 - Click to enlarge]

The file is output as .mov from Streamclip MPEG using the AVID DNxHD codec. Original footage in this case has been captured using a Nikon D3300 (25 fps), but the same artifacts appear using Geforce Experience's Shadowplay to capture game footage from screen (variables FPS, but targetted at 60).

My graphics card is a GTX-1070, and my processor is an Intel i7-6700HQ. My settings are in the photo above.

Am I being silly here? I assume it's a simple case of changing a setting here or there, but being a novice, I'm not sure where to start.

Thanks SO much for your help.

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