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Hey i've made almost 10 music videos so far with this program and I haven't had any trouble until recently. My last two videos do glitchy things after I render them. I've used the excat same settings everytime, so I am confused on what the problem is.
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It looks like you are using slow motion and are applying 'optical flow' to your slow motion shots.
If this is the case - the issue you are seeing is the optical flow process trying to figure out which pixels to track and failing.
You will see this problem where one object (say his hand) crossing over another object (his hoodie and neck) and the pixels being blended in weird ways.
No simple solutions. There are more complex forms of optical flow (like the Twixtor plugin from Revision FX) that allow 'masking' to protect and exclude areas from each other but nothing much you can do in Premiere Pro* - except turn off optical flow for the sections where this happens.
In the past I've duplicated layers in Premiere Pro and combined these layers - one with optical flow, one without and masked between the two to 'fix' some optical flow issues I've had ... but it's a quick and dirty solution and usually not perfect.
*without additional plugins