I am shooting in 4k with a gopro 10. When editing, the video's are crisp and clean, but when I export them, they become pixilated. I have exported many times and this has never happened before. Any suggestions on what I might be doing wrong?
Which export preset, full name please, are you exporting with and did you change any of the parameters particularly those that are available in the Advanced options ?
Download and install MediaInfo and analyse the exported video and post the results, see this tutorial if you are not familiar with MediaInfo on how to setup MediaInfo and analyse a video clip.