Some YouTube users, myself included, are having issues when they upload a video to YouTube. Once the video has been processed the first few seconds are just grey/pixelated. Fortunately there is a simple solution…just add audio! I only get this problem with videos I upload to YouTube with no audio so I tried just adding a single 1 second audio sample at the start and reuploaded the file to YouTube. That resolved the issue.
Original upload without audio and hence faulty at the start:
To fix this I simply added a 1 second sound effect from iMovie’s collection to the start of the video and reuploaded, works fine now:
Don’t waste time like I did trying to export from iMovie in a different format, that didn’t work either, adding a tiny audio clip seemed to be my only resolution.