I'm having an issue where I upload a video to YouTube, and the sound slowly falls out of sync when watching on iPad. I've tried everything I can think of (re-uploading, changing the bit-rate and the frame rates) but to no avail. Without fail, every time, the video will fall out of sync. This is easily fixed by backing up 10 seconds on the iPad's YouTube app, and letting it reload. It always works fine on the original file, any browser on desktop, and I haven't yet noticed it happening on a mobile device. Has anyone had this problem? If so, how did you fix it?