Our new upload page is now validating data rate on video files. This means you will probably have to increase your data rate encoding settings.
You may have noticed that even with the data rate set to 3000 kbps, it is often variable, and dips belows 3000 kbps, prompting the Upload page to send an error message.
To resolve this, simply change your encoding settings to a higher data rate. We've found that 3500 kbps is pretty reliable, and only increases file size a bit.