Supported YouTube file formats
Not sure which format to save your video? Receiving an "invalid file format error message when you're uploading"?
Make sure that you’re using one of the following formats:
For more advanced information on file formats you can read through this article on encoding settings.
If you're using a file format that's not listed above, use this troubleshooter to learn how to convert your file.
Select the file format you'd like to convert
Are you using Windows Movie Maker or Windows Live Movie Maker?