copyrighted content

I am planning on making a video that involves using other people's content, with a small inclusion of something I have to record myself. How can I include other people's content without getting the final video taken down for copyright? I don't know very much about copyright. I know people ask...

I have a 17 minute video, and used about two minutes of copyrighted content. I did so for the purpose of commentary, so I'm definitely within the rights of fair use. Immediately after uploading I was alerted "Includes copyrighted content." I have the option to file a dispute under "My use of...