I know I've done this before. Convert an mp4 video to an mp3 audio from the Advanced menu in iTunes. (It's how I created the ringtone on my phone) But the option is greyed out now. Anyone know what's ...

What should you do when you don’t need to watch a video, but instead just need to listen to the audio? In these cases, you want the portability and storage offered in an MP3. We are going to show you ...