Converting video for iPod -- HELP!

[will7370]

Just bought an old 30 GB iPod Classic at a pawn shop. I'd like to put some video on it but I'm not sure about format. I assume I'll want to convert my files to MP4? I see options for conversion to 360p, 720p and 1080p. Will all these work on this old iPod?

Also, I know this is off topic, but I also see audio available for download in both MP3 and M4b format. What is the difference between these two?

Any help would be appreciated.

[hech54]

Use HandBrake and it's built-in iPod settings for video conversion.

[jman98]

MP3 is an older audio codec than M4B (M4B is AAC in an MP4 containter). Support is better for MP3 on various non-Apple devices. AAC audio is fine, but I'm not one of those people who seemingly believe that it is the only good choice and everything else is crap. I would expect your iPod to support both formats.