what the heck is an mp4??????

i was looking for an ipod on ebay and i saw this. then i read and it says something about being an mp4. i was just wondering has anyone heard of this or this mp3/4 player?

http://cgi.ebay.com/2GB-MP3-MP4-Player-Audio-Video-Black-iPod-Nano-Case_W0QQitemZ9732323609QQcategoryZ118264QQrdZ1QQcmdZViewItem

mpeg4 its a video file,

but im sure you could find a few rogue codecs of the mp4 audio which most likely wont work on that ipod

Mit's just the audio from a dvd. I know my parent's new TL has something called DVD audio and it sounds really sharp. Just a guess, but maybe that is the format for those dvd cds?

mp4 is a video format lol, aka mpeg4 which microsoft has a few codecs for. dvd audio dvd's are still a raw format. Obviously with 4.7 gigs of space you dont need compression on audio. Otherwise just regular movie dvds are like.... ac3 or regular stereo for audio.

I was mentioning mp4 as and audio format because there was a codec roaming around 3 years back to "improve" on the mp3 format which..... well..... it really didnt improve it that much.

mp4 like the other people have said before me is a video file