Video and audio TS folder structures are the standard format for dvds....they ALL have them....the audio folder is always empty and the Video TS folder will have the .VOB, .IFO and.BUP files....depending on your player....most newer players play dvd-r ...some of the older players might not be able to play it.....remember ANY other format then Video TS and audio TS folders is NOT a standard dvd.....all dvds are mpeg 2 compression...and it is contained within the .VOB file as well as the audio.....other formats might be like compression and containers which for the most part are more compatible with PCs...like Divx, Xvid,WMV,H.264 etc....these are all types of compession using the newer mpeg 4 algorythm, they can be housed in several different types of "containers"....IE.....AVI is Audio and Video Interlaced....OGM,MKV are containers that can hold multiple audio and subtitle streams in the same file......mpeg 4 is similar to mepg 2 in that they are both "Lossy" formats, but retains a better quality at higher compression rates. at around 4 times the compression of mpeg 2...which is why satellite HDTV are switching to make the most of thier bandwidth.