Mini Hifi's That Play Dvds And Picture Cds How do these things work?

[Dawid 0]

I was wondering if anyone who has a mini HiFi that can play DVDs and picture CDs (mine also plays .mp3 and .wma cds) can tell me why some work and some dont? My coldplay DVD works on it, I get picture and sound and stuff, but when I hired Broken Arrow DVD from the video store it didnt. Was it an old copy (my HiFi is quite new)? Are there different DVD display formats? How do I know whether one will work on my hifi? Its the same with pictures, though I haven't found a picture CD that works yet... Do they have to be in .jpeg, or.gif format? How do I find this stuff out, coz I dont have the instrucytion manual. Any help?

[RemoteConnection 0]

well , about pictures cd .... try to write by softwares like nero or winoncd (etc) , you can chek this link s for photocd :
http://www.adiweb.com/Qfacts.htm
http://www.disctronics.co.uk/?s=photocd.htm&search_404=1
http://www.dl-c.com/pcd.html