When i wach i DVD of my own the speed and everything else is ok... But when i wach a DVD->avi of the net i find that the movies do not play as fast as they should be...the movements aren't what they should be... What can i do to have the same quality of a real dvd?
Sounds like a problem with the player you are using or perhaps you dont have the correct codec. First of all, use WinDVD or something like it to play the file. If its still the same then search it for what codecs it requires using this program - http://www.afterdawn.com/software/video_software/video_tools/gspot.cfm
