On Nov 15, 2010, at 6:21 PM, Jonas Lopez wrote: > DVD, Webcam, Pix, and Images: why are they soooo different > > I continue to delve into the various differences on my several Mac > presentations. > > When viewing a DVD, even in FULL SCREEN presentation, the picture is perfect, > not a pause or flicker to be found. When I view a "canned video" downloaded > from the internet and presented in Quicktime, Real, or Windows Media, we have > pauses and disruptions even at small sizes.
DVD's are encoded via MPEG2, which is an asymmetric codec: it's significantly less computationally intensive to decode versus encode. (this is how it was developed to be, to allow cheap DVD players. Also why it takes iDVD all night to encode a hour's video to DVD on a G4 with a 1Gig CPU and a gig of ram.) The other files you are viewing are encoded differently, and require more computational effort to decode. -- Bruce Johnson University of Arizona College of Pharmacy Information Technology Group Institutions do not have opinions, merely customs -- You received this message because you are a member of G-Group, a group for those using G3, G4, and G5 desktop Macs - with a particular focus on Power Macs. The list FAQ is at http://lowendmac.com/lists/g-list.shtml and our netiquette guide is at http://www.lowendmac.com/lists/netiquette.shtml To post to this group, send email to [email protected] For more options, visit this group at http://groups.google.com/group/g3-5-list
