I don’t know if this really should go in the Newbie forum so feel free to move it. I understand that video information has 100% of the pixels change from frame to frame and MPEG2 compression basically just changes the pixels that change from frame to frame in order to cut down on the bandwidth (and filesize). My question is what do programs like DVD Shrink and DVDFAB do to decrease the filesize further. I mean the video they compress is already MPEG2 compression so they cant just change the pixels from frame to frame since thats already been done. Do they drop frames? Or change the bitrate on frames that don’t change?
This really has nothing to do with nothing. I am just interested in furthering my knowledge of MPEG compression and how it really works.