My Pioneer DV533K is able to display the transmission bitrate at any particular time while a disc is being played. This displayed value changes as the disc play progresses. I hope someone can help with the following questions: 1. What is transmission bitrate? Is this the sum of the audio transmission bitrate and the video transmission bitrate? 2. I know that basically the bitrate is one of the factors considered in defining picture quality. What value is considered necessary for a good quality picture? Do the Superbit titles show this ideal bitrate value? Is it always true to say that a low bitrate translates to poor picture quality? 3. I realize that the there is a conscious tradeoff being taken between high bitrate and the amount of data content (special features, subtitles, audio tracks, etc.). What exactly do they do when they minimize the bitrate to squeeze in more material into the disc? Doesn't every pixel on the screen have to be accounted for? If every pixel on the screen represents data to be transmitted, shouldn't my dvd player show a constant bitrate at any point in the disc? 4. I've seen some forum postings that refer to an average bitrate for a film. How did they arrive at this? My Pioneer player does not have an average bitrate for a disc. Neither does it display the film's filesize that would have allowed me to compute an average bitrate using the films running time. 5. Finally, what is the acceptable bitrate for DD5.1 and DTS? What is half-bit DTS bitrate? I'd truly appreciate any help.