Hello everyone! The purpose of this thread is to hopefully kick off a discussion based on the correct use of aspect ratios based on some questions I have.... Q1) How do I get out the actual stored video frame size IN PIXELS of any particular MPEG / AVI video? Q2) How is aspect ratio stored in an MPEG / AVI video? Is this basically the result of Q1) above? Q3) When I play a video in Media Player, the properties of an example video will state 768x576 (AR of 1.33:1 aka TV 4:3) but is played correctly with an AR of 2.55:1 (aka CinemaScope). How does this work? Q4) Using example in Q3) above, Flask reports that the size is 480x576, PAL, AR:4:3. Wierd, 480x576 = taller than it is wider!! In order to maintain the correct aspect ratio what video frame size should I use when converting to DivX? Q5) My best guess to Q4) above is 480x352 or should this be 768x576. Which should I use to produced the best quality output without unnessesary shrinking / enlarging of original? An info regarding Aspect Ratios greatly appreciated! (Apologies in advance if there is an obvious answer to these questions but I am finding Aspect Ratios a fascinating facet of Video Encoding that I would like to get right!) Many thanks, Andy.