This article explains main video formats and later compares with photos the quality. Audio Video Interleave (.avi) Developed by Microsoft and released with Windows 3.1 way back when false teeth were still made out of wood, AVI files have been a work horse of digital video. Although its popularity has been waning, lots of legacy video in AVI can be found all over the web. More recently, AVI has been abandoned for Microsoft's WMV (Windows Media Video). One of the most maddening things about AVI today is that the format doesn't allow for specifying an aspect ratio, so a 16:9 AVI video may start displaying at 4:3 - this is less of a problem if your player allows you to manually select aspect ratios. If you're watching in the non-pro version of QuickTime though, you'll have to learn to live with people being unusually narrow. Advanced Systems Format (.asf) ASF is a proprietary Microsoft container that usually houses files compressed with Microsoft's
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