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Some file formats (or some files that are coded used some codecs) can be played in Windows Media Player "slow" or "fast". I can enable this by right clicking on the movie while watching, clicking "enhancements" and then "play speed settings".
There, you can see a slider that has a blue part. That blue part is showing the usable part for the file. For AVI, the slider is blue between 0.5 and 2.0.
Is there a list of formats or codecs that support this feature?
1It's the player, not the format. If WMP can't play a file with 2x speed for example, try VLC Media Player or MPC-HC (Media Player Classic Home Cinema). All the modern video players support this feature. – Apache – 2011-10-11T10:41:51.480
no wmp, also support this feature as I explained in the question; but not all the file formats... and I want to learn the supported formats – spinodal – 2011-10-11T10:46:18.227
Well, check the files with "MediaInfo". It's a pretty neat app, which will let you know what is inside the .AVI container. – Apache – 2011-10-11T10:50:52.887