I am looking for an app that will identify audio and video codecs in a given AVI or MP4 or what have you.
Does something like that exists?
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I like MediaInfo for that kind of thing.
The GSpot Codec Information Appliance is great for identifying codecs and containers of just about any file. The interface isn't great but it can be very useful.
Mplayer can dump data about a videofile.
There is a Windows version of it and you could parse its output.