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Looking for a tool to report what codecs were used for audio and video encoding for all files in a folder. I use GSpot but it does it on a file per file basis. I want a tool to do it for all files in a folder. For windows.

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Check out MediaInfo. It has a command line version and can output any detail(s) about media files.

For example, this command will print the encoding library used to create the audio stream:

MediaInfo --Inform=Audio;%Encoded_Library% "MyFile.mp3"

Or to get an overview of all the available properties:

MediaInfo MyFile.avi

For additional details see:

MediaInfo --help-inform
MediaInfo --info-parametes
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