A number of Winamp users have found that they can't watch videos in the MP4 format (there is a sound output option). This quick fix should resolve that issue.
Solution
In order to enjoy your MP4 movies you must switch to an input plug-in that supports the MP4 format, follow these steps:
Open Winamp
Click on the Options menu> Preferences >"Plug-ins" > "Input"
In the right pane select "Nullsoft DirectShow Decoder v1.08" and click "Configure"
In the window that opens, add "MP4" to the extension list (do not forget the semicolon in front), then click on the OK button
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