I have the two files separately and I need to merge them so that the sound is synchronized with the video.
How can I merge a .wmv file with a .wav file?
Preferably via a GUI interface.
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Try using Microsoft Movie Maker on Windows. It's free, and also gives you some more options (like determining if you want emphasis on narration or the background music). After you have downloaded it or located it on your system, click "add videos or photos" and locate the wmv file. Then, click "add music" and locate the proper wav file that you want imported. You can export it as wmv or mp4 by going to file, then save movie.
Audacity will do the trick and much more.