This tutorial will teach you how to use a free program called AVI-MUX GUI to synchronize the sound in your .avi files so it matches up with what is happening in the video. Download the program by clicking here: AVI-MUX. Unzip the folder, there is no need for installation or anything like that, simply leave all the files and folders alone and run the .exe (AVIMux_GUI.exe).

After you've opened AVI-Mux, look at the top where it says "open files (add files via drag & drop)." The blank white space below this text is where you'll want to drag and drop the .avi file for which you want to synchronize the sound. If you want to drag and drop the .avi file, feel free to do so, but you may find it easier to right click on the white space and click "add" which will let you navigate to the .avi file and select it. Pick your method and then add the file you wish to edit.

Should look like this so far:


Now, highlight the movie you put in that white space, and then click the "generate data source from files" button.

In the BIG white space (not the one referred to above), you'll see something listed similar to this:


Now, select the audio (seen above) and to the right of it you'll see this:


By inserting a number into this field, you'll be delaying the time when the audio starts. If the sound of the .avi needs to start later, experiment using positive numbers so the sound does not start as quickly and will line up with what's happening on the screen. On the other hand, if the sound is too delayed, try using negative numbers so the sound in the movie starts sooner. There is no real way to get this perfect, it's simply trial and error. Keep experimenting with different numbers until you get it perfect, it takes me 20+ tries sometimes.

After you've inserted a number, click "start." What this program is doing, is creating a new .avi file identical to the old one, but this time the sound will be delayed according to what number you put in the delay field. So, after clicking "start" you'll be asked where to save the new .avi file. Save it somewhere and then AVI-Mux will begin generating the new .avi file. This should only take a maximum of two minutes or so.

Now, test out the new .avi and see if it's any better than the original. If not, then just delete it and keep trying (make sure you don't delete the original though!).

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