One of the most annoying video viewing experiences, at least for me, is a video where the audio is out of sync. You can think of video and audio as two lines that need to start at the same time to be in sync. If either one starts first, you get audio that is out of sync with the video. Many video players, VCL or MPlayer variants for instance, have tools to correct out of sync audio. But what if you want to burn the video to DVD to watch it on TV, or give it to someone as a gift?
Then you need to correct the out of sync audio before you burn the video to DVD. If you do not chance is high that viewing the video DVD will not be a pleasure at all, considering that most hardware DVD players do not have options to correct audio that is not synchronous to the video.
One of the best programs to correct out of sync audio is VirtualDub. Downside is that it may not work with all video formats, and that you may need to install a codec to work with a specific video format in the program.
The process itself is however dead easy, provided that you know the exact milliseconds that the audio is playing to early or to late.
Load the video into VirtualDub after installation. You do that with a click on File and the selection of Open Video File from the menu. If you get an error that a codec is missing you need to install an appropriate codec for the video format before you can correct the audio discrepancy. This is usually the case when you use a video player like VLC or MPlayer which come with their own binary codecs that cannot be used system-wide.
Make sure Direct Stream Copy is selected under Video and Audio in the menu bar. Now select Audio > Interleaving. You should see the following screen.
Locate the Delay audio track by setting and enter the time in milliseconds that is needed to synchronize the audio with the video. Enter a positive number to delay the audio track, or a negative number to start the audio track earlier.
I suggest you use a program like VLC to find out the exact time in milliseconds that that audio is out of sync. It usually takes to long to use VirtualDub to find that out.
Click OK afterwards to close the configuration screen again. Now select File > Save as Avi to save the video with corrected audio to the local system.
And that's it. You have correct out of sync audio of a video file which can now be burned to video DVD.
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Ghacks is a technology news blog that was founded in 2005 by Martin Brinkmann. It has since then become one of the most popular tech news sites on the Internet with five authors and regular contributions from freelance writers.