How to correct unsynchronized sound and video

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Alex Ethridge

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I have an MPEG-1 or MPEG-2 video stored on a hard disk where the sound and video are out of sync by about 2 seconds. Remaking the video is not an option at this point. here's the question:

Is there a way to synchronize the sound in this video?

I have absolutely no experience with this kind of thing and have never edited a video at all so you might have to talk baby talk to me. :D
 
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It depends on a couple things. Is the sound consistently about the same time off throughout the video, or does the time increase as the video plays? In other words, does the sound just need to be shifted or also inflated in time?
 
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If you use VLC to play the file, there's a setting to delay or advance the audio sync.
 
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Also in GOM Player. If you can get the sound synched just by shifting by a couple seconds, then all that needs to be done is demuxing (separating sound from video) and then adding or subtracting a section of silence near the beginning before multiplexing them (putting them back together).

If you can't sync them that way, then the sound most likely also needs to be inflated in time (if the delay or advance increases as the video plays).
 

Alex Ethridge

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I don't know about inflating as we played only a minute or so of a forty-minute video to see the sound was not synchronized.

Let's assume for now (just to get started) the sound is consistently a couple of seconds off throughout the video. What is the best method for adjusting this and what is the best program to use?

A free program would be nice; but, a for-pay, commercial program is not out of the question.
 
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What is the best method for adjusting this and what is the best program to use?

VLC


Open VLC
Select Tools
Select Effects and Filters
Click the Synchronization tab
Move the advance of audio over video either - or +


You must do this every time you play the file if you are not willing to re-encode, which entails demuxing the audio as Elvandil mentioned. For that, AviDemux is the only tool you'll need.
 

Alex Ethridge

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Thanks. We want to make it permanent so we can put it onto DVD and not have to worry with the sync after that. I guess AviDemux is it.

I'll try to get on it some time in the next week and let you know my result.
 
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If you already have an audio/video converter, like Total Video Converter, they often have demultiplexing options. If they do not have any editing abilities, the extracted mp3 stream can be edited with Audacity, but usually they can also re-multiplex with various optional parameters. I use it, for example, to extract music from music videos.

TMPGEnc is also good, but not free. Other tools include AutoGK and VirtualDubMod.

I doubt very much that it will be necessary to purchase anything since there are so many of these very good tools available.
 
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