Fix Audio Sync Problems using Media Player Classic

 


This is a quick guide for correcting out of sync audio on your movie files. If the audio is out of sync throughout the movie by the same amount from start to finish it can usually be corrected during playback without too much difficulty.

If your movie gradually drifts out of sync during playback see step 7.

Before starting you'll need to grab some free software, download Media Player Classic v 6.4.9.1 from   here.   MPC will play most formats including Quicktime & Real Media with the correct codecs installed. Unzip the player to your desktop no installation is needed.


1. Open your movie from the file / open file menu


 

 

 

2. Play through the movie find a section with speech where you can see lip movement. Determine if the audio comes before the video or after the video.



 

3. MPC allows you to shift the audio stream as the movie plays go to the view menu and click on options, then enable the audio switcher and audio time shift boxes as in example 4.

 




 

4. If your movie plays the audio before the video you need a to enter
a positive value in the Audio time shift box.

As a guide try using 1000 ms for every second that the audio is out

if your audio comes 1 sec before the video try 1000 as a starting point

if your audio comes 1/2 sec before the video try 500 as a starting point

if your audio comes 1/4 sec before the video try 250 as a starting point

in example 4 (below) the audio comes 1/2 sec before the video

so an adjustment of 500 ms has been set

click apply & OK ... and check the sync

 




 

5. If your movie plays the audio after the video you need a to enter
a negative value, notice these are entered with a minus sign.

As a guide try using -1000 ms for every second that the audio is out

if your audio comes 1 sec after the video try -1000 as a starting point

if your audio comes 1/2 sec after the video try -500 as a starting point

if your audio comes 1/4 sec after the video try -250 as a starting point

in example 5 (below) the audio comes 1/2 sec after the video

so an adjustment of - 500 ms has been set

click apply & OK ... and check the sync

 

 

 

6. Keep altering the audio time shift value and replaying the movie until
the sync is correct. Make a note of the final value because you'll need to
use it every time you play this movie. If your movie is an AVI file you can
use this freeware program to apply the audio correction permanently

VirtualDubMod 



7. If your audio gradually drifts out of sync during playback then you probably
have a stretched audio sync problem that will require more work to put right.
For detailed help on fixing this type of problem visit

Nicky Pages' Digital Solutions




8. For codecs and other freeware tools ...

Free-Codecs.com

Freeware Geeks

 

 

Hit Counter April 2009

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::: reserved for updates :::