iHome > Synchronize


Sometimes a movie can have synchronization problems. Having the audio delayed or in advance with respect to video is very disturbing for playback experience.

With SimpleMovieX you can solve this. (Except in movies containing MPEG media)


Open the Tools Pane, select Audio.

Displaying the Audio WaveForm as in the picture below can help, but is not mandatory.


sync.jpeg


You will synchronize manually:

Playback a few seconds.

Determine if audio is delayed or in advance.

Push left or right sync button (Left to correct a Delay, Right for advance)

Do it again until audio and video are in perfect sync.


sync2.jpeg


Note that the Playback button is special for this operation: You must maintain it pressed, and when you release it the playback comes back to the same point. This is very handy to listen several times the same seconds of the movie.


The number below the buttons is the amount of seconds that you have corrected. A negative value means that you are correcting a delay. Time increments are 0.05 seconds.


Don't forget to save the movie after fixing it!


Resynchronize by chunks

The worse case in when audio is not synchronized, but by an amount that varies along the movie!

For example, you can have perfect sync at the beginning, then a progressive drift until middle of the movie, then a reverse drift until the end, where the audio is in sync again.

With SimpleMovieX, you can also resynchronize the movie, but it requires a bit more of work.


You need to divide the movie into sequences and correct sequence by sequence.

In our example, we would determine the point where the audio drift starts to be noticeable. Let's say after 5 minutes.

We would create a Chapter at this point to limit the scope of the synchronization operation. Because we don't want to affect the first 5 minutes.

If you locate the playhead inside a Chapter, the audio sync will only affect this chapter.

So you will correct the drift by the same process as above. The timeline selection turns green where audio sync is modified. The rest of the movie is not affected. See picture.


picResync3.jpeg


Then, we would determine again the point where the audio drift starts to be noticeable. Let's say after 10 minutes. (Becausefirst 5 were OK, and next 5 have just been adjusted)

We would create a second chapter and do the same.


You can create as many chapters as you want and do a really fine-grained resynchronization.


At the end, just delete all the Chapters and save the movie.