Out Of Sync Problem

[adamf154]

hi, i was wondering if there was a program i can run on a film i have just decrypted using dvdfab, it looks like there may be a small out of sync problem and was hoping to find a program that can run through the film and detect any issues, someone suggested on the download forum that there were audio issues, not sure if it is my eyes or it really is out of sync by a second or 2

thanks in advance for any help

[Alwyn]

For the audio sync, have a look at AVIDemux. It has a "Shift" feature which allows you to move the audio without re-encoding. Set it up like this (put the Output format onto whatever your file is eg MP4).


[Attachment 85214 - Click to enlarge]

The numbers are milliseconds (500ms=1/2 sec).

A Minus value (-) advances the audio, plus delays the audio.

When you're happy, File>Save and your new file will have "edit" appended to the file name.

[adamf154]

thanks for the info but as the post says im looking for a program to detect audio issues, just to check if it is actually out of sync and by how much, it looks like it a bit but im not too sure

[cholla]

This is not exactly what you ask for but an easy way to check by watching the video.
VLC media player will delay or advance the audio 50ms at a time by using the hot keys k or j.

MPC-BE can also do this by 10ms with the + or - keys.

[adamf154]

yeah i use them for tv programes that have been badly recorded and edited and out of sync but this is for films that i plan to keep and would like them sync perfect, cause i will be playing them mostly on my tv and not thru the pc

[cholla]

yeah i use them for tv programes that have been badly recorded and edited and out of sync but this is for films that i plan to keep and would like them sync perfect, cause i will be playing them mostly on my tv and not thru the pc

I made the suggestion for determining the audio offset.
Then use that in a program like AVIDemux suggested by Alwyn.

If you have the experience you could use ffmpeg.
It has a couple of "autosync" features that sometimes work.
With more specific adjustments if you use the correct settings.

The audio sync problem I have never successfully corrected is the progressive out of sync audio.
Unless it was a timestamp problem. Sometimes I have been able to correct it that way.

[Dooby]

Use a free video editor which can separate audio and video tracks and manually shift the audio timeline. If there are defects in the audio this might not work, and you might have to 'cut' the audio in parts, then shift the blocks; or you might have to 'stretch' a block a little. There is no program (not even an AI, yet) which can lip sync. You will have to use your eyes and ears to get it right.