audio out of sync

[natty]

Hi all I recorded a video on my bike camera, but the audio is not in line with the video. as I pressed my bike horn at someone I know, but it didn't sound until I was well past my friend like much further down this road. what's best easy program to line up the audio with video

my video is a AVI

[ProWo]

Use VLC player to find the correct delay (Tools, Track synchronization).
Once you have found the correct value, use clever FFmpeg-GUI to remux your AVI file with this value.
(Main page, multiplex, insert the found value in the delay column of the audiostream, set avi as container, click multiplex. Done).


[Attachment 88697 - Click to enlarge]

[Alwyn]

AVIDemux should do it. Use the audio "shift". Set it up like this (adjusting the shift as necessary, of course); note Video>Copy, Audio>Copy, Output Format AVIMuxer:


[Attachment 88701 - Click to enlarge]

You can only change the shift value with the video stopped ie not playing.

[natty]

AVIDemux should do it. Use the audio "shift". Set it up like this (adjusting the shift as necessary, of course); note Video>Copy, Audio>Copy, Output Format AVIMuxer:


[Attachment 88701 - Click to enlarge]

You can only change the shift value with the video stopped ie not playing.

where do you use the audio shift. oh i think I can see now its on -500 but then do I play video then save or just save while its paused

just tried -500 saved while it was paused but its still same

[natty]

Use VLC player to find the correct delay (Tools, Track synchronization).
Once you have found the correct value, use clever FFmpeg-GUI to remux your AVI file with this value.
(Main page, multiplex, insert the found value in the delay column of the audiostream, set avi as container, click multiplex. Done).


[Attachment 88697 - Click to enlarge]

I dont have a clue how to do all this at all Im a newbie I did the tools thing


[Attachment 88702 - Click to enlarge]

[Alwyn]

just tried -500 saved while it was paused but its still same

Just do a File>Save. It works here.

Here's the MediaInfo readout of the delay I saved in my file:


[Attachment 88704 - Click to enlarge]

[natty]

[Attachment 88705 - Click to enlarge]


its still well out of sync no different

[cholla]

This topic has some useful information on this.
https://forum.videohelp.com/threads/418951-How-to-fix-out-of-sync-audio-track?highlight=audio+delay

[hech54]

AVIDemux should do it. Use the audio "shift". Set it up like this (adjusting the shift as necessary, of course); note Video>Copy, Audio>Copy, Output Format AVIMuxer:


[Attachment 88701 - Click to enlarge]

You can only change the shift value with the video stopped ie not playing.

where do you use the audio shift. oh i think I can see now its on -500 but then do I play video then save or just save while its paused

just tried -500 saved while it was paused but its still same

Then try a + value. Change the value, PRESS STOP, the PLAY again to check the result. Once it's matched up, COPY COPY SAVE (AS).

[Alwyn]

Minus (-) values bring the audio forward so it plays earlier. Positive values delay the audio.

Be methodical: start with 500, then go to 1000, then 1500 and so on to work out whether the sync is getting worse or better. Then go back to 0 and try the other way, with minus values. It can be tricky to work out which way it is. Try to find a sharp noise, or a period of silence then somebody starts speaking. That will make it easier to work out which way the offset is.

And be ready to "fine-tune"; quite often, you'll notice out-of-sync of only 200ms (which is 5 frames of video at 25fps), so once you get close, change your increments down to 200ms or less.