Avidemux: filter doesn't shift audio

[MovingParts]

Hello,

I have a mpeg4, h.264 file when I play it in any player, it has asynchronous audio. The sound is to early. In avidemux I have no audio at all (like with all other files I ever tried in the last 12 months).
When I hit "audio -> filter -> shift" I tried +70 and I used the settings "video: copy, audio: copy, avi-muxer: mp4". After saving and seeing a conversion bar, the result has the same position as before.

What do I do wrong?


Thanks.

[hech54]

I don't understand.
Do you:

have no audio at all

Or do you have/hear audio but:

the result has the same position as before.

[MovingParts]

1. play file in Quicktime or VLC = audio (but asynchronous, audio starts too early)

2. close file and open it in avidemux editor

3. click play in avidemux editor = no sound at all

4. go to "filter", set shift to +70 and hit save, a new file is created

5. open new file in Quicktime = sound is still where it was before editing it in avidemux

APART FROM THAT:
any file that I will put into avidemux will have no audio, when playing it in the editor. Files will always have audio before the editor and after editing and saving, and opening in other players.

So generally, having no audio is a thing special to Avidemux while playing it in the editor itself. Files will always have audio before and after using avidemux.

In my special case the sound was asynchronous before using Avidemux, so I looked at the time code in Quicktime.
Then I opened it in avidemux and blindly set the shift filter to +70 and save the file. Afterwards, one would expect, that the sound has moved, but it is where it was before.

[hech54]

You need to find out exactly what kind of audio is in that file. I personally rely on OLD versions of AviDemux. I'm using 2.4.4. right now.

[MovingParts]

96Kbps, 44.1KHz, 2 channels, AAC (LC)

But how would that help me? (choosing copy should copy)

I now tried mpegstreamclip 1.9.3b8 (first save audio and video seperate and cutting same amount of ms at the end of audio and at the beginning of video then put both together and save in the same format). Last time I tried this with anther movie in mpegstreamclip 1.9.3b5 I always had to change mp4 to .mov, when putting together the two tracks, but beta8 seems to have solved this.

[hech54]

96Kbps, 44.1KHz, 2 channels, AAC (LC)

But how would that help me? (choosing copy should copy)

You keep saying "no sound at all" in AviDemux. How is it going to fix what it can't see/recognize/work with?

[hech54]

Oh and "+70" shift is almost nothing. I start at +-150 and work from there. Of course you would need to HEAR the audio to TEST to see if the change is enough or in the right direction.

[MovingParts]

96Kbps, 44.1KHz, 2 channels, AAC (LC)

But how would that help me? (choosing copy should copy)

You keep saying "no sound at all" in AviDemux. How is it going to fix what it can't see/recognize/work with?

I meant, how does it help me to know what exact audio type it is, if Avidemux is set to just copy it (and apply shift).

[MovingParts]

Oh and "+70" shift is almost nothing. I start at +-150 and work from there. Of course you would need to HEAR the audio to TEST to see if the change is enough or in the right direction.

Generally, not speaking of this particular case: whenever I open a movie file in Avidemux and hit play to watch it inside Avidemux, I can hear no sound. Of course there is an audiotrack, that can be selected at the left, but there is no sound audible. When I then edit it and make Avidemux create a new file out of it, the resulting file will have audio, when played in VLC or Quicktime or mpegstreamclip. Remember the sound was audible in the preexisting file and is audible in the created file, but not while editing the file.

In this particular case, the answer why I hear no affect is, that +70 is not enough. Of course I did not listen to the file in Avidemux. I applied +70 and saved the file and then opened it in a real mediaplayer (no editing tool). If I now try +400, it can very well be, that I will hear that the sound has been shifted.

I will have to always edit and save the files out of Avidemux to see what the number typed in the shift field has done to the movie.
[Attachment 33526 - Click to enlarge]

[hech54]

Oh and "+70" shift is almost nothing. I start at +-150 and work from there. Of course you would need to HEAR the audio to TEST to see if the change is enough or in the right direction.

Generally, not speaking of this particular case: whenever I open a movie file in Avidemux and hit play to watch it inside Avidemux, I can hear no sound. Of course there is an audiotrack, that can be selected at the left, but there is no sound audible.

I just don't understand how you expect to repair the audio sync if you cannot hear the audio in the tool you are trying to fix the sync in. You can't just keep punching in numbers and saving over and over again till it turns out.
Find and fix the "cannot hear the audio" problem and you'll be done in a matter of minutes.
PS - I always make it a habit of pressing STOP in AviDemux each time after I change the sync values then re-listen.

[MovingParts]

[QUOTE=hech54;2408754]

You can't just keep punching in numbers and saving over and over again till it turns out.

That's what I planned to do.
Are the number sin the shift field anything human readable, like milliseconds or so? Then I could just play the file in another player and write down the delay.

[hech54]

Again. Figure out why you cannot hear your audio in AviDemux so you can adjust the audio WITHIN Avidemux.
Google it. Something like this perhaps?
https://forum.videohelp.com/threads/356484-Avidemux-no-audio?p=2245957&viewfull=1#post2245957

[MovingParts]

Thank you! That solved it!!!

[hech54]

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