Audio in MKV files goes out of sync when demuxed

[carlmart]

This is the first time this happened to me: an audio track going completely out sync with the video track when demuxed from MKV file.

If played as is, the MKV file is fine. But when I demux it, the video ends up with 01h.56m.33s and the audio track with 02h.01m.31s. A complete mystery.

The program used was MKVextract GUI. What is happening?

[Baldrick]

How did you rip the blu-ray to mkv? MakeMKV?

[carlmart]

How did you rip the blu-ray to mkv? MakeMKV?

No, I'm trying to rip the MKV to DVD.

[Baldrick]

But you are posting in the Blu-ray ripping section...moving you...

[carlmart]

Sorry.

I searched where questions similars to mine were posted, and I thought the place was in Blu-Ray section.

[Baldrick]

Can you post the details from the mkv? Using mediainfo.
And have you tried an all-in-one dvd converter like avstodvd to make a dvd from the mkv directly without any muxing?

[carlmart]

Can you post the details from the mkv? Using mediainfo.

Yes, here they are.

[carlmart]

And have you tried an all-in-one dvd converter like avstodvd to make a dvd from the mkv directly without any muxing?

In fact I did try it in its latest version, but I am not sure if it's working because it opens HCenc but it doesn't fill in the data.

In any case I am doing all these conversions with avisynth now, controlling more variables than AVStoDVD allows to. Particularly audio levels and subtitles.

[carlmart]

Test 1: failed

Right now I tried a different approach: adjusting the audio track length to the video length.

The program I used is Audioscale GUI, but I don't know why the program doesn't seem to be working.

Is there a program similar to Audioscale that I can use to adjust an audio length very precisely?


Test 2: failed

Now I tried doing a negative time stretch with Soundforge. As I have the exact video timing, what I did was load that time as the stretch target.

It got me closer, but it gets out of sync increasingly as I get to the end. I wonder if there's a more precise method for this than trial and error.

[carlmart]

Test 3: worked

This time what I did was down stretch the audio track time to video track time using Soundforge.

There was some out sync yet, which checking with TMPGEnc seemed to be around 7 frames. New correction with Soundforge from original file.

Authored the files with DVDLabPro, and there was a final correction of 100ms that seemed to put things back in sync.

Still not too satisfied, as I am not sure if the stretching shouldn't be more precise, but I don't seem to know how to compute that precisely.

[_MrC_]

In fact I did try it in its latest version, but I am not sure if it's working because it opens HCenc but it doesn't fill in the data.

It could be a little OT, but, what do you mean by "it doesn't fill in the data"? You should know quite well AVStoDVD, because you used to be a diligent user...



Bye

[carlmart]

It could be a little OT, but, what do you mean by "it doesn't fill in the data"? You should know quite well AVStoDVD, because you used to be a diligent user...

How are you? Thanks for commenting over this.

What I meant is that it opens the HCenc screen and it stays there, not filling in the numbers as I think it should. Then starting the conversion. In this case it didn't, at least during the time I waited. Maybe I should wait longer and see what happens.

Now it's been some time that I don't use AVStoDVD for a conversion, as I prefer the more control I can get with avisynth writing my own scripts. But as you see I still go back to it if necessary, particularly to check things I can't understand.

Your tool is VERY powerful, and I do recommend it around a lot, as I think it's the more transparent I could find. Particularly because it uses avisynth.