Stretch 25fps AC3 to 23,976fps?

[masken]

Hi

Got two versions of a movie. One HD-version with English audio, and one DVD with Swedish audio. I've extracted the Swedish AC3 audio from the DVD using DVD Decrypter in IFO mode.

Now I want to add the Swedish audio track to the English HD MKV-file.

I've looked around a bit, and first tried to stretch the audio with audioscale. After merging it with mkvmerge GUI, I got the sync conversion correct but audioscale seems to introduce annoying pulsing noise in the audio track.

Tried using mkvmerge GUI's "Stretch by" feature and tried specifying both 25/23.976 and 1001/960, but neither provided a completely correct sync (sync off by 0 in the beginning, about 1,5 secs in the end of the movie). Reading the manual, it says it works best with video and subs.

Anyone with clues?

[tebasuna51]

Use eac3to:

eac3to input.ac3 stretched.ac3 -25.000 -changeTo23.976 -448

If still don't work means than the mkv video is not the same than the DVD video.

[doom-nine]

Besides tebasuna51's method, you can also use:
eac3to input.ac3 stretched.ac3 -slowdown -448

[masken]

Thanks, tried this and it works, but there's still some off-sync at the end (which wasn't the case with audioscale)... :-/