Does edit a DD 2.0 Surround track remove the surround?

[Falcon]

Yeah, you can, but I am not sure if it's exactly 20ms, that's just from my memory. It might be a different value in actuality.

Just read the manual or google instructions for Delaycut, it's not too complicated. Basically, you can cut off parts from the start or end and you can "glue" together two .ac3 files too (though I'm sure that requires them to have the same properties like channel layout etc., or else it would mess with the result).

Also, just saw the question in your title ... yes, you can edit (as in cut) without losing surround information. Check out "Dolby Stereo" on wikipedia. The surround comes from an analogue matrixing algorithm which is explained in the wikipedia article. It being analogue results in it not really being affected by digital compression too badly. With that said, I wouldn't play around too much with EQ etc. personally, because I think that could potentially mess with the phase of the signal and so on and possibly compromise the ability to dematrix the signal to surround. Though I suppose if you wanted to do such editing, you could dematrix, then do your edit, and then rematrix (or just keep it as 4.0/5.1 or whatever).

Thank you!


Do you have a good software for dematrix surround?


How can I sync the waveforms ?

[deleted user]

There are some softwares around, one is a foobar2000 plugin and another is a Surcode decoder. Probably some other ones I don't know about. Personally I use a hardware decoder, the Dolby SDU4.

Sync Waveforms: Find reference point on waveform, find the same reference point in the other clip. Note exact times in each clip. Calculate sync difference.

Or just straight up load them in a DAW and sync them up by hand, but then you will definitely have to reencode, so it's pointless for this.

[CSchmidlapp]

Do you have a good software for dematrix surround?

Have a quick read through this thread Falcon.

https://fanrestore.com/thread-2133.html?...y+surround

[spoRv]

@Falcon: if it's just a delay program - so, no conversion from PAL - why don't just remux video and audio with such delay? TSmuxeR allow that (.ts/.m2ts), as well as MKVtoolnix and other softwares.

[Falcon]

There are some softwares around, one is a foobar2000 plugin and another is a Surcode decoder. Probably some other ones I don't know about. Personally I use a hardware decoder, the Dolby SDU4.

Sync Waveforms: Find reference point on waveform, find the same reference point in the other clip. Note exact times in each clip. Calculate sync difference.

Or just straight up load them in a DAW and sync them up by hand, but then you will definitely have to reencode, so it's pointless for this.

Ok thanks An example of software for sync waveforms please?

Do you have a good software for dematrix surround?

Have a quick read through this thread Falcon.

https://fanrestore.com/thread-2133.html?...y+surround

Thank you, I had already read this thread, but the software solutions do not seem as good as hardware solutions of what I read

@Falcon: if it's just a delay program - so, no conversion from PAL - why don't just remux video and audio with such delay? TSmuxeR allow that (.ts/.m2ts), as well as MKVtoolnix and other softwares.

It will not pose problems of compatibility on an iso bluray? :-O

[zoidberg]

Check out this thread:

https://fanrestore.com/thread-1587.html

Basically using an editor like audacity sync your AC-3 file and keep a log of your edits (remembering AC-3 has 32ms frames), once completed use the edit log to losslessly edit the AC-3 file in eac3to. It will add/remove frames without re-encoding.