DVD-RB: How can We Change Audio?

[digitall.doc]

Hi all,
long time since my last post... too busy now.
Well, I've been reading about Rebuilder and I thought to give it a try.
I'm just begining so I maybe missed something. I wonder,
is there a way to reencode audio, and substitute an audio stream with our reencoded one?.
To me it looks like DVD-RB just keep the original streams. What I want is, related to film audio tracks, keep spanish as original (sometimes I reencode from 448 to 384 kbps) and reencode english from 5.1 to 2.0. This way I can earn some megas to give the video film more quality.

Do you think that's possible?. If yes, How?.

[Dialhot]

Quote:

Originally Posted by digitall.doc

I wonder,
is there a way to reencode audio, and substitute an audio stream with our reencoded one?

No. No action is performed on the audio and the streams are just copied "as this". No way to change that.

[digitall.doc]

Hmmm... I was afraid of this.

Maybe I could take the vobs, demux audio, reencode audio, mux back and then DVD-RB... but it sounds like a too long process .

If I find the time, I'll try once at least and see if it does worth the difference in Q I can get this way for main movie.

[gamma]

I do the following, because i also want to reencode video, audio and sometimes add subtitles to a dvd, while keeping the original menu's.

Make the d2v file as usual. Reencode the audio. Now you should know how many space is left for the video.
Encode the video as kdvd, using the avg bitrate aquired from calcumatic (i use 2-3 pass cce). Now author the kdvd with (for example) maestro, adding the reencoded audio and the subs. You can also easily author a dvd with ifoedit, it's fairly fast.

When the muxing is done, replace the original .vob files which contains the movie with the vobs you just authored. Carefull, only replace the vobs which contain the movie, or else you will loose your menu. It can happen that you have to rename your authored vob files.

Now, use IfoUpdate to update the ifo files, and you have your custom made kdvd with reencoded audio and the subs you wish.

To make shure the menu still works correctly, write down which stream number is English language (for example) and which stream is the sub you want to use. When authoring, make shure your audio track has the same stream number as noted from the original dvd. You can do this very easily using Ifoedit on the original dvd.

Looks like alot of work, but it's worth it.

[jorel]

Quote:

Originally Posted by digitall.doc

I wonder,
is there a way to reencode audio, and substitute an audio stream with our reencoded one?.
Do you think that's possible?. If yes, How?.

2 ways...
my Hard way: http://www.kvcd.net/forum/viewtopic.php?p=65306#65306

or changing the default audio stream in dvdshrink
before start dvd-rb (or any other encoder or program)...
see nwg posts (big details answering me):

http://forum.digital-digest.com/show...threadid=40729

[digitall.doc]

Gamma, Jorel,

just a fast post to thank you (very late ) for your suggestions and help.
Gamma, what you suggest is similar to something I thought could be a way (but too difficult):
- demux original film vobs
- reencode those audio streams I want (employing lower bitrate)
- remux vobs (reencoded audio, original m2v film)
- use DVD-RB as usual

Tools? need help
- VOBedit to demux
- Softencode or Besweet to reencode audio
- IFOedit to remux

What do you think about this?.

BTW Jorel, thanx a lot. You also gave me interesting ideas.

[jorel]

Quote:

Originally Posted by digitall.doc

Tools? need help
- VOBedit to demux
- Softencode or Besweet to reencode audio
- IFOedit to remux

What do you think about this?.

BTW Jorel, thanx a lot. You also gave me interesting ideas.

Tools? are ok ! my taste is: Softencode or HeadaAC3he
what i think? very very cool!

hint: you can put 8 audio tracks if you want, no matter if some of that tracks are 5.1, 2.0 or mp2....recomendations are 192 for mp2 but i read (a lot) that you can use differents bitrates.
now i'm curious.. what ideas do you have?

[digitall.doc]

Quote:

Originally Posted by jorel

hint: you can put 8 audio tracks if you want, no matter if some of that tracks are 5.1, 2.0 or mp2....

Good tip. Thanx.

Quote:

Originally Posted by jorel

recomendations are 192 for mp2 but i read (a lot) that you can use differents bitrates.
now i'm curious.. what ideas do you have?

Well, I'll tell you what I usually do (for sure it is improvable...). I usually author my KDVD (2 films per DVD-R) with 2 audio tracks:
- Spanish: I use the original ac3 5.1ch. If bitrate is 448 i reencode to 384kbps... and sounds great to my bad trained ears .
- English: I take the original ac3 5.1ch (or take ac3 2.0ch if available) and first downmix with headac3he ( ) to wav 2.0ch and then with softencode to ac3 2.0ch 128ch (too low?, good for my purpose).
From time to time softencode refuses to load the wav, and I have to downmix and reencode with besweet.

Don't say that I didn't warn you it could be improvable...

And now a doubt (I know, instead of asking I could go and test, but I have so little time at the moment that I prefer to have the proccess clear in my mind, before testing. Sorry): if I redo vobs the way I said, will I have to use the original ifos, or the redone ones?. If the later, how will I keep original chapters?, should I use Ifoupdate, or what then?.

Thanks in advance.

[Dialhot]

Quote:

Originally Posted by jorel

Tools? are ok ! my taste is: Softencode or HeadaAC3he

Does someone manage to have a 5.1 output from Headac3che ?
Because all I can obtain from it is a bullcrap 2.0 ac3 !
(reported by DVDLabPro).

[incredible]

Did you try to encode via ....

a) ... the latest beta of Headac3he ?? (I do think so)

b) ... besweet.exe and the latest ac3enc.dll (commandline IN DVDlabPro as external engine)

c) ... ffmpeg.exe (also here as commandline IN DVDlabPro as external engine)

??

No matter if using Headac3he, Besweet or ffmpeg .... all do use the liba52 AC3 generating core from ffmpeg. BUT it depends which build of that core was used to generate the ac3 encoing .dll ! Thats the point.

In case of mp2 -- Besweet (via mp2enc.dll) and Headac3he (also via mp2enc.dll) are the same in their result. Maybe only in case of downmixing they "could" use diff. values -- but both do use in such a case again the same azid.dll


BTW: When I used Packshot (ac3 via besweet and latest ac3enc.dll) there was no problem with DVDlab Pro

[jorel]

@ Phil
please, don't start to argue without read the thread!

digitall.doc was asked:

Quote:

Originally Posted by digitall.doc

Tools? need help ...
- Softencode or Besweet to reencode audio

THEN i asnswe:

Quote:

Originally Posted by jorel

Tools? are ok ! my taste is: Softencode or HeadaAC3he

i wrote that MY taste is HeadAC3he and not besweet! we was not posting abouy 5.1 ..we was talking about

Quote:

Originally Posted by digitall.doc

and reencode english from 5.1 to 2.0. This way I can earn some megas to give the video film more quality.

Do you think that's possible?. If yes, How?.

this....the headac3he is for this situation! to earn some megas to the video.

now WHY you're quote my answer posting that?

Quote:

Originally Posted by Dialhot

Quote:

Does someone manage to have a 5.1 output from Headac3che ?
Because all I can obtain from it is a bullcrap 2.0 ac3 !
(reported by DVDLabPro).

read what is wroten ....forum is for write and for READ!
:P

[jorel]

Quote:

Originally Posted by digitall.doc

And now a doubt (I know, instead of asking I could go and test, but I have so little time at the moment that I prefer to have the proccess clear in my mind, before testing. Sorry): if I redo vobs the way I said, will I have to use the original ifos, or the redone ones?. If the later, how will I keep original chapters?, should I use Ifoupdate, or what then?.

all your answers are here:
http://www.kvcd.net/forum/viewtopic.php?p=65306#65306

like i wrote there:

Quote:

Originally Posted by jorel

seems complicated?!?!
no,it's not....if i did you can do too!

don't be like Phil.....read what is wroten!

(now Phil will be mad)

[incredible]

@ Phil

http://www.videohelp.com/tools?tool=AC3Fix

A interesting User report from "lechtin":

Quote:

Originally Posted by Lechtin@vcdhelp.com

Good tool. If you have problems with an AC3 stream, give it a try. I had a stream that DVD-Lab could not read properly and that failed during the DVD compilation. I ran the stream through this tool and even though it reproted that no errors were found, it still generated a new file which I used successfully. I still don't know what was wrong with my old file, but it was probably not a bad frame and AC3Fix still corrected it.

[Dialhot]

Quote:

Originally Posted by jorel

@ Phil
please, don't start to argue without read the thread!

Here we go again

Quote:

now WHY you're quote my answer posting that?

Because I'm free to act as I want, when I want and the way I want.

It is not because what you just said make me think about a question I had in mind since a long time that I DID NOT READ THE THREAD.

One day, perhaps, you will understand that people can act in a different way that the one that please you and they are free to do that.
(even if opening a new thread would have been a better idea).

@Inc
What ac3fix has to do with this ? I use it since a long time and I don't understand why you send me this link now ?

[jorel]

Quote:

Originally Posted by Dialhot

One day, perhaps, you will understand that people can act in a different way that the one that please you and they are free to do that.
(even if opening a new thread would have been a better idea).

if i understand?..... seems "middle" smart answer Phil!
i was answering exact what digitall.doc ask:

Quote:

Originally Posted by digitall.doc

Tools? need help
- VOBedit to demux
- Softencode or Besweet to reencode audio
- IFOedit to remux

What do you think about this?.

he ask for opinions,.....and i did my opinion!

now.......my doubt:
do you THINK that I'M FREE TOO to post my opinion after he ASK ME
:P

or no?
what you understerstood about your phrase now
answer me... i'm free to do that or not?

don't bore yoursef...it's just one(kidding) question!