LPCM -> mp2 + DTS and no AC3 - will it work?

[vav]

hello,
suppose I'd like to keep the DTS audio in my backup. Volume limitation makes me drop something else, so I figuered I could drop the ac3 audio, but then DVD is out of standart and of course will not be heard on a non-DTS capable system.
My Question is, as subject's revealed, is:
If I make an mp2 file, either downmix the ac3 or the LPCM if exists, make it the x80 track, the DTS as the x89 track - will it be compatible? will it work?

any comment and/or leading me to any useful link is highly appreciated.

[echooff]

Dvd's with only mp2 audio work on all of my dvd standalone players. Located in the U.S.

[vav]

Thanx, echooff, that's reassuring alright.
I'll give it a go.

VAV

[auenf]

altho, LPCM or ac3 is required on a NTSC dvd to make it compliant ;)

Enf...

[vav]

Originally posted by auenf
altho, LPCM or ac3 is required on a NTSC dvd to make it compliant ;)

Enf...

...now I know I don't understand something. :confused:

by 'compliant' you mean 'playable on most settops'?

and if so - does the machine that plays both PAL and NTSC, accept PALs with only DTS audio while spitting out same from NTSC (unless added an ac3/lpcm as you mentioned)??

or maybe 'compliant' is only 'going by the book', meaning actually almost anything goes...??

appreciate a clarification ;)

[oddyseus]

Compliant means "according to specs". Some models may not be able to play a not compliant dvd. It is really up to the programm that handles content's playback.

But u can drop a small 1sec ac3 clip in it and make it compliant anyway, even though u will not use it.

[mpucoder]

Originally posted by vav
If I make an mp2 file, either downmix the ac3 or the LPCM if exists, make it the x80 track, the DTS as the x89 track - will it be compatible? will it work?
If mp2 is track 0 it becomes stream 0xc0, and DTS track 1 becomes substream 0x89.

It would not play any audio at all on my early Sony, which is fully compliant, as support for mp2 and DTS are not mandatory for NTSC players.

[vav]

I see.
So it really comes down to the decoder inside the machine, which leads to trial & error.

btw, that's a nice trick, oddyseus, I'll use it to 'widen' the compatibility just in case...

Thanks a lot guys, learning (and enjoying it) every time.
:cool:

[oddyseus]

How about putting this dummy 1 sec ac3 in track 0 and the mp2 in track 1? We can always force the usage of track1 in ifoedit in every audio selection by the user. Would it then be compatible?

[mpucoder]

NTSC players are not required to support DTS or mpeg audio. That means there are many players out there which do not decode either, and you would not hear anything on them. It's not a question of track order, that was just informative. Mpeg audio is not a substream, as AC3, LPCM, and DTS are, but appears in streams 0xc0 through 0xc7. And while supplying a short AC3 track would make it technically compliant, you still would have a problem. The requirement that NTSC players support LPCM and AC3, and that every NTSC DVD contains at least one track in either of those formats, is to ensure proper playback.

But, of course, if you are just doing this for yourself, compliance doesn't matter. If your current player plays mpeg audio, then there's no problem.

[echooff]

As I stated before all 4 of mine accept mpeg audio, even my most diffucult one - brand name lenoxx. I use this one to test all of my dvds. If it works in this one it will work just about anywhere. After authoring a dvd of a family reunion, I sent 37 copies to my extended family. They all reported the dvd worked in their machines. Most, if not all stand alone players are made outside the US. IMHO it would be more dificult from a production standpoint to to re-engineer just to eliminate the mpg audio for the players. Maybe thats why I am having such success. Anyway, the only way to be sure is to try.