DTS audio cd reallp possible???

[slodki]

Hey, i want to make a backup copy of the audio of my concert DVD's, so that i can play them in my standlaone in AC3 or DTS format. I know its possible becuase there is a website that tells you how to do it (http://www.labdv.com/en/examples/cd_audio_dd.php) THe only problem that i am having is thati have to extract the ac3 stream of the concert and downsample it to 44.1 Hz adn then burn it as an audio cd in eaither ac3 or dts format. I have this one convert called the Eagles:Hell freezes over, adn it only has a PCM and a DTS audio stream, no ac3 stream. So ive been thinking is there any programs available that can downsample a dts stream from 48 to 44.1 Hz? After that then i coud burn it as a audio cd and it would work. So rry for ranting on like this, and i dont even think that youll understand what im talking about, but if anyone can help me then i would appreciate it alot. Thanks you :D

[DSPguru]

hi slodki !
try demuxing the pcm stream. if it's a 6ch stream - problem solved.

about the link you post of how to convert DVD AC3->CD DTS...
wait for tomorrow, for the release of BeSure & latest BeSweet.
BeSure is a wonderful frontend that uses BeSweet & SurCode DTS to create CD-DTS very fast and very easy.
BeSweet decodes the AC3, resample to 44.1khz, normalize (if set), and split the channels to 6 different wavs. then, SurCode creates the DTS track.

[DSPguru]

if you feel like beta-testing...
you can download BeSweet v0.96a (http://dspguru.notrace.dk/BeSweetv0.96a.zip) & BeSure (http://dspguru.notrace.dk/BeSure.zip).

[LigH]

Originally posted by DSPguru
if you feel like beta-testing...
you can download BeSweet v0.96a (http://dspguru.notrace.dk/BeSweetv0.96a.zip) & BeSure (http://dspguru.notrace.dk/BeSure.zip).

He DSPguru, don't you ever get tired to make new toys? :D

(That's no complaint - keep going well! :p )

[DSPguru]

Originally posted by LigH


He DSPguru, don't you ever get tired to make new toys? :D

(That's no complaint - keep going well! :p )
LOL :D

DTS-CDs is why i got here from the first place !
btw, BeSure front-end was written by dvd2svcd, not me.

[slodki]

Hey, would i be able to use besweet to decode the pcm stream, downsample it and then normalise it. Then use that surcode-dts to make a dts wave?? I would use besweet for my other concerts which have ac3 streams, but my main question is can i use this program with a psm stream adn do exactly the same that i would with an ac3 stream. Thanks, sorry if it such a stupid question :D

[DSPguru]

ATM, BeSweet only supports WAV for input and not PCM (same as wave, just without header).
if you'd add to the pcm a WAV Header, you could normalize, downsample, and also compress dynamic-range.
first thing to do - check if the pcm of the Eagles is 2ch or 6ch!

[ChristianHJW]

Originally posted by slodki
So ive been thinking is there any programs available that can downsample a dts stream from 48 to 44.1 Hz?

... sorry if i missed something of importance here, but how could you demux the DTS stream from the DVD ? Smartripper cant do that to my knowledge ? How do you convert it to a 6 ch WAV ?

[DSPguru]

vstrip/bbdmux/vobrator can demux the dts stream.
but i don't know of any accesible dts decoder.. :(

[Taric25]

Couldn't you just take the DTS track and put it to CD direclty? I know it's 48kHz, co could it be played in a DVD player and still give surround sound?

Also, how much DTS audio can you fit on a CD?

[DSPguru]

usually can't put dts track on a cd. 'cause most dts tracks on dvd are 1.8mbps, while cd can hold up to 1.5mbps.
if i'm not wrong, SurCode's output is 1.2mbps DTS and therefore works.

[slodki]

Originally posted by DSPguru
ATM, BeSweet only supports WAV for input and not PCM (same as wave, just without header).
if you'd add to the pcm a WAV Header, you could normalize, downsample, and also compress dynamic-range.
first thing to do - check if the pcm of the Eagles is 2ch or 6ch!

Ok i have checked if the pcm of teh Eagles concert is 2ch or 6ch, and it is 2ch. Is this gonna make a difference and would i be able to make it into 5.1 surround?? I dont think that i would, so is there anything else that i can do???

[Tes]

Hi slodki, the best quality sound on the DVD is probably the 2ch PCM track. If you want to make an audio CD that you can play anywhere this would be the best track to use. If you really want the DTS track you could try burning a portion of it to a CDR and see if you can play it back on your audio equipment.


usually can't put dts track on a cd. 'cause most dts tracks on dvd are 1.8mbps, while cd can hold up to 1.5mbps.

Do you mean that the CD player will not be able to read the DTS track on the CD fast enough to play it back properly? If space is the problem he could always use 2 CDs if all of the DTS track will not fit on one.

Tes

[slodki]

Yes thats a very good idea i will try it now, and will post what happens...

[slodki]

Ummmm...this is going to sound very stupid. But when i tried to burn a 160 meg dts file that i extracted from the first concert vob file it wouldnt work. Im using the newest version of Nero, and at first i treid to burn it as an audio cd, but nero said taht it couldnt identify it, so i decided to burn as CD-ROM (ISO), but for some starnge reason when as soon as it starts burning the progress quickly jumps to 10% and then my HD starts reading like crazy and the only thing that i can do is to reboot my machine, good thing im using cd-rw or else i would have alot of coasters :D Can anyone sugjest a program, or a way in Nero to burn this DTS file to a cd. Maybe i should format my computer, as i have a couple of viruses, adn trojan horses lying around :D, Im just too lazy, if there is no other solution then im afriad that ill have to format.

[DSPguru]

hi Tes & slodki,
sorry to tell you, Tes, but the only way to backup your DVD audio, At the moment, is to downsample the pcm stream to 44.1khz and burn it as a plain CDDA.

why can't u burn the dts ? i'll explain...
CDDA players have a constant bitrate, they ALWAYS play 44100*16*2bits/sec ~= 1.5mbps.
if you want to replace the payload of samples into something else (ac3/dts/mp3), you would have to make sure that your stream is equal or less than 1.5mbps.
further more, if your stream's bit-rate is less than cd's bitrate, you would have to use zero padding between frames in order to reach the exact bitrate.
that's not all, in most cases you would need to convert from little endian to big endian, and also add spdif commands at the start of every frame.
to make things short : 1.8mbps dts can't be burned as a cdda!
if you'll find a program that is able to transcode 1.8mbps dts to 1.2mbps dts, i will write a program to convert the dts stream into CDDA-compatible wav.

btw,
yesterday i used BeSure to create a backup of Santana's live-concert. got very nice results.
today i'll backup my DVD of "The Who" :D
Tes,
did you try using BeSure on a AC3 soundtrack ?

[Tes]

Hi DSPguru, I have not used BeSure on an AC3 soundtrack before. But I have copied an AC3 track to a CDR. Since the only place I have to playback music or movies is on my computer, I just burned the *.ac3 file as a regular data file. :p

And I can play it back using the SPDIF output of my soundcard to my AV receiver.

slodki,
You can use the sample found at the following site to see if you equipment can play back a DTS-CD: http://www.minnetonkaaudio.com/Download_DTS_Recording.htm

I downloaded the file and burned it to a CD as per the instructions but it would not work for me. My CD player kept trying to interpret the data as PCM so all I heard was a bunch of static :(

Tes

[slodki]

Hey, i am pretty sure that my recievier can handle dts audio, as on another concert that i copied i encoded it as a dts file adn played it. The receiver displayed dts 3/2 and started playing, so i know that it will work. How did you just burn the ac3 file onto the cd??? Becuase i am using Nero and when i tried to burn as a CD-ROM (ISO) it didnt work. As soon as i pressed start, the progress suddenly jumped to 10 percent, adn then teh HD started reading like crazy, and the only thing that i could do was to reboot my system. Maybe i should use another program to do this??? How did you burn your ac3 file onto cd adn with what program and what settings :D

[Tes]

I just used the old Adaptec Easy CD Creator 4 (it came with my CD burner). Select the data CD layout from the file menu, add the files you want to burn, and then press the Create CD button. ;)

BTW, the link I mentioned before was for testing if a standalone CD player could read a specially formatted Audio CD that contained dts information (rather than PCM) and send it to the proper receiver/decoder where it should be interpreted as dts. In my case I can play DVDs with dts tracks just fine, but when I try playing the Audio CD I created using the test file I cannot get dts playback.

Tes

[slodki]

Thanks for the info, ill try burning it later, know your saying that when you play dts dvds it plays fine but when you try to play your cd with dts on it in you cd-player it wont play (?). Well i had the same problem, my cd player (which is connected to my reciever) wouldnt play the dts track, so i put it in my dvd player, and it worked perfectly, maybe this is not what you need but, at least i gave it a try :D