AC3/DTS/MP2/SDDS/LPCM file to WAV file ???

[Dark-Cracker]

Can someone could explain me clearly how to convert the AC3/DTS/MP2/SDDS/LPCM file to an Wav file ?

- For the .ac3 file i use beesweet
- For the .mp2 file i use beesweet with -mp2file input
- For dts/sdds/lpcm stream which too i need to demux ? and for converting ?

Thank u for your answers :-)

PS: sorry for my bad english.

[DSPguru]

i don't know of any dts/sdds decoder :(.

as for lpcm, the situation is tricky,
lpcm could be lots of things (44.1khz/48khz/96khz , 16bit/24bit ,.. )
and the situation is tricky because its simply a raw of samples without side information about the samlpes format.

there are some tools (don't remember which) that adds a wav header when extracting the lpcm stream. in that case - problem is solved.

[Dark-Cracker]

Thank u for the answer, i have ask this question because i don't understand why dvdripper could demux stream like dts/lpcm/sdds while u can't use these files.

Thank u for the answer.

PS: it seems to me that if you want convert a .mp2 file to a .wav you should resample it to 44.1 Hz because MPEG Layer 2 has a bug is it right ?

[evilhomer]

if your sound card can play it, total recorder can record it. it acts as a passthrough.

[Tes]

Except that when you record decoded DTS with Total Recorder it sounds like sh*t (at least it does using my SB Live).

[Sherlock Holmes]

You sure ?
You mean SB Live can play DTS files ?
I didn't find anything about it. Just I found that it can play DolbyDigital files. So if it can , how ?

[evilhomer]

maybe it can play them, but not in DTS. could explain his problem with total recorder.

[MaTTeR]

Depending which SB Live! card it is, some are capable of "passing" DTS via SPDIF.

[evilhomer]

you are correct, i didn't think about that. have no idea how total recorder handles SPDIF...

[Antimon]

Well powerdvd can decode dts and then youc an record your waveout if you're desperate.

voborator .2 can suposedly convert dts to pcm....though i dont see the point really...isn;t dolby digital enough quality for you? :-)

[Tes]

Sorry I didn't clearly explain my problem with total recorder. When I was using Windows 98SE I installed and used total recorder to record decoded DTS sound using the Intervideo audio filter (iviaudio.ax). The problem was that there was static like noise added in the background throughout the whole recording. I later noticed that all sound files that I played after installing total recorder had this static noise effect. After uninstalling total recorder everything was fine.

Originally posted by Sherlock Holmes
You mean SB Live can play DTS files ?

No, the Intervideo filter decodes the DTS files. Then the soundcard outputs the decoded signal.


Just to clear thing up I was not trying to record the SPDIF passthrough output of my soundcard ;), although I do pass coded DTS over SPDIF when I watch a DVD.

[Tes]

Originally posted by Antimon
voborator .2 can suposedly convert dts to pcm....though i dont see the point really...isn;t dolby digital enough quality for you? :-)

Almost all of my Divx encoded movies have AC3(DD 5.1) sound. The point of trying to decode a DTS track would be to create a new sound file with higher quality sound than the AC3 track on the DVD and that would also take up less space. AAC and Vorbis could probably create stereo (and maybe multichannel) files that beat AC3 in both filesize and sound quality if they were created from a DTS source.

I'll have to check out VOBrator :)

EDIT: VOBrator converts DTS into PCM DTS (a DTS WAV file like those made by Surcode CD DTS) no actual decoding is done :(

[Antimon]

ah i didn;t knwo it made pcm dts, i thought ti wa sjust pcm, hmm

I dotn find much differnce bewteen dts and ac3.....abotu all dts does for me is it seems to be more sensitive to overloading speakers, it's a little sharper but nothign that i can hear blidnly withotu payign attention

without doign a/b comparison i can't tell them apart.

And the encoded oogs i've done form ac3 sounds fine, i dont see the need to go with a higher quality sorce, any gains are goign to be lost right away as soon as you encode it.

[MaTTeR]

Originally posted by Antimon
abotu all dts does for me is it seems to be more sensitive to overloading speakers, it's a little sharper but nothign that i can hear blidnly withotu payign attention

What kind of sound system are you listening to DTS tracks with? You should be able to hear a noticeable difference even on a low end home theater system.

I doubt we'll ever see any type of software decoder for DTS ripping purposes. It's been discussed heavily by some of the best audio gurus around the community but it seems to be a dead end.

[Antimon]

It's a kenwood 5.1
600 watts
100xchanal is the amp rating, the included sub is only rated at 50 *weak weak....*

Does the dts soudns better? Yeah a little bit......does it blow away ac3? No, is it worth mor emoney for he dts version of the film and/or cutting of special features? I don;t think so.

The ac3 doesn't sound "bad" or "incomplete" or "compressed"

It's like yeah i know wavs are better then 128 mp3's...am i goign to download a 44 meg wav ? no, i'll get the 3.8 meg mp3

cus the quality:size ratio isn;t worththe extra investment to me

If a dts track is available i'll listion toit enstead, but i don't get depressed when ther ei sjust a 5.1 ac3, it's not a huge differnce.

[Boost]

The thing is that when I buy a DVD and there is a DTS version I go for the DTS version. The downside of it is ripping. All my DTS movies (except T2, Gladiator and the Superbits) there are a two channel dolby digital track. But we all want 5.1, don't we? ;-)

I don't care that some "audio guru" has claimed the DTS decoding issue a dead end. If one can crack a program one should be able to track down what happens to the DTS decoder in software DVD players and be able to mimic it but rather extract the sound to files instead of the soundcard.

An alternative would be to write a virtual sound card driver that accepts 6 channel audio and that feeds the data to a file instead.

A third alternative would be to capture the AC3 output of an nForce chipset if it is any good and then just mux it in with an AVI.

[Antimon]

Ahhh see, all the dvd's i have with dts, also have a 5.1 dolby digital track as well, and often others, lek a 2.0 track, and such.

See if i can get dts for free sure I'll go for it...if I have to sacrifice special features like making of, cus dts is larger, or if the dts verssion is $29, when the dd is $19 or $24, i go for the dd :-)

Partly due to my computer 5.1 system not suporting dts, but only pro logic and DD, powerdvd decodes dts but thats only downmixed ot suround in my case.

the livign room amp is dts capable and i pick it when available :-)