eac3to - audio conversion tool

[mikeyakame]

if the true-hd is outputting in 24bit..try changing the settings for your sound card to 16bit output depth...

im trying it now...ill let you know in a couple of minutes whether it works

edit: nope makes no difference, nero doesn't have a setting for outputs...not sure...ill play with a true-hd track later on

[zgx]

Originally Posted by madshi

Did you have a chance to check out the content of the decoding? Can you confirm that the least significant 8 bits are not zero? It's really too bad cause if true it means that we don't have a 1:1 lossless decoding yet...

No have not gotten around to buy the filters yet so cannot try it myself at the moment. But if you take the original 24 bit PCM file that you got from the decode and then open it in a HEX editor you should be able to figure out if one third of the bits contains zeros (8bit, 8bit, 8bit, 8bit, 8bit, 8bit, 8bit, 8bit...). In an hex editor "00" probably represents 8bit with just zeros.

[Austin Forgotten]

Hi there,

I am very curious about the TrueHD format, as I have spent a considerable amount of time looking at MLP. I do not own any HD equipment to rip HDDVD or Blueray. I have a few questions and I sure would like to get my hands on a demo/test file to have a look. For one, what is the file extension used for TrueHD format? Oh, I suppose I should have asked this 1st.. Has anyone been able to demux TrueHD to a file yet? Anyway if someone could provide a link to a test file [doesn't have to be to large :-) ]. Thanks.

-AF

[zgx]

Originally Posted by Austin Forgotten

Hi there,

I am very curious about the TrueHD format, as I have spent a considerable amount of time looking at MLP. I do not own any HD equipment to rip HDDVD or Blueray. I have a few questions and I sure would like to get my hands on a demo/test file to have a look. For one, what is the file extension used for TrueHD format? Oh, I suppose I should have asked this 1st.. Has anyone been able to demux TrueHD to a file yet? Anyway if someone could provide a link to a test file [doesn't have to be to large :-) ]. Thanks.

-AF

There are a few programs able to demux TrueHD streams out of a HD DVD. The most common is probably EVOdemux available at http://pel.hu/down

I think different programs use different extensions for TrueHD.

At the moment the major problem is that the only way to play TrueHD or decode it is from within EVO files (using PowerDVD for example or now eac3to).

[zgx]

Originally Posted by Austin Forgotten

Anyway if someone could provide a link to a test file [doesn't have to be to large :-) ].

Check your mailbox in a few minutes.

[Rectal Prolapse]

madshi: I just looked at a raw PCM dump and I see the same thing - the 3rd byte of each sample is not always zero! What is going on here...?

[mikeyakame]

this is the info for The Matrix TrueHD track.

Audio attribute :
Audio application mode : surround
Audio format : MLP
Sampling frequency : 48000
Sampling quantization : 24
Number of audio channels : 6
Number of audio streams : 8
Bitrate: 2544 Kbps

I get both 24-bit outputs with this track on Nero Showtime & PowerDVD 7.3.2911

[pasta03]

Someone can give me direct link to Nero Audio Decoder 2 not to all nero recording only for decoder

[Revgen]

Nero packages the recorder and every software it makes together without any separate packages. You cannot get it any other way. At least not legally.

[Revgen]

BTW do Nero's decoders work in Windows XP.

[zgx]

Originally Posted by mikeyakame

this is the info for The Matrix TrueHD track.

Audio attribute :
Audio application mode : surround
Audio format : MLP
Sampling frequency : 48000
Sampling quantization : 24
Number of audio channels : 6
Number of audio streams : 8
Bitrate: 2544 Kbps

I get both 24-bit outputs with this track on Nero Showtime & PowerDVD 7.3.2911

The Matrix TrueHD soundtrack is "1 682 946 322" bytes long. The movie is 136 minutes long. That gives it a bitrate of 1611 Kbps. That's about the same bitrate as a 6 channel 16/48 movie soundtrack compressed to FLAC.

Uncompressed 16 bit/48 kHz/6 channel PCM: 4500 Kbps
Uncompressed 24 bit/48 kHz/6 channel PCM: 6750 Kbps

It's hard to say but I do not believe it's possible to losslessly compress a 24/48 soundtrack from an action movie like The Matrix to 1611 Kbps and the way I see it they must have used a 16/48 source.


People here say that the least significant 8 bits are not zero as they should be. Is it possible that even if the TrueHD track is stored with the least significant 8 bits as zeros that the Nero Audio Decoder reads the 16 bit most significant bits and upsample them to 24 bit?

[madshi]

Originally Posted by Revgen

BTW do Nero's decoders work in Windows XP.

Yes, I'm running everything in XP.

[madshi]

Originally Posted by mikeyakame

this is the info for The Matrix TrueHD track.

Audio attribute :
Audio application mode : surround
Audio format : MLP
Sampling frequency : 48000
Sampling quantization : 24
Number of audio channels : 6
Number of audio streams : 8
Bitrate: 2544 Kbps

Where do you have this information from? Do you have a software which outputs this kind of information? 8 audio streams for MLP is extremely strange because to my best knowledge MLP only supports 6 channels!

FWIW, highdefdigest claims Matrix TrueHD to be 48/16:

http://hddvd.highdefdigest.com/matrix_umc.html

[zgx]

Originally Posted by madshi

Where do you have this information from? Do you have a software which outputs this kind of information? 8 audio streams for MLP is extremely strange because to my best knowledge MLP only supports 6 channels!

FWIW, highdefdigest claims Matrix TrueHD to be 48/16:

http://hddvd.highdefdigest.com/matrix_umc.html

I think the Matrix HDDVD actually has 8 different audio tracks. Look at my reply a few posts up for the information on The Matrix.

[Neo Fagin]

Another unusual error, this time with TrueHD (Matrix Reloaded)

Muxing evo's first audio track to raw. Please wait...
Converting the raw file to wav. Please wait...
sox.exe sox: Channels value '0' is not a positive integer
"sox" reported error code "1". A valid *.raw file was created sucessfully, though.

[madshi]

Originally Posted by Neo Fagin

Another unusual error, this time with TrueHD (Matrix Reloaded)

Muxing evo's first audio track to raw. Please wait...
Converting the raw file to wav. Please wait...
sox.exe sox: Channels value '0' is not a positive integer
"sox" reported error code "1". A valid *.raw file was created sucessfully, though.

Ah, I think that's a bug I introduced when adding support for mono E-AC3 files. I'll upload a fixed build soon.

[Neo Fagin]

Just out of curiosity, what sox/aften commandlines does eac3to use during the conversion process?

[madshi]

Originally Posted by Neo Fagin

Just out of curiosity, what sox/aften commandlines does eac3to use during the conversion process?

Depends on the audio tracks, of course...

Here's version 1.7:

http://madshi.net/eac3to.zip

There's a new option "-8". eac3to can currently not automatically find out how many channels the TrueHD track has, so it assumes 6 channels. If you know it to be 8 channels, use the "-8" option. I'm not sure how many channels Matrix has. Also I'm not sure if Nero's decoder is even able to output more than 5.1. Probably not. So the default (6 channels) is probably the right choice for Matrix, too.

[Neo Fagin]

Nero vision reports Matrix Reloaded to be 7.1 (and says it's unsupported by Nero at this time) but it does play audio despite the error, though I don't know if it's playing 5.1, stereo, mono or what. That may be the cause of the numerous problems the track is causing.

[madshi]

Well, the sox complaint you reported was a clear bug in eac3to. So you should retry with version 1.7. Maybe it works. But I guess decoding will probably be limited to 5.1 channels.