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Author Topic: asio wma 5.1  (Read 3252 times)

liofr

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asio wma 5.1
« on: June 18, 2007, 03:05:05 pm »

my home cinema have
i use my pc as a home cinema
i use a usb edirol ua 25 box
i use a basic home cinema device that have 3 input connectors (spdif coaxial, spdif optical, stereo input)
pc<-usb->ua 25 <-stereo-> homecinema <-coaxial->6 HP
......................<- spdif  -> homecinema /                   
             
1) stereo
i can  listen web radio/ audio using asio4all and stereo output connector of my edirol ua25 usb box for listen in my home cinema
2) 5.1
i search a tool/software that let me listen wma 5.1 audio format embedding in wm HD using the spdif optical connector output of my edirol ua25 usb box .Does jriver support multichannel output of dvd or wmv HD . Does asio could be use to achieve this ? Does jriver need a external tool to hear audio / redering image.

Don't buy at this time jriver even test with my pda ( very gui friendly) but wanted feedback about audio and video suppport before buy jriver
Thank's for alls informations

thank's
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mlefebvre

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Re: asio wma 5.1
« Reply #1 on: June 25, 2007, 06:57:40 am »

Hi,

I'm interested in this also, but maybe if you posted this question in the Media Center 12 forum, you would have a better chance at an answer.

Regards.

Michel.

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cncb

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Re: asio wma 5.1
« Reply #2 on: June 25, 2007, 07:12:45 am »

You need a Pioneer receiver that can decode WMA 5.1 via spdif and it will work.  Otherwise, get something like the Auzentech cards with DTS connect that will convert the WMA 5.1 in realtime to DTS.
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mlefebvre

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Re: asio wma 5.1
« Reply #3 on: June 25, 2007, 07:19:52 am »

A side question... How does one create 5.1 WMA files? I have several nice concert DVDs that I ripped to lossless WMA but I can only get stereo WMA's, even if the DVD has both stereo and 5.1 sound.

What ripper is involved?

Thanks in advance.

Michel.
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liofr

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Re: asio wma 5.1
« Reply #4 on: June 25, 2007, 02:05:33 pm »

professionnal software tool  support 5.1 mix and export to wma 5.1 ( wma pro) :
cubase sx2
wave lab
flip4mac
cool edit pro
MS wma licence software
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mlefebvre

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Re: asio wma 5.1
« Reply #5 on: June 25, 2007, 02:58:56 pm »

Thanks Liofr,

Do you know of a DVD ripper that would allow me to extract the 5.1 soundtrack as a lossless 5.1 music files such as WMA 5.1?

Michel.
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mhakman

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Re: asio wma 5.1
« Reply #6 on: June 25, 2007, 05:43:01 pm »

According to information on the ‘Net, it is possible to use AC3Filter (open source) to encode 6 PCM streams into DD and output it via S/PDIF. Your need WMA 10 Pro audio codec (free to download) to get 6 PCM streams from WMA 5.1, I didn’t do it myself yet, but I’m using AC3Filter for other purposes, including S/PDIF via USB audio interface box, with good results.

Xbox 360 reads WMA 5.1 and outputs DD (and produces a lot of noise in the air).

Any path that converts WMA 5.1 to any non-lossless (DD, DTS) format will degrade the sound quality. For best results, you could use a 5.1 sound card (or an  USB/Firewire 5.1 audio interface) or a receiver decoding WMA 5.1 directly (provided the receiver has good WMA 5.1 decoder and good DAC. 

Do you know of a DVD ripper that would allow me to extract the 5.1 soundtrack as a lossless 5.1 music files such as WMA 5.1?
WMA 5.1 is not lossless. It actually squeezes 6 channels into the same bit rate as 2 lossless channels. Otherwise it wouldn’t be possible to output it via S/PDIF to e.g. Pioneer receiver. S/PDIF handles at most 2 raw PCM channels or compressed data with the same transport bit rate.

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cncb

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Re: asio wma 5.1
« Reply #7 on: June 25, 2007, 06:25:30 pm »

WMA 5.1 is not lossless. It actually squeezes 6 channels into the same bit rate as 2 lossless channels. Otherwise it wouldn’t be possible to output it via S/PDIF to e.g. Pioneer receiver. S/PDIF handles at most 2 raw PCM channels or compressed data with the same transport bit rate.

WMA 5.1 can be lossless.  You just won't be able to send it to the receiver via spdif.  You would need 6 analog outs for this as you recommended.
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mhakman

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Re: asio wma 5.1
« Reply #8 on: June 26, 2007, 10:51:45 am »

WMA 5.1 can be lossless.  You just won't be able to send it to the receiver via spdif.  You would need 6 analog outs for this as you recommended.
Yes, of course, I was referring to the fact that most of released material in WMA 5.1 isn’t lossless. Multi-channel audio interface (PCI, USB, Firewire etc) is required to get more than 2 lossless channels out of a computer. This is the same whether it’s multi-channel WMA, FLAC or even WAV. Analog multi-channel interfaces are readily available and quite affordable; they require an amplifier with corresponding number of input connectors, or active speakers. Digital multi-channel interfaces are scarce and more expensive. They often require an amplifier with 3 (5.1) or 4 (7.1) digital inputs, quite an expensive device. You could also use active digital loudspeakers connected directly to such digital multi-channel sound card. This should give the best quality. Another solution are multi-channel cards/devices outputting all channels via one optical fiber cable, the same kind of cable and connector as optical S/PDIF, called ADAT or LightPipe. The problem is that there are very few and expensive devices that know what to do with ADAT, as the format is proprietary and not disclosed.

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The Big Labinski

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Re: asio wma 5.1
« Reply #9 on: May 04, 2008, 05:26:25 am »

Dear all, I would propose ripping DVD audio stream in a AC3 file - not wma pro. Advantages: really lossless audio format, every digital receiver can play it.

My favorit software doing this: DVD Audio Extractor.

Wish a nice 2551
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mhakman

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Re: asio wma 5.1
« Reply #10 on: May 05, 2008, 10:16:35 am »

Dear all, I would propose ripping DVD audio stream in a AC3 file - not wma pro. Advantages: really lossless audio format, every digital receiver can play it.

My favorit software doing this: DVD Audio Extractor.

Wish a nice 2551
AC3 format stores audio in heavily compressed, lossy way.

DVD Audio Extractor extracts audio tracks from plain DVD Video discs. DVD Video discs can contain lossless stereo in PCM (WAV) format and/or multichannel (surround) audio in AC3 and/or DTS formats, both of which use lossy compression. In contrast, DVD Audio discs can contain multichannel audio in lossless compression format but DVD Audio Extractor cannot handle such disks. DVD Audio discs are readable in a plain computer DVD drives (as opposed to SACD discs) but they use much more advanced encryption than plain DVD Video discs do, and store the audio in proprietary, undisclosed, lossless format called MLP (Meridian Lossless Packing). Very few tools can handle this encryption and format.

The main problem with multichannel high quality digital audio is not how to store it in a computer (WMA, FLAC, WAV and more can be used) but how to get it out of the computer and audibly reproduced.

Plain S/PDIF line (coaxial or optical) can handle only 2 uncompressed channels. Technically it would be possible to transmit more channels than that using lossless compression such as FLAC. There are no receivers on the market that are able to handle such format.

Therefore, to transmit multichannel via S/PDIF to a receiver, a lossy compression such as AC3 (Dolby Digital) or DTS is used and handled by today’s receivers. What happens is that 6 or 8 audio channels are heavily compressed and then are packed into what appears to be 2 uncompressed channels. After transmission of these 2 encoded channels, the data is unpacked and decoded at the receiver into 6 or 8 channels of audio.

Another alternative is to use analog multichannel audio interface (card or box) and transmit audio using 6 or 8 analog lines (3 or 4 stereo) to your receiver. Any necessary decoding is then done in the computer or the card, not in the receiver. Such interfaces are readily available in consumer, prosumer, and professional (studio) quality and wide price range span. PCI (and related) and Firewire is the technology they use in order to connect to the computer.

Yet another alternative is to use an interface providing 6 or 8 digital output channels, and connect this digital output to an audio system providing corresponding number of digital inputs. This kind of equipment is used in modern, digital studios for monitoring the results of multichannel work (mixing, recording, and broadcasting). 

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