Re: [LAU] What audio interface to use for a Linux-powered surround preamp?

Previous message: [thread] [date] [author]
Next message: [thread] [date] [author]
To: <jherland@...>
Cc: <linux-audio-user@...>
Date: Sunday, February 19, 2012 - 6:29 pm

--_a283be9a-3ec3-41a2-9729-af6b593158a0_
Content-Type: text/plain; charset="iso-8859-1"
Content-Transfer-Encoding: quoted-printable

Content Protection sucks!

Going via an analogue hole would be one way=2C but a pain in the arse. I wo=
uldn't expect any prosumer=2C and even less professional=2C to allow you to=
bypass encryption though. Software solutions may show up...

Seems there is one HD switch/multiplexer available which does though. http:=
//www.moomecard.com/index.php?option=3Dcom_content&view=3Darticle&id=3D10&I=
temid=3D16 Output the separate audio and video you want (although audio is =
on 2x TOSLink.)

But obviously there is the worry that a new version of HDCP will be release=
tomorrow so bypassing in this manner is never ideal!

Dale.

> Date: Sun=2C 19 Feb 2012 14:11:14 +0100

nd preamp?
gic if
pport
ld of
puter
=

--_a283be9a-3ec3-41a2-9729-af6b593158a0_
Content-Type: text/html; charset="iso-8859-1"
Content-Transfer-Encoding: quoted-printable

Content Protection sucks!Going via an analogue hole would be one wa=
y=2C but a pain in the arse. I wouldn't expect any prosumer=2C and even les=
s professional=2C to allow you to bypass encryption though. Software soluti=
ons may show up...Seems there is one HD switch/multiplexer availabl=
e which does though. http://www.moomecard.com/index.php?option=3Dcom_conten=
t&amp=3Bview=3Darticle&amp=3Bid=3D10&amp=3BItemid=3D16 Output the separate =
audio and video you want (although audio is on 2x TOSLink.)But obvi=
ously there is the worry that a new version of HDCP will be release tomorro=
w so bypassing in this manner is never ideal!Dale.&gt=3B Date: Sun=2C 19 Feb 2012 14:11:14 =
+0100&gt=3B Subject: Re: [LAU] What audio interface to use for a Linux-=
powered surround preamp?&gt=3B From: jherland@gmail.com&gt=3B To: d=
j_kaza@hotmail.com&gt=3B CC: gheskett@wdtv.com=3B linux-audio-user@list=
s.linuxaudio.org&gt=3B &gt=3B Thanks for your reply=3B some comment=
s below.&gt=3B &gt=3B 2012/2/19 Kaza Kore &lt=3Bdj_kaza@hotmail.com=
&gt=3B:&gt=3B &gt=3B As to video. There are some HDMI capture cards ava=
ilable=2C EG Black Magic if&gt=3B &gt=3B on a tight budget=2C but from =
a quick reading it seems they all only support&gt=3B &gt=3B the baselin=
e of 2 channel audio on HDMI=2C rather than the possible 8&gt=3B &gt=3B=
channels.&gt=3B &gt=3B [...]&gt=3B &gt=3B An added complic=
ation here=2C is that I want something that will work&gt=3B with HDCP (=
AFAICS=2C the prosumer video equipment you mention will not&gt=3B accep=
t HDCP signals). Also=2C I'm not really in the market for lots of&gt=3B=
video equipment. I simply want something that can switch between&gt=3B=
mutiple HDMI sources (including consumer equipment such as BluRay/DVD&=
gt=3B players)=2C and then split the chosen HDMI signal=2C so that video go=
es&gt=3B directly to the screen=2C and audio goes to my computer for fu=
rther&gt=3B processing.&gt=3B &gt=3B Hence=2C I'm not really in=
the market for prosumer/professional video&gt=3B equipment. I don't ac=
tually want the video signal into my computer at&gt=3B all. However=2C =
there is currently no (consumer-level) standard (except&gt=3B HDMI) for=
transferring multi-channel uncompressed digital audio&gt=3B between de=
vices. Ideally=2C I'd want a device with HDMI input and&gt=3B HDMI(vide=
o) output=2C along with outputs for transmitting 8ch LPCM&gt=3B (decode=
d from the HDMI audio signal). The audio output could be&gt=3B somethin=
g like 1 x ADAT=2C or even 4 x SPDIF (or AES/EBU) - I don't&gt=3B reall=
y care - as long as it could be straightforwardly connected to my&gt=3B=
computer.&gt=3B &gt=3B &gt=3B Or has the HDMI switch done away wit=
h the need for a lot of this? I would of&gt=3B &gt=3B used a basic swit=
ch=2C which are available cheaply=2C then into the computer&gt=3B &gt=
=3B using one of the above methods...&gt=3B &gt=3B For now=2C I am =
using a cheap HDMI switch with an audio de-multiplexer&gt=3B that redir=
ects the 2ch. bitstream to an SPDIF output. This is&gt=3B obviously not=
ideal=2C since it cannot handle &gt=3B2ch LPCM (including the&gt=3B Do=
lby TrueHD or DTS-HD Master Audio formats)=2C but it _is_ able to do&gt=
=3B the Dolby Digital and DTS formats that are compressed into the 2ch.=
&gt=3B stream. This is "good enough" for now=2C since most of my video mate=
rial&gt=3B is DVDs (although the BluRay collection is growing slowly)=
=2C and most&gt=3B of the high-quality audio is in computer files that =
I can play&gt=3B directly from the computer and thus does not have to t=
raverse the HDMI&gt=3B switch.&gt=3B &gt=3B Considering the dir=
ection technology is moving=2C I might have most&gt=3B video and audio =
accessible directly from the computer in the future=2C&gt=3B thus makin=
g the HDMI switch less important (only needed for things&gt=3B like con=
sole games=2C etc.)&gt=3B &gt=3B &gt=3B Have fun! :)&gt=3B =
&gt=3B ...Johan&gt=3B &gt=3B -- &gt=3B Johan Herland=2C &lt=
=3Bjherland@gmail.com&gt=3B&gt=3B www.herland.net =

=

--_a283be9a-3ec3-41a2-9729-af6b593158a0_--

Previous message: [thread] [date] [author]
Next message: [thread] [date] [author]

Messages in current thread:
Re: [LAU] What audio interface to use for a Linux-powered su..., Jörn Nettingsmeier, (Sun Dec 18, 11:30 am)
Re: [LAU] What audio interface to use for a Linux-powered su..., Jörn Nettingsmeier, (Mon Dec 19, 10:14 am)
Re: [LAU] , gene heskett, (Mon Dec 19, 11:19 pm)
Re: [LAU] What audio interface to use for a Linux-powered su..., Kaza Kore, (Sun Feb 19, 6:29 pm)
Re: [LAU] , gene heskett, (Tue Dec 20, 11:24 pm)
Re: [LAU] , gene heskett, (Wed Dec 21, 3:52 am)
Re: [LAU] , gene heskett, (Wed Dec 21, 3:24 pm)