Re: DVB Audio connectivity [was:] DVB Playback Issues

Hi Bill,

Here is the computer we're using: http://partner.aopen.com/source/news/de70=
00_20100329-aoe.htm

I checked it out and I believe if there are any connections between the vid=
eo card and sound, it would be on the board somewhere. Sound works fine whe=
n we launch alsa's speaker-test command (speaker-test -c 2).
The only cable we're plugging into the monitor and TV is an HDMI cable. We'=
re running kernel 2.6.38.4=85 not sure if there are any issues with that or=
 not.

Thanks,
Derek
 =

On Dec 27, 2011, at 1:18 PM, Bill Pringlemeir wrote:

> [sorry about gmail's stupid formatting issues]
> =

> On 20 Dec 2011, [email protected] wrote:
> =

>> I'm actually not sure if my screens accept AC3 input. I tried two
>> different screens=85 an Elo 4200L
>> (http://www.elotouch.com/products/ids/4200L/default.asp) and a Dynex
>> DX-24E150A11. I did not find any mention of AC3 for either of them and
>> the audio settings don't reveal any useful information.
> =

> There are a couple of ways you can connect audio.  It sounds like you
> want to use the speakers attach to your monitor.
> =

> PC   video card    <-- HDMI -->               Monitor
>      audio card    <-- TRS -->
> =

> The 2nd way needs an audio card hooked to the video card,
> =

> PC   video card    <-- HDMI -->               Monitor
>      ^
>      internal cable
>      v
>      audio card
> =

> http://en.wikipedia.org/wiki/TRS_connector
> http://en.wikipedia.org/wiki/Hdmi
> http://en.wikipedia.org/wiki/Spdif
> =

> Hdmi supports both audio and video in a single cable.  The previous
> generation of audio and video cabling was DVI and 'spdif'.  The 'spdif'
> connectors were either coax or fiber optic (probably multi-mode).
> Because of bandwidth considerations, the only way to send 5.1 sound over
> spdif was to encode the signal (like mp3).  This encoding is called AC3.
> The HDMI audio is suppose to support all of the SPDIF, plus more.
> However, I believe that your monitors may not support HDMI sound.  The
> ATSC (North American TV) uses an 'AC3' encoding.  So, spdif, AC3 and
> HDMI sound are sometimes used loosely to mean the same things.
> =

> You need to have alsa setup to play these different connectivities
> before mplayer can begin to use it.  So do you have the 'TRS' connector
> plugged in or are you just using an HDMI cable and getting sound?  How
> are games, error beeps, etc playing.  You may have 'speaker-test'
> installed with alsa-utils.  You can use this to see if a cable is needed
> or not.  Ie, you might have the both cables to the monitor, but actually
> only be using HDMI.
> =

> All this said, the stream you uploaded seems very messed up to me.  I
> would try something from 'dvb-apps' or something non-mplayer to grab a
> stream.  Also, from about 2.6.31-2.6.36, there was some re-organizing of
> the Linux DVB drivers.  It made the code more sensible, but there are
> lots of changed to the TV capture cards during these releases.
> =

> Hth,
> Bill Pringlemeir.
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