[mythtv-users] FYI - New HW video accellAPI from NVIDIA

Steven Adeff adeffs.mythtv at gmail.com
Wed Nov 19 18:18:56 UTC 2008

On Wed, Nov 19, 2008 at 11:58 AM, Brad DerManouelian
<myth at dermanouelian.com> wrote:
> On Nov 19, 2008, at 6:03 AM, Steven Adeff wrote:
>> On Wed, Nov 19, 2008 at 12:05 AM,  <lindsay.mathieson at gmail.com>
>> wrote:
>>>> or plug all those HDMI connections into a receiver and get
>>>> uncompressed high quality audio...
>>> Not sure what you mean by that Steve but it sounds interesting
>> The bandwidth in HDMI was set to allow uncompressed multichannel audio
>> up to (and possibly exceeding) 7.1 at a very high bitrate which allows
>> for very high quality audio (think better than DVD-Audio/SACD). It has
>> been taken use of with Blu-Ray(and what was HD-DVD) and is slowly
>> becoming the replacement for the old DVD-Audio/SACD debacle for music.
>> It may not be better(or worse?) than the DisplayPort thing, but it is
>> a standard that is in place and being used quite extensively.
> DisplayPort standard allows for more bandwidth (10.8Gbps) so
> theoretically better. HDMI 1.3 offers 10.2 Gbps which is more than
> earlier versions, but I don't know what they offered. DisplayPort also
> allows for great color depths and refresh rates than HDMI. Apple and
> Dell (and probably others) have started using DisplayPort as their
> preferred and standard port. I hope more people use it. Lots more info
> here: http://displayport.org
> None of this has anything to do with the new nVidia API. ;)

well yes, DisplayPort is designed as a digital monitor cable, HDMI was
designed for use in hometheaters, specifically tailored to HDTV

from the wikipedia,
"HDMI supports 8 channel uncompressed digital audio at 192 kHz sample
rate with 24 bits/sample as well as compressed audio streams such as
Dolby Digital and DTS.[14] HDMI supports up to 8 channels of one-bit
DSD audio, which is used on Super Audio CDs, at rates up to 4x that of
Super Audio CD.[14] With version 1.3, HDMI also supports lossless
compressed audio streams such as Dolby TrueHD and DTS-HD Master

so 8 channels at that high quality, or DTS-HD/Dolby-TrueHD which is
lossless compressed, so even better possible quality. Thats way more
than most people need/can take advantage of. Of course, fewer channels
allows for high sample/bit rates per channel.

Right, right. NVidia needs to get their driver doing audio over HDMI
working in linux. ;-)

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