[mythtv-users] Capturing 5.1 audio

[Steve Adeff]

On Tuesday 15 November 2005 03:09, Bob wrote:
> Steve Adeff wrote:
> > On Saturday 12 November 2005 23:41, Michael T. Dean wrote:
> >>On 11/12/05 19:55, Nathan Allen Stratton wrote:
> >>>On Sat, 12 Nov 2005, Michael T. Dean wrote:
> >>>>Nope.  ATSC (US high-definition TV) is broadcast already encoded using
> >>>>the MPEG-2 system.  The audio is encoded in an AC-3 stream within the
> >>>>transport stream.  So, it's just there.
> >>>
> >>>Hmm so since I setup the mp3 audio encoding on the video profiles I
> >>> would trash the AC-3 stream off my hdtv card. Yet, if I dont compress
> >>> audio my hdtv card audio will be AC-3, but I will suck up huge space
> >>> with the 44K audio off my 2 plextor boxes.
> >>
> >>AIUI, those parameters (and bitrate, etc.) of the profile are not used
> >>for HDTV capture cards since the stream is just dumped to disk.  So, you
> >>can set the audio encoding to whatever you'd like.
> >
> > how much CPU would it take to capture and encode video from a non-PVR
> > capture card so that it can be muxed with the audio from a soundcard? I
> > ask because I happen to have an older WinTV card laying around. I'd even
> > be willing to accept a lossless capture format to allow for easy live TV
> > with AC3, with the ability to convert to XviD later if I decided to keep
> > the recording.
> >
> > Steve
>
> About a spoon full.
>
> But seriously, lossless compression tends to be more cpu intensive than
> lossy, particularly if your aiming for respectable compression ratios,
> if your not even SD content is going to take up a *lot* of space very fast.
>
> As for how much CPU to capture from a frame grabber look at
> http://www.mythtv.org/docs/mythtv-HOWTO-3.html#ss3.1

So now I just have to see i its possible to capture a 5.1 stream? If so then 
its just a matter of getting MythTV to use a BTTV device for video input and 
the 5.1 input for audio right?

Steve