[mythtv-users] AC3 Decoding without external hardware?

Jim Torelli jim.torelli at us.logicalis.com
Thu Apr 6 17:07:47 UTC 2006

Right on!

So, a quick, stupid question then :) Is there any way to get the current 
version of MythTV to somehow stream it's audio through a52dec/liba52, such 
piping it through a a named pipe or something, or would it take actual coding 
to integrate them?  


On Thursday 06 April 2006 11:34, Steven Adeff wrote:
> On 4/6/06, Jim Torelli <jim.torelli at us.logicalis.com> wrote:
> > Hi everyone!
> >
> > Hey, I just have a quick question about AC3 decoding.. Is there a
> > software AC3 decoder or any other way currently in MythTV to decode Dolby
> > Digital sound on-the-fly without using S/PDIF passthough to an external
> > receiver or using a dobly digital decoder built onto the sound card (not
> > sure if those work or not under linux).
> >
> > For example, if I turn on AC3 Passthrough in the MythTV settings menu and
> > record and HD program over firewire, if I try and watch it through MythTV
> > all I hear is clicks (the analog version of the digital audio stream). 
> > However, if I exit out of MythTV and play the NUV via MPlayer, I get full
> > 5.1 surround sound.. I'm assuming this is because MPlayer is using liba52
> > or something to software decode the audio stream..
> >
> > Is there any way to decode these AC3 streams via a software decoder
> > through MythTV like MPlayer does currently?  If not, does anyone know if
> > there is any work being done to support this?  Would is really be as
> > simple as just integrating something like lib52 into MythTV?
> it does, many people use it with the 5.1 analog output soundcards on
> their computer. It will also downmix to stereo output if thats all you
> got.
> --
> Steve
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