[mythtv-users] AC3 Decoding without external hardware?

Steven Adeff adeffs.mythtv at gmail.com
Thu Apr 6 17:34:52 UTC 2006


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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