Re: dolby digital output

[Takashi Iwai <tiwai@suse.de>]

At Sun, 17 Feb 2002 18:47:35 +0100,
Markus Plail wrote:
> 
> Hi there!
> 
> On Sun, 17 Feb 2002 18:15:55 +0100 Andy Lo-A-Foe wrote:
> 
> > On Sun, Feb 17, 2002 at 01:33:32AM -0500, Hod McWuff wrote:
> > 
> > > I'd imagine the first step would be to add an ac3 encoder, and then
> > > (possibly) the 2->5.1 channel demuxing for stereo streams. This would
> > > result in the ability to mix dolby digital streams (DVD's) with more
> > > mundane PCM streams, such as IM or telephony apps.
> > 
> > None of the available open source software AC3 encoders are fast enough
> > to do realtime 5.1 encoding I think. The main task would be to try and
> > optimize this. Outputting compressed AC3 frames through alsa is probably
> > the easiest part (see http://www.alsaplayer.org for ac3play)
> 
> Are there really any AC3 ENcoders? I thought only quite expensive
> (windows) software would be able to do that, because of Dolby's licensing.
> If there are any what would those be?

ffmpeg can encode ac3, too.
i once made a patch to allow 5.1 encoding.  it seemed working, at
least for tests.
not sure how they handle this license problem, though..


Takashi

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