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[linux-dvb] Re: Questions about dvdplayer
Andreas Wohlfeld writes:
> On Tue, Jan 16, 2001 at 10:07:46PM +0100, Ralph Metzler wrote:
> > > > But can you get the AC3 stream (e.g. from Pro7) out of the spdif connector?
> > > > I haven't yet connected my dvb-s to my dd receiver so I have no
> > > > experience with that.
> > >
> > > As stated by Ralph Metzler this is not possible due to some hardware
> > > related limitations. I guess the data forwarder isn't able to handle ac3
> > > streams. Ralph: is that true?
> >
> > Yes, that's correct.
> > To handle AC3 one would have to have control over the complete output
> > stream to create the appropriate headers.
> > But on the current hardware you cannot do that. You can only send PCM
> > data.
>
> So the DVB-S can't do it, but can you get the AC3 stream and send it to
> a soundcard? Alsa can output AC3 streams with Trident and other cards.
Yes, you can do that.
You can see in the API description how to set up a PES filter.
For the old API I posted an example how to do this some time ago.
At that time I tried piping it through ac3dec but the decoded sound
was lagging behind the picture quite a bit.
But if you pipe it through the AC3 output of the sound card and decode
it in hardware it could be fine.
Ralph
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