[mythtv] [mythtv-commits] Ticket #1104: multi channel audio support

Daniel Kristjansson danielk at cuymedia.net
Wed Feb 6 15:47:38 UTC 2008

On Wed, 2008-02-06 at 22:59 +1100, Mark Spieth wrote:
> > Mark, passthru works with 48, but I'm just getting a lot of noise on re-
> > encode... are you sending the right AC3 marker bits in the re-encoded
> >  stream?
> woops forgot that I have a half complete ffmpeg fft implementation.
> use
> configure --enable-libfftw3
> to use fftw3 as its not the default in 48.
> but that wont influence reencode/passthru as upmixing os off for this mode.

Yep, rencode is still not working with --enable-libfftw3

> >
> >  BTW The for the mix problem in analog, just play any old PVR-250
> >  recording. If you've adjusted your system correctly for 5.1, it sounds as
> >  if these 2ch recordings are being mixed to 5.1 so that they voices are
> >  very low volume while the background sounds are still at the correct
> >  volume; overall the volume is lower than 5.1 ATSC sources. I also see 
> > this
> >  on ads in Sunday's Superbowl, at minute 50:30 the Pepsi ad is ok, at 
> > 51:00
> >  the salesgenie ad has very low volume, and the Fox terminator promo at
> >  51:30 mostly sounds ok but sound noticeably dips in a few of the cuts.
> Im experimenting with gains some more whilst watching.
> Im doubling the center_level as a test.

Concentrate on getting reencode and ffmpeg FFT working if you can.
I'm happy to apply the patch if all that's left is some tweaking of
volume knobs, that is better done with many test systems anyway.

-- Daniel

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