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

Mark Spieth mark at digivation.com.au
Wed Feb 6 11:59:12 UTC 2008

> 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.
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.

>  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.


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