[mythtv-users] Digital Audio Passthrough not working Mythtv 0.24-fixes

[Jean-Yves Avenard]

Hi

On 10 November 2010 06:33, David Knight <dlknight at sdf.lonestar.org> wrote:
> I've just upgraded to Mythtv 0.24-fixes and I'm glad the build process was
> as simple as for 0.23.1 :) Just a few modifications required to the
> build_myth.sh.
>
> Now in Mythtv 0.23.1 I had the following options configured which
> outputted audio to the analog output of my soundcard and also the optical
> audio out into my DD/DTS amplifier. This worked great and I could listen
> to all sources via my amplifier with DD/DTS being output when the source
> supported it.
>
> Audio output device = "ALSA:default"
> Passthrough output device: "ALSA:iec958 {AES0: 0x02}"
> Max Audio Channels: 5.1
> Upmix: Passive
> Enable AC3 to SPDIF passthrough = Enabled
> Enable DTS to SPDIF passthrough = Enabled
> Advanced Audio Configuration = Disabled
> Use internal volume controls = Enabled
>
> In Mythtv 0.24 the same settings do not work with DD/DTS, instead I get no
> sound and stuttery video which utimately stops playing after 5-10 seconds
> with a buffer error.
>
> If I change the audio output device in Mythtv 0.24 to "ALSA:iec958 {AES0:
> 0x02}" then playback through the spdif interface works fine although I no
> longer having the ability to output analog audio from the soundcard or
> control the volume of stereo PCM audio with the internal volume controls.
> Does anyone have any ideas why this isn't working?

Press the scan device button ; select ALSA:default in the list

Check the Advanced Audio Configuration ; check override passthrough
device and enter "ALSA:iec958 {AES0: 0x02}"

It should work the same way as 0.23

BTW, don't use Upmix passive, this option was removed, it produces awful result