[mythtv-users] Bluray DTS passthrough doesn't work

[Jean-Yves Avenard]

On 17 March 2014 15:35, Paul B. Henson <henson at acm.org> wrote:
> I'm setting up a new 0.27 myth system, and was testing DVD and Bluray
> rips in mkv containers. My system has a receiver hooked up via HDMI that
> supports pretty much all the codecs, and I'm configuring mythtv for
> passthrough.
>
> When I play a DVD rip with the internal player, the receiver show Dolby
> Digital, and it works great.
>
> When I try to play a Bluray rip, there's no sound at all and the
> receiver is just blinking like it's waiting for sound or trying to
> figure out what it's seeing.
>
> If I play the same Bluray rip with mplayer (mplayer -ao
> alsa:device=hw=1.9 -afm hwac3), it works fine, and the receiver shows
> DTS, so the hardware is definitely capable.
>
> I have mythfrontend configured to use ALSA:default, which is labeled as
> "TX-NR609 connected to HDMI", and shows support for "up to 7.1 (LPCM,
> AC3, DTS, DSD, E-AC3, DTS-HD, TrueHD)", and I have all the passthrough
> checkboxes clicked. If I flip through the other options, there's one
> specific to the HDMI device which shows the same details as the default,
> as that's what the default points to.

'default' is *very* unlikely going to be the device you want to use.

If connected via hdmi, it will be a device that contains the word hdmi

You wrote that alsa:device=hw=1.9 works with mplayer; you could always
use that one


> Any ideas why AC3 passthrough works, but not DTS?

You wrote:

> If I play the same Bluray rip with mplayer (mplayer -ao
> alsa:device=hw=1.9 -afm hwac3), it works fine, and the receiver shows
> DTS, so the hardware is definitely capable.

you use the hwac3 codec and you're getting high-Def audio ? I
seriously doubt it.

You would have had to use hwdts

AC3 and DTS-HD do not use the same digital signal...

JY