[mythtv-users] HDMI audio only 2.0

Justin Smith justin at smithpolglase.com
Tue May 31 15:34:35 UTC 2022


Hi,

I've just put together a new mythtv box which uses an Intel i5-12400
running on an Asus B660M motherboard. It's running Ubuntu 22.04
desktop minimal and mythtv 32 fixes from the standard ppa. I'm using the
built-in HDMI connected to a Marantz 5.1 receiver with the receiver HDMI
out connected to the TV.

My problem is that I cannot configure 5.1 audio. No matter what audio
output device I set, the "Digital Audio Capabilities" menu remains greyed
out, and the speaker configuration fixed at Stereo.

I get audio out of the receiver, but only 2 channels.

I've run mythfrontend -v audio and there are a gazillion audio devices but
*all* are 2.0. Of these, 3 audio devices seem to suggest that they
understand multi-channel digital audio. These are reported as (after an
audio device scan):

2022-05-31 22:40:32.806995 I  Found ALSA:plughw:CARD=PCH,DEV=3 (HDA Intel
PCH, HDMI 0
Hardware device with all software conversions (marantz-AVR connected to
HDMI)
Device supports up to 2.0 (LPCM, AC3, DTS, E-AC3, DTS-HD, TrueHD))

2022-05-31 22:40:32.515369 I  Found ALSA:hw:CARD=PCH,DEV=3 (HDA Intel PCH,
HDMI 0
Direct hardware device without any conversions (marantz-AVR connected to
HDMI)
Device supports up to 2.0 (LPCM, AC3, DTS, E-AC3, DTS-HD, TrueHD))

2022-05-31 22:40:32.104090 I  Found ALSA:hdmi:CARD=PCH,DEV=0 (HDA Intel
PCH, HDMI 0
HDMI Audio Output (marantz-AVR connected to HDMI)
Device supports up to 2.0 (LPCM, AC3, DTS, E-AC3, DTS-HD, TrueHD))

I've tried all three (plus many others) without success. For reference, the
logs prior to each are identical:
2022-05-31 22:40:32.089221 I  AOS: Sample rate 32000 is supported
2022-05-31 22:40:32.089225 I  AOS: Sample rate 44100 is supported
2022-05-31 22:40:32.089228 I  AOS: Sample rate 48000 is supported
2022-05-31 22:40:32.089231 I  AOS: Sample rate 88200 is supported
2022-05-31 22:40:32.089233 I  AOS: Sample rate 96000 is supported
2022-05-31 22:40:32.089236 I  AOS: Sample rate 176400 is supported
2022-05-31 22:40:32.089239 I  AOS: Sample rate 192000 is supported
2022-05-31 22:40:32.089241 I  AOS: Format signed 16 bit is supported
2022-05-31 22:40:32.089243 I  AOS: Format signed 32 bit is supported
2022-05-31 22:40:32.089249 I  AOS: 2 channel(s) are supported
2022-05-31 22:40:32.089255 I  AOS: 4 channel(s) are supported
2022-05-31 22:40:32.089259 I  AOS: 6 channel(s) are supported
2022-05-31 22:40:32.089264 I  AOS: 8 channel(s) are supported
2022-05-31 22:40:32.089406 I  ALSA: Successfully retrieved ELD data
2022-05-31 22:40:32.089412 I  ELDUTILS: Detected monitor marantz-AVR at
connection type HDMI
2022-05-31 22:40:32.089416 I  ELDUTILS: available speakers: FL/FR LFE FC
RL/RR RC RLC/RRC
2022-05-31 22:40:32.089418 I  ELDUTILS: max LPCM channels = 8
2022-05-31 22:40:32.089419 I  ELDUTILS: max channels = 8
2022-05-31 22:40:32.089422 I  ELDUTILS: supported codecs = LPCM, AC3, DTS,
E-AC3, DTS-HD, TrueHD
2022-05-31 22:40:32.089430 I  ELDUTILS: supports coding type LPCM: channels
= 8, rates = 32000 44100 48000 96000 176400 192000, bits = 16 20 24
2022-05-31 22:40:32.089433 I  ELDUTILS: supports coding type AC3: channels
= 6, rates = 32000 44100 48000, max bitrate = 640000
2022-05-31 22:40:32.089436 I  ELDUTILS: supports coding type DTS: channels
= 6, rates = 44100 48000 96000 176400, max bitrate = 1536000
2022-05-31 22:40:32.089438 I  ELDUTILS: supports coding type E-AC3:
channels = 8, rates = 44100 48000
2022-05-31 22:40:32.089441 I  ELDUTILS: supports coding type DTS-HD:
channels = 8, rates = 44100 48000 96000 176400 192000
2022-05-31 22:40:32.089443 I  ELDUTILS: supports coding type TrueHD:
channels = 8, rates = 44100 48000 96000 176400 192000
2022-05-31 22:40:32.104076 I  AOBase: Killing AudioOutputDSP
2022-05-31 22:40:32.104078 I  AOBase: m_outputSettings !=
m_outputSettingsDigital : 0
2022-05-31 22:40:32.104079 I  AOBase: m_outputSettingsRaw !=
m_outputSettings 0

...which seems OK to me.

I installed VLC on the same box and played some sample videos with various
multi-channel digital audio formats. All played audio out of all 5.1
speakers correctly and VLC reported as much.

Note also that I already have another mythtv box (2015 vintage) running 32
fixes on Ubuntu desktop 20.04 which plays multi-channel digital through the
same receiver (and TV) fine. This box has an nVidia GT610 graphics card
with HDMI out.

Does anyone have any idea of what may be wrong with my setup?


Thanks,
Justin.
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