[mythtv-users] alsa 1.0.24, 0.24.2-fixes, ubuntu lucid, hdmi audio, AC3/DTS not working

[Pieter De Wit]

Hi,

So I sneaked in an Upgrade to "Ubuntu 12.04" (Thanks to the cats that woke 
me up at 02:30...awesome). There hasn't been a hard reset of the PC since, 
but the output has hardly changed (if any) :

# cat /proc/asound/card0/eld#1.0
monitor_present		1
eld_valid		1
monitor_name		SAMSUNG

connection_type		HDMI
eld_version		[0x2] CEA-861D or below
edid_version		[0x3] CEA-861-B, C or D
manufacture_id		0x2d4c
product_id		0x4fb
port_id			0x20000
support_hdcp		0
support_ai		0
audio_sync_delay	0
speakers		[0x4f] FL/FR LFE FC RL/RR RLC/RRC
sad_count		4
sad0_coding_type	[0x1] LPCM
sad0_channels		2
sad0_rates		[0x6e0] 32000 44100 48000 96000 176400
sad0_bits		[0xe0000] 16 20 24
sad1_coding_type	[0x1] LPCM
sad1_channels		8
sad1_rates		[0x6e0] 32000 44100 48000 96000 176400
sad1_bits		[0xe0000] 16 20 24
sad2_coding_type	[0x2] AC-3
sad2_channels		6
sad2_rates		[0xe0] 32000 44100 48000
sad2_max_bitrate	640000
sad3_coding_type	[0x7] DTS
sad3_channels		6
sad3_rates		[0xe0] 32000 44100 48000
sad3_max_bitrate	1536000

I can get all the options on "Card 8", but then I get no sound. I am 
wondering however if it has to do with the fact that I am using a TV card 
and not video. What I mean is that the sound might work if I play a video, 
not Live TV.

I will investigate a bit more tonight. The current packages stand at:

ii  alsa-base                              1.0.25+dfsg-0ubuntu1 
ALSA driver configuration files
ii  alsa-utils                             1.0.25-1ubuntu1 
Utilities for configuring and using ALSA
ii  linux-image-3.2.0-17-generic           3.2.0-17.26 
Linux kernel image for version 3.2.0 on 64 bit x86 SMP
ii  mythtv-backend 
2:0.25.0~master.20120216.769dfae-0ubuntu1    A personal video recorder 
application (server)
ii  mythtv-backend-master 
2:0.25.0~master.20120216.769dfae-0ubuntu1    Metapackage to setup and 
configure a "Master Backend" profile of MythTV.
ii  mythtv-common 
2:0.25.0~master.20120216.769dfae-0ubuntu1    A personal video recorder 
application (common data)
ii  mythtv-database 
2:0.25.0~master.20120216.769dfae-0ubuntu1    A personal video recorder 
application (database)
ii  mythtv-frontend 
2:0.25.0~master.20120216.769dfae-0ubuntu1    A personal video recorder 
application (client)

Cheers,

Pieter


  On Tue, 21 Feb 2012, Jean-Yves Avenard wrote:

> Hi
>
> On 21 February 2012 17:21, Pieter De Wit <pieter at insync.za.net> wrote:
>
>> sad0_coding_type        [0x1] LPCM
>> sad0_channels           2
>> sad0_rates              [0x6e0] 44100 48000 88200 176400 192000
>> sad0_bits               [0xe0000] 16 20 24
>> sad1_coding_type        [0x1] LPCM
>> sad1_channels           8
>
> interesting that they have put two LPCM sad in there..
>
>> My question is, with 0.25 and a later kernel, will I get TrueHD audio or
>> DTS-HD, or any of the other modes listed on the Website ?
>
> Yes.
> refer to http://www.mythtv.org/wiki/User_Manual:HDAudioPassthrough
>
> you do not need a kernel upgrade , just an alsa upgrade (1.0.24 for HD
> audio passthrough)
>
> For being able to get myth to properly read the capabilities of your
> device, you need ALSA 1.0.25 (Warning , get it from git, do not use
> the 1.0.25 archive on alsa web site; it's broken for nvidia audio)
>
> It would be of some help if you actually upgraded now to Myth 0.25 and
> provide some testing feedback
>
> JY
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>