[mythtv] [mythtv-commits] Ticket #1104: multi channelaudiosupport
Stanley Merkx
mythtv at merkx.demon.nl
Mon Oct 15 21:28:22 UTC 2007
Hmmm, weird...
I was interested in your post as I have at least one channel that has no
sound at the moment and several others that might have more channels than
I currently see, but the query "SELECT * FROM settings WHERE value =
'MaxChannels';" produced no results at all...
Does anybody know which revision should have introduced this value?
I am currently running SVN version 14621 and do not recall seeing any
problems when starting up for the first time on this revision...
Regards,
Stanley.
> An extra thought is that, since I changed the setting so MaxChannels=6, I
> no
> longer see 'Setting maxchannels to <x>, -1' in the logs. The last time I
> saw
> that was:
>
> 2007-10-08 00:50:31.009 AFD: Setting maxchannels to 2, -1
>
> So I wonder what's happened there.
>
> PC
>
> ---
> Paul Catchpole CCNA
> Cisco Enterprise Network Consultant
> www.paulcatchpole.co.uk
> 0121 285 5555
>
>
> -----Original Message-----
> From: mythtv-dev-bounces at mythtv.org [mailto:mythtv-dev-bounces at mythtv.org]
> On Behalf Of Paul Catchpole
> Sent: 15 October 2007 10:31
> To: 'Development of mythtv'
> Cc: Catchpole, Paul
> Subject: Re: [mythtv] [mythtv-commits] Ticket #1104: multi
> channelaudiosupport
>
> Hi Mark,
>
> I feel a right nonce for not spotting that setting. I've changed
> MaxChannels
> in the setup screen to '6' rather than 'Stereo'. Confirming this from the
> database now: [anteclounge is this frontend].
>
> mysql> SELECT * FROM settings WHERE value = 'MaxChannels';
> +-------------+------+-------------+
> | value | data | hostname |
> +-------------+------+-------------+
> | MaxChannels | 6 | anteclounge |
> | MaxChannels | 2 | kitchen100 |
> +-------------+------+-------------+
> 2 rows in set (0.02 sec)
>
> As it happens, I've just added a DVB-S card, so I now get a few more
> 6-channel streams and also quite a few that Myth identifies as Mono
> [assumedly correctly?]...
>
> The last example below, of the mono stream, is interesting... It appears
> that the evaluation in the code is if Channels=2 then use primary_device,
> if
> <anything else> use surround_Device. So for Channels=1, it selects the
> Surround51m device, for which I can't currently control volume! Perhaps
> this
> should be <=2 for the 2-channel? Then again, this might not actually be
> mono...
>
> Anyhoo, it looks like the mono case is the only one where I actually see
> anything other than the primary device being selected.
>
> 2-channel from DVB-T:
>
> 2007-10-15 09:47:17.917 AFD: Selected track 1: English MP2 2ch (A/V Stream
> #1)
> 2007-10-15 09:47:17.917 AFD: Initializing audio parms from audio track #1
> 2007-10-15 09:47:17.917 AFD: Audio format changed
> from id(NONE) -1Hz -1ch 0bps ; id(NONE)
> -1Hz -1ch 0bps
> to id( MP3) 48000Hz 2ch 16bps ; id( MP3)
> 48000Hz 2ch 16bps
> 2007-10-15 09:47:17.926 AO: Killing AudioOutputDSP
> 2007-10-15 09:47:17.927 Opening audio device 'softvol|surround51m'. ch 2
> sr
> 48000
> 2007-10-15 09:47:17.927 Inside ALSA:OpenDevice
> QString::arg(): Argument missing: Audio channels is two, so should open
> primary upmixer! Audio channels=, 2
> 2007-10-15 09:47:17.927 Audio channels is two, so should open primary
> upmixer! Audio channels=
> 2007-10-15 09:47:17.927 Opening ALSA audio device 'softvol'.
> 2007-10-15 09:47:17.940 NVP: Prebuffer wait timed out 10 times.
> 2007-10-15 09:47:18.070 in SetParameters(format=2, channels=2, rate=48000,
> buffer_time=100000, period_time=25000)
>
> Six Channel DVD, Internal Player:
>
> 2007-10-14 11:22:10.708 AFD: Audio Track #1 is A/V stream #1 and has 0
> channels in the Unknown language(0).
> 2007-10-14 11:22:10.726 AFD: Selected track 1: English AC3 5.1ch (A/V
> Stream
> #1)
> 2007-10-14 11:22:10.726 AFD: Initializing audio parms from audio track #1
> 2007-10-14 11:22:10.726 AFD: Audio format changed
> from id(NONE) -1Hz -1ch 0bps ; id(NONE)
> -1Hz -1ch 0bps
> to id( AC3) 48000Hz 6ch 16bps ; id( AC3)
> 48000Hz 2ch 16bps
> 2007-10-14 11:22:10.733 AO: Killing AudioOutputDSP
> 2007-10-14 11:22:10.733 Opening audio device 'softvol|surround51m'. ch 2
> sr
> 48000
> 2007-10-14 11:22:10.733 Inside ALSA:OpenDevice
> QString::arg(): Argument missing: Audio channels is two, so should open
> primary upmixer! Audio channels=, 2
> 2007-10-14 11:22:10.733 Audio channels is two, so should open primary
> upmixer! Audio channels=
> 2007-10-14 11:22:10.733 Opening ALSA audio device 'softvol'.
> 2007-10-14 11:22:11.025 in SetParameters(format=2, channels=2, rate=48000,
> buffer_time=100000, period_time=25000)
>
> DVB-S [BBC HD], 6-channel:
>
> 2007-10-14 19:25:14.163 AFD: Selected track 2: English AC3 5.1ch (A/V
> Stream
> #3)
> 2007-10-14 19:25:14.164 AFD: Initializing audio parms from audio track #2
> 2007-10-14 19:25:14.164 AFD: Audio format changed
> from id(NONE) -1Hz -1ch 0bps ; id(NONE)
> -1Hz -1ch 0bps
> to id( AC3) 48000Hz 6ch 16bps ; id( AC3)
> 48000Hz 2ch 16bps
> 2007-10-14 19:25:14.172 AO: Killing AudioOutputDSP
> 2007-10-14 19:25:14.172 Opening audio device 'softvol|surround51m'. ch 2
> sr
> 48000
> 2007-10-14 19:25:14.173 Inside ALSA:OpenDevice
> QString::arg(): Argument missing: Audio channels is two, so should open
> primary upmixer! Audio channels=, 2
> 2007-10-14 19:25:14.173 Audio channels is two, so should open primary
> upmixer! Audio channels=
> 2007-10-14 19:25:14.173 Opening ALSA audio device 'softvol'.
> 2007-10-14 19:25:14.191 in SetParameters(format=2, channels=2, rate=48000,
> buffer_time=100000, period_time=25000)
>
> DVB-S Mono [?]:
>
> 2007-10-14 19:30:19.480 AFD: Opened codec 0xaa486b0, id(MPEG2VIDEO)
> type(Video)
> 2007-10-14 19:30:19.488 AFD: Selected track 1: Unknown MP2 1ch (A/V Stream
> #0)
> 2007-10-14 19:30:19.489 AFD: Initializing audio parms from audio track #1
> 2007-10-14 19:30:19.489 AFD: Audio format changed
> from id(NONE) -1Hz -1ch 0bps ; id(NONE)
> -1Hz -1ch 0bps
> to id( MP3) 44100Hz 1ch 16bps ; id( MP3)
> 44100Hz 1ch 16bps
> 2007-10-14 19:30:19.498 AO: Killing AudioOutputDSP
> 2007-10-14 19:30:19.498 Opening audio device 'softvol|surround51m'. ch 1
> sr
> 44100
> 2007-10-14 19:30:19.498 Inside ALSA:OpenDevice
> QString::arg(): Argument missing: Audio channels isn't two, so should open
> multichannel device next! Audio channels=, 1
> 2007-10-14 19:30:19.498 Audio channels isn't two, so should open
> multichannel device next! Audio channels=
> 2007-10-14 19:30:19.498 Opening ALSA audio device 'surround51m'.
> 2007-10-14 19:30:19.518 in SetParameters(format=2, channels=1, rate=44100,
> buffer_time=100000, period_time=25000)
>
>
>
> ---
> Paul Catchpole CCNA
> Cisco Enterprise Network Consultant
> www.paulcatchpole.co.uk
> 0121 285 5555
>
>
> -----Original Message-----
> From: mythtv-dev-bounces at mythtv.org [mailto:mythtv-dev-bounces at mythtv.org]
> On Behalf Of Mark Spieth
> Sent: 12 October 2007 00:02
> To: mythtv-dev at mythtv.org
> Subject: Re: [mythtv] [mythtv-commits] Ticket #1104: multi channel
> audiosupport
>
>>
>> In the mean time I've tried setting the database field to the
>> "ALSA:softvol|surround51m" value and although my upmixed audio works as
>> usual, trying a DVD with the internal player appears to use 'softvol'
>> rather than the 5.1 PCM...
>>
>> That's what it 'sounds' like in any case, and I'm guessing that the
>> 'channels=2' in the setparameters line at the bottom of the following
>> log
>> confirms that?
>>
>> 2007-10-07 23:25:01.247 AFD: Warning, video codec 0x877fdb0
>> id(MPEG2VIDEO)
>> type (Video) already open.
>> 2007-10-07 23:25:01.708 AFD: Setting maxchannels to 2, -1
>
> this is probably your problem. you havent selected 6 ch mode in setup I
> suspect. If you dont select that, you wont get 6ch output.
> Then if the audio stream is 6 channel it will use the 2nd of the devices,
> otherwise it will use the first device.
> If maxchannels is 2 as in your case then it will downmix the 6ch to 2 ch
> in
> the ac3 or dts decoder and present only 2ch audio to the audiooutput
> subsystem.
>
> mark
>
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