[mythtv-users] ALSA:plug:surround51 works, but only two channels used?
keller.g at gmail.com
Tue Jan 8 05:11:34 UTC 2008
Hello! I've always appreciated help from you guys in the past, and know
I can expect the same this time. Thanks in advance.
I'm trying to setup analog surround sound from my frontend, out my
SBLive, to my receiver. I know that 6ch analog out works, since I can
watch a DVD in VLC with 5.1 selected and all is correct.
I'm seeing strange behavior by Myth. Please see the following from
'mythfrontend -v audio' run on SVN revision 15283.
./configure --prefix=/usr --enable-proc-opt --disable-firewire
--disable-audio-arts --disable-audio-jack --enable-opengl-vsync
--disable-xvmc --enable-opengl-video --disable-dvb --disable-dbox2
--disable-hdhomerun --disable-iptv --disable-v4l --disable-ivtv
2008-01-07 22:52:21.279 AFD: Opened codec 0x841c3a0, id(MPEG2VIDEO)
2008-01-07 22:52:21.280 AFD: Opened codec 0x841c720, id(AC3) type(Audio)
2008-01-07 22:52:21.280 AFD: Audio Track #1 is A/V stream #1 and has
6 channels in the English language(6647399).
2008-01-07 22:52:21.287 AFD: Selected track 1: English AC3 5.1ch
(A/V Stream #1)
2008-01-07 22:52:21.287 AFD: Initializing audio parms from audio
2008-01-07 22:52:21.287 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
2008-01-07 22:52:21.291 AO: Killing AudioOutputDSP
2008-01-07 22:52:21.292 Opening ALSA audio device 'plug:surround51'.
2008-01-07 22:52:21.293 in SetParameters(format=2, channels=2,
rate=48000, buffer_time=500000, period_time=125000)
2008-01-07 22:52:21.295 get_buffer_size returned 16384
2008-01-07 22:52:21.295 set_period_time_near returned 170666
2008-01-07 22:52:21.295 get_period_size returned 8192
Myth can see the audio streams, sees that Audio Track 1 has 6 channels,
selects the English AC3 5.1 track, and changes the format to 6ch. It
then opens the (working) alsa:plug:surround51 device. Then, for some
reason, it sets the ALSA parameters to only two channels. It seems like
all the prereqs for 6ch surround have been satisfied, but 2 channels is
all I get.
If I take the raw MPEG file and open it in VLC, I can select 5.1
surround and it works correctly. Any ideas anyone has would be GREATLY
appreciated! Thanks in advance once again!
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