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Hello! I've always appreciated help from you guys in the past, and
know I can expect the same this time. Thanks in advance.<br>
<br>
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.<br>
<br>
I'm seeing strange behavior by Myth. Please see the following from
'mythfrontend -v audio' run on SVN revision 15283.<br>
<br>
Compile string:<br>
./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<br>
<br>
<blockquote>2008-01-07 22:52:21.279 AFD: Opened codec 0x841c3a0,
id(MPEG2VIDEO) type(Video)<br>
2008-01-07 22:52:21.280 AFD: Opened codec 0x841c720, id(AC3) type(Audio)<br>
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).<br>
2008-01-07 22:52:21.287 AFD: Selected track 1: English AC3 5.1ch (A/V
Stream #1)<br>
2008-01-07 22:52:21.287 AFD: Initializing audio parms from audio track
#1<br>
2008-01-07 22:52:21.287 AFD: Audio format changed <br>
from id(NONE) -1Hz -1ch 0bps ;
id(NONE) -1Hz -1ch 0bps <br>
to id( AC3) 48000Hz 6ch 16bps ; id( AC3)
48000Hz 2ch 16bps <br>
2008-01-07 22:52:21.291 AO: Killing AudioOutputDSP<br>
2008-01-07 22:52:21.292 Opening ALSA audio device 'plug:surround51'.<br>
2008-01-07 22:52:21.293 in SetParameters(format=2, channels=2,
rate=48000, buffer_time=500000, period_time=125000)<br>
2008-01-07 22:52:21.295 get_buffer_size returned 16384<br>
2008-01-07 22:52:21.295 set_period_time_near returned 170666<br>
2008-01-07 22:52:21.295 get_period_size returned 8192<br>
</blockquote>
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.<br>
<br>
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!<br>
<br>
-Keller<br>
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