I have three seperate machines outputting to a Sony STR-DB940 AC3 Amp
via SPDIF (two optical one RCA).
I can get all of them to output as standard ALSA devices from Fedora 7
setups and no specific asound.conf or asound.rc files however I
cannot for the life of me get AC3 passthrough to work on any of them
(using either VLC or MPLAYER).
Here's one of the setups....
aplay -l
**** List of PLAYBACK Hardware Devices ****
card 0: CK804 [NVidia CK804], device 0: Intel ICH [NVidia CK804]
Subdevices: 0/1
Subdevice #0: subdevice #0
card 0: CK804 [NVidia CK804], device 2: Intel ICH - IEC958 [NVidia
CK804 - IEC958]
Subdevices: 1/1
Subdevice #0: subdevice #0
aplay -L
default:CARD=CK804
NVidia CK804, NVidia CK804
Default Audio Device
front:CARD=CK804,DEV=0
NVidia CK804, NVidia CK804
Front speakers
surround40:CARD=CK804,DEV=0
NVidia CK804, NVidia CK804
4.0 Surround output to Front and Rear speakers
surround41:CARD=CK804,DEV=0
NVidia CK804, NVidia CK804
4.1 Surround output to Front, Rear and Subwoofer speakers
surround50:CARD=CK804,DEV=0
NVidia CK804, NVidia CK804
5.0 Surround output to Front, Center and Rear speakers
surround51:CARD=CK804,DEV=0
NVidia CK804, NVidia CK804
5.1 Surround output to Front, Center, Rear and Subwoofer speakers
null
Discard all samples (playback) or generate zero samples (capture)
Now I understand that the Surround stuff in aplay -L refers to multi
connected surround and not over spdif however I would expect either a
spdif or iec958 device there shouldn't I?
If I try to output from mplayer on a file I know has AC3 using the command line
mplayer -ac hwac3 ac3test.avi
this is what I get.....but no sound from the amp.
MPlayer dev-SVN-rUNKNOWN-4.1.2 (C) 2000-2007 MPlayer Team
CPU: AMD Athlon(tm) 64 Processor 3200+ (Family: 15, Model: 31, Stepping: 0)
CPUflags: MMX: 1 MMX2: 1 3DNow: 1 3DNow2: 1 SSE: 1 SSE2: 1
Compiled with runtime CPU detection.
Playing ac3test.avi.
AVI file format detected.
[aviheader] Video stream found, -vid 0
[aviheader] Audio stream found, -aid 1
VIDEO: [XVID] 576x304 24bpp 25.000 fps 1141.0 kbps (139.3 kbyte/s)
Clip info:
Software: VirtualDubMod 1.4.13
==========================================================================
Opening video decoder: [ffmpeg] FFmpeg's libavcodec codec family
Selected video codec: [ffodivx] vfm: ffmpeg (FFmpeg MPEG-4)
==========================================================================
==========================================================================
Forced audio codec: hwac3
Opening audio decoder: [hwac3] AC3/DTS pass-through S/PDIF
hwac3: switched to AC3, 384000 bps, 48000 Hz
AUDIO: 48000 Hz, 2 ch, ac3, 384.0 kbit/25.00% (ratio: 48000->192000)
Selected audio codec: [hwac3] afm: hwac3 (AC3 through S/PDIF)
==========================================================================
AO: [alsa] 48000Hz 2ch ac3 (1 bytes per sample)
Starting playback...
VDec: vo config request - 576 x 304 (preferred colorspace: Planar YV12)
VDec: using Planar YV12 as output csp (no 0)
Movie-Aspect is 1.89:1 - prescaling to correct movie aspect.
VO: [xv] 576x304 => 576x304 Planar YV12
using just mplayer and the filename I get normal (2 channel) sound
from the amp and this...
mplayer ac3test.avi
MPlayer dev-SVN-rUNKNOWN-4.1.2 (C) 2000-2007 MPlayer Team
CPU: AMD Athlon(tm) 64 Processor 3200+ (Family: 15, Model: 31, Stepping: 0)
CPUflags: MMX: 1 MMX2: 1 3DNow: 1 3DNow2: 1 SSE: 1 SSE2: 1
Compiled with runtime CPU detection.
Playing ac3test.avi.
AVI file format detected.
[aviheader] Video stream found, -vid 0
[aviheader] Audio stream found, -aid 1
VIDEO: [XVID] 576x304 24bpp 25.000 fps 1141.0 kbps (139.3 kbyte/s)
Clip info:
Software: VirtualDubMod 1.4.13
==========================================================================
Opening video decoder: [ffmpeg] FFmpeg's libavcodec codec family
Selected video codec: [ffodivx] vfm: ffmpeg (FFmpeg MPEG-4)
==========================================================================
==========================================================================
Opening audio decoder: [liba52] AC3 decoding with liba52
AUDIO: 48000 Hz, 2 ch, s16le, 384.0 kbit/25.00% (ratio: 48000->192000)
Selected audio codec: [a52] afm: liba52 (AC3-liba52)
==========================================================================
AO: [alsa] 48000Hz 2ch s16le (2 bytes per sample)
Starting playback...
VDec: vo config request - 576 x 304 (preferred colorspace: Planar YV12)
VDec: using Planar YV12 as output csp (no 0)
Movie-Aspect is 1.89:1 - prescaling to correct movie aspect.
VO: [xv] 576x304 => 576x304 Planar YV12
Any ideas anyone please?
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