[mythtv-users] Poor sound quality cmipci

Adrian Burden aburden at onegeeksopinion.com
Sun May 18 16:40:28 EDT 2003


I had similar issues with sound. I had setup to record line in, and
could not figure out why the sound was hissing and distorted. It sounded
like it was being over amplified. I just started playing around with
alsamixer and found that I had a 'AC97' and 'AC97 Cap'. I had to turn
down the AC97, and turn up AC97 Cap. 

Cheers...

-----Original Message-----
From: mythtv-users-bounces at snowman.net
[mailto:mythtv-users-bounces at snowman.net] On Behalf Of Christopher Ferry
Sent: Sunday, May 18, 2003 11:25 AM
To: mythtv-users at snowman.net
Subject: [mythtv-users] Poor sound quality cmipci


I've finally gotten mythtv setup and running with
capture using the following equipment:
Asus A7A333 (Think thats right)
CM8738 onboard sound
WinTv Go
Athlon 1700+
256Mb Ram

Systems encode and decodes the video just fine, but
the audio is just crap.  Hissing and low volume.
I've messed with the levels in ALSA mixer for an hour
or two to no avail.  Then I moved the sound feed from
line-in to mic-in after reading a post. That did
nothing as well.  I also tried all three encoding
levels. No discernable difference in sound quality
either.  Below I've provided some info that might
help.  If anyone has any ideas I'd be happy to hear
them!

Thanks

Chris


<-- Snippet from /proc/pci -->
 Bus  0, device   5, function  0:
    Multimedia audio controller: C-Media Electronics
Inc CM8738 (rev 16).
      IRQ 10.
      Master Capable.  Latency=32.  Min Gnt=2.Max
Lat=24.
      I/O at 0xa000 [0xa0ff].
  Bus  0, device   9, function  0:
    Ethernet controller: Lite-On Communications Inc
LNE100TX (rev 32).
      IRQ 10.
      Master Capable.  Latency=32.
      I/O at 0x9800 [0x98ff].
      Non-prefetchable 32 bit memory at 0xe6000000 [0xe60000ff].
  Bus  0, device  11, function  0:
    Multimedia video controller: Brooktree Corporation
Bt878 Video Capture (rev 17).
      IRQ 5.
      Master Capable.  Latency=32.  Min Gnt=16.Max
Lat=40.
      Prefetchable 32 bit memory at 0xef000000
[0xef000fff].
  Bus  0, device  11, function  1:
    Multimedia controller: Brooktree Corporation Bt878
Audio Capture (rev 17).
      IRQ 5.
      Master Capable.  Latency=32.  Min Gnt=4.Max
Lat=255.
      Prefetchable 32 bit memory at 0xee800000
[0xee800fff].
  Bus  1, device   0, function  0:
<-- End pci snippet -->
<-- Begin lsmod output -->
bash-2.05b$ /sbin/lsmod
Module                  Size  Used by    Not tainted
isofs                  27988   1 (autoclean)
zlib_inflate           21156   0 (autoclean) [isofs]
udf                    90464   0 (autoclean)
radeon                108484  23
agpgart                40896   3 (autoclean)
autofs4                11540   2 (autoclean)
parport_pc             25096   1 (autoclean)
lp                      8096   0 (autoclean)
parport                34176   1 (autoclean)
[parport_pc lp]
nls_cp437               5148   3 (autoclean)
nls_iso8859-1           3516   4 (autoclean)
smbfs                  40144   3 (autoclean)
snd-seq-midi            5024   0 (autoclean) (unused)
snd-opl3-synth         12548   0 (autoclean) (unused)
snd-seq-instr           7172   0 (autoclean)
[snd-opl3-synth]
snd-seq-midi-emul       6780   0 (autoclean)
[snd-opl3-synth]
snd-ainstr-fm           2912   0 (autoclean)
[snd-opl3-synth]
snd-seq-oss            31104   0 (unused)
snd-seq-midi-event      5640   0 [snd-seq-midi
snd-seq-oss]
snd-seq                42608   2 [snd-seq-midi
snd-opl3-synth snd-seq-instr snd-seq-midi-emul
snd-seq-oss snd-seq-midi-event]
snd-pcm-oss            43556   0
snd-mixer-oss          14488   0 [snd-pcm-oss]
snd-cmipci             23200   0
snd-pcm                77536   0 [snd-pcm-oss
snd-cmipci]
snd-page-alloc          7732   0 [snd-pcm]
snd-opl3-lib            8036   0 [snd-opl3-synth
snd-cmipci]
snd-timer              18376   0 [snd-seq snd-pcm
snd-opl3-lib]
snd-hwdep               6368   0 [snd-opl3-lib]
snd-mpu401-uart         4396   0 [snd-cmipci]
snd-rawmidi            17600   0 [snd-seq-midi
snd-mpu401-uart]
snd-seq-device          5832   0 [snd-seq-midi
snd-opl3-synth snd-seq-oss snd-seq snd-opl3-lib
snd-rawmidi]
snd                    40868   0 [snd-seq-midi
snd-opl3-synth snd-seq-instr snd-seq-oss
snd-seq-midi-event snd-seq snd-pcm-oss snd-mixer-oss
snd-cmipci snd-pcm snd-opl3-lib snd-timer snd-hwdep snd-mpu401-uart
snd-rawmidi snd-seq-device]
nfsd                   74256   8 (autoclean)
af_packet              14952   2 (autoclean)
sr_mod                 16920   0 (autoclean)
tulip                  44032   1 (autoclean)
supermount             15296   2 (autoclean)
reiserfs              190736   1 (autoclean)
ide-cd                 33856   2
cdrom                  31648   0 [sr_mod ide-cd]
tvaudio                15068   0 (autoclean) (unused)
bttv                   78496   0
videodev                7872   2 [bttv]
i2c-algo-bit            9064   1 [bttv]
soundcore               6276   0 [snd bttv]
ide-scsi               11280   0
scsi_mod              103284   2 [sr_mod ide-scsi]
tuner                  11744   1
i2c-core               21192   0 [tvaudio bttv
i2c-algo-bit tuner]
ati_remote              6424   0 (unused)
evdev                   5632   0 (unused)
usbmouse                2936   0 (unused)
usbkbd                  4440   0 (unused)
keybdev                 2720   0 (unused)
mousedev                5268   0 (unused)
hid                    20900   0 (unused)
input                   5664   0 [ati_remote evdev
usbmouse usbkbd keybdev mousedev hid]
usb-ohci               20584   0 (unused)
usbcore                72992   1 [ati_remote usbmouse
usbkbd hid usb-ohci]
rtc                     8060   0 (autoclean)
xfs                   434546   6
<-- End lsmod -->

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