Hello. I love MythTv. I have been using it for about a month now. I have an Athlon 1.6 Mhz with 256 Meg Ram and an 80 Gb Hard drive. My sound card is a C-Media cmi-8738. My capture card is a Haupgauge Win TV-GO. I have been searching the forums and also googling for about a week. The problem that I am having is I have terrible audio static when I watch or capture TV. If I use v4lctl and mute the audio and then use alsamixer to unmute i have clear audio but of course it is out of sync with the video. I have tried different cables between the capture card and my soundcard. I upgraded alsa to 1.05. I know that I am probably doing something stupid so please help me out.

I know that you might need to see some logs but I am not sure which ones. I have included lsmod and dmesg.

dmesg

Linux version 2.4.25-chw (root@km_dev.mysettopbox.tv) (gcc version 3.3.2 20030812 (Debian prerelease)) #1 Sat Apr 10 15:46:31 PDT 2004
BIOS-provided physical RAM map:
BIOS-e820: 0000000000000000 - 000000000009fc00 (usable)
BIOS-e820: 000000000009fc00 - 00000000000a0000 (reserved)
BIOS-e820: 00000000000f0000 - 0000000000100000 (reserved)
BIOS-e820: 0000000000100000 - 0000000010000000 (usable)
BIOS-e820: 00000000fec00000 - 00000000fec01000 (reserved)
BIOS-e820: 00000000fee00000 - 00000000fee01000 (reserved)
BIOS-e820: 00000000fff80000 - 0000000100000000 (reserved)
0MB HIGHMEM available.
256MB LOWMEM available.
On node 0 totalpages: 65536
zone(0): 4096 pages.
zone(1): 61440 pages.
zone(2): 0 pages.
Kernel command line: auto BOOT_IMAGE=Linux ro root=301 hda=scsi hdb=scsi hdc=scsi hdd=scsi hde=scsi hdf=scsi hdg=scsi hdh=scsi apm=power-off nomce
ide_setup: hda=scsi
ide_setup: hdb=scsi
ide_setup: hdc=scsi
ide_setup: hdd=scsi
ide_setup: hde=scsi
ide_setup: hdf=scsi
ide_setup: hdg=scsi
ide_setup: hdh=scsi
Initializing CPU#0
Detected 1600.090 MHz processor.
Console: colour VGA+ 80x25
Calibrating delay loop... 3191.60 BogoMIPS
Memory: 256268k/262144k available (1363k kernel code, 5488k reserved, 490k data, 116k init, 0k highmem)
Dentry cache hash table entries: 32768 (order: 6, 262144 bytes)
Inode cache hash table entries: 16384 (order: 5, 131072 bytes)
Mount cache hash table entries: 512 (order: 0, 4096 bytes)
Buffer cache hash table entries: 16384 (order: 4, 65536 bytes)
Page-cache hash table entries: 65536 (order: 6, 262144 bytes)
CPU: L1 I Cache: 64K (64 bytes/line), D cache 64K (64 bytes/line)
CPU: L2 Cache: 256K (64 bytes/line)
CPU: After generic, caps: 0383f9ff c1cbf9ff 00000000 00000000
CPU: Common caps: 0383f9ff c1cbf9ff 00000000 00000000
CPU: AMD mobile AMD Athlon(tm) XP-M 1900+ stepping 00
Enabling fast FPU save and restore... done.
Enabling unmasked SIMD FPU exception support... done.
Checking 'hlt' instruction... OK.
POSIX conformance testing by UNIFIX
mtrr: v1.40 (20010327) Richard Gooch (rgooch@atnf.csiro.au)
mtrr: detected mtrr type: Intel
PCI: PCI BIOS revision 2.10 entry at 0xfdaf1, last bus=1
PCI: Using configuration type 1
PCI: Probing PCI hardware
PCI: Probing PCI hardware (bus 00)
PCI: Using IRQ router default [1106/3177] at 00:11.0
PCI: Hardcoded IRQ 14 for device 00:11.1
isapnp: Scanning for PnP cards...
isapnp: No Plug & Play device found
Linux NET4.0 for Linux 2.4
Based upon Swansea University Computer Society NET3.039
Initializing RT netlink socket
Starting kswapd
VFS: Disk quotas vdquot_6.5.1
pty: 256 Unix98 ptys configured
Floppy drive(s): fd0 is 1.44M
FDC 0 is a post-1991 82077
RAMDISK driver initialized: 16 RAM disks of 4096K size 1024 blocksize
loop: loaded (max 8 devices)
Uniform Multi-Platform E-IDE driver Revision: 7.00beta4-2.4
ide: Assuming 33MHz system bus speed for PIO modes; override with idebus=xx
VP_IDE: IDE controller at PCI slot 00:11.1
PCI: Hardcoded IRQ 14 for device 00:11.1
VP_IDE: chipset revision 6
VP_IDE: not 100% native mode: will probe irqs later
VP_IDE: VIA vt8235 (rev 00) IDE UDMA133 controller on pci00:11.1
ide0: BM-DMA at 0xfc00-0xfc07, BIOS settings: hda:DMA, hdb:pio
ide1: BM-DMA at 0xfc08-0xfc0f, BIOS settings: hdc:DMA, hdd:pio
hda: ST380011A, ATA DISK drive
hdc: IDE DVD-ROM 16X, ATAPI CD/DVD-ROM drive
ide0 at 0x1f0-0x1f7,0x3f6 on irq 14
ide1 at 0x170-0x177,0x376 on irq 15
hda: attached ide-disk driver.
hda: host protected area => 1
hda: 156301488 sectors (80026 MB) w/2048KiB Cache, CHS=9729/255/63
ide-cd: passing drive hdc to ide-scsi emulation.
hdc: attached ide-scsi driver.
Partition check:
hda: hda1 hda2 hda3 hda4
ide: late registration of driver.
Promise Fasttrak(tm) Softwareraid driver 0.03beta: No raid array found
Highpoint HPT370 Softwareraid driver for linux version 0.02
Guestimating sector 156280064 for superblock
driver for Silicon Image(tm) Medley(tm) hardware version 0.0.1: No raid array found
SCSI subsystem driver Revision: 1.00
scsi0 : SCSI host adapter emulation for IDE ATAPI devices
Vendor: IDE Model: DVD-ROM 16X Rev: 3.10
Type: CD-ROM ANSI SCSI revision: 02
Attached scsi CD-ROM sr0 at scsi0, channel 0, id 0, lun 0
sr0: scsi3-mmc drive: 16x/16x cd/rw xa/form2 cdda tray
Uniform CD-ROM driver Revision: 3.12
Initializing Cryptographic API
NET4: Linux TCP/IP 1.0 for NET4.0
IP Protocols: ICMP, UDP, TCP, IGMP
IP: routing cache hash table of 2048 buckets, 16Kbytes
TCP: Hash tables configured (established 16384 bind 32768)
NET4: Unix domain sockets 1.0/SMP for Linux NET4.0.
RAMDISK: Compressed image found at block 0
Freeing initrd memory: 150k freed
VFS: Mounted root (ext2 filesystem).
Journalled Block Device driver loaded
(recovery.c, 256): journal_recover: JBD: recovery, exit status 0, recovered transactions 65931 to 67112
(recovery.c, 258): journal_recover: JBD: Replayed 2292 and revoked 0/2 blocks
kjournald starting. Commit interval 5 seconds
EXT3 FS 2.4-0.9.19, 19 August 2002 on ide0(3,1), internal journal
ext3_orphan_cleanup: deleting unreferenced inode 145161
ext3_orphan_cleanup: deleting unreferenced inode 144992
EXT3-fs: ide0(3,1): 2 orphan inodes deleted
EXT3-fs: recovery complete.
EXT3-fs: mounted filesystem with ordered data mode.
Freeing unused kernel memory: 116k freed
Adding Swap: 883564k swap-space (priority -1)
EXT3 FS 2.4-0.9.19, 19 August 2002 on ide0(3,1), internal journal
Real Time Clock Driver v1.10f
usb.c: registered new driver usbdevfs
usb.c: registered new driver hub
usb-uhci.c: $Revision: 1.275 $ time 16:10:01 Apr 10 2004
usb-uhci.c: High bandwidth mode enabled
usb-uhci.c: USB UHCI at I/O 0xe800, IRQ 5
usb-uhci.c: Detected 2 ports
usb.c: new USB bus registered, assigned bus number 1
hub.c: USB hub found
hub.c: 2 ports detected
usb-uhci.c: USB UHCI at I/O 0xe400, IRQ 10
usb-uhci.c: Detected 2 ports
usb.c: new USB bus registered, assigned bus number 2
hub.c: USB hub found
hub.c: 2 ports detected
usb-uhci.c: USB UHCI at I/O 0xe000, IRQ 11
usb-uhci.c: Detected 2 ports
usb.c: new USB bus registered, assigned bus number 3
hub.c: USB hub found
hub.c: 2 ports detected
usb-uhci.c: v1.275:USB Universal Host Controller Interface driver
Serial driver version 5.05c (2001-07-08) with MANY_PORTS SHARE_IRQ SERIAL_PCI ISAPNP enabled
ttyS00 at 0x03f8 (irq = 4) is a 16550A
Linux video capture interface: v1.00
i2c-core.o: i2c core module version 2.6.1 (20010830)
i2c-algo-bit.o: i2c bit algorithm module
bttv: driver version 0.9.15 loaded
bttv: using 8 buffers with 2080k (520 pages) each for capture
bttv: Bt8xx card found (0).
bttv0: Bt878 (rev 17) at 00:09.0, irq: 10, latency: 32, mmio: 0xdddfe000
bttv0: detected: Hauppauge WinTV [card=10], PCI subsystem ID is 0070:13eb
bttv0: using: Hauppauge (bt878) [card=10,autodetected]
bttv0: gpio: en=00000000, out=00000000 in=00fffffb [init]
bttv0: Hauppauge/Voodoo msp34xx: reset line init [5]
i2c-core.o: adapter bt878 #0 [sw] registered as adapter 0.
bttv0: Hauppauge eeprom: model=38101, tuner=Temic 4036FY5 (8), radio=no
bttv0: using tuner=8
bttv0: i2c: checking for MSP34xx @ 0x80... not found
bttv0: i2c: checking for TDA9875 @ 0xb0... not found
bttv0: i2c: checking for TDA7432 @ 0x8a... not found
tvaudio: TV audio decoder + audio/video mux driver
tvaudio: known chips: tda9840,tda9873h,tda9874h/a,tda9850,tda9855,tea6300,tea6420,tda8425,pic16c54 (PV951),ta8874z
i2c-core.o: driver generic i2c audio driver registered.
i2c-core.o: driver i2c TV tuner driver registered.
tuner: chip found at addr 0xc2 i2c-bus bt878 #0 [sw]
tuner: type set to 8 (Temic NTSC (4036 FY5)) by bt878 #0 [sw]
i2c-core.o: client [Temic NTSC (4036 FY5)] registered to adapter [bt878 #0 [sw]](pos. 0).
hub.c: new USB device 00:10.2-2, assigned address 2
bttv0: registered device video0
bttv0: registered device vbi0
bttv0: PLL: 28636363 => 35468950 ..<4>usb.c: USB device 2 (vend/prod 0x47d/0x4006) is not claimed by any active driver.
ok
via-rhine.c:v1.10-LK1.1.19 July-12-2003 Written by Donald Becker
http://www.scyld.com/network/via-rhine.html
eth0: VIA VT6102 Rhine-II at 0xdffffe00, 00:0d:87:b8:06:a2, IRQ 11.
eth0: MII PHY found at address 1, status 0x786d advertising 05e1 Link 45e1.
Linux agpgart interface v0.99 (c) Jeff Hartmann
agpgart: Maximum main memory to use for agp memory: 204M
agpgart: Detected Via Apollo Pro KM266 / KL266 chipset
agpgart: AGP aperture is 64M @ 0xe0000000
ttyS1: LSR safety check engaged!
ttyS1: LSR safety check engaged!
usb.c: registered new driver hiddev
usb.c: registered new driver hid
kjournald starting. Commit interval 5 seconds
EXT3 FS 2.4-0.9.19, 19 August 2002 on ide0(3,4), internal journal
usb-uhci.c: interrupt, status 2, frame# 1590
EXT3-fs: mounted filesystem with ordered data mode.
eth0: Setting full-duplex based on MII #1 link partner capability of 45e1.
eth0: Setting full-duplex based on MII #1 link partner capability of 45e1.
blk: queue c0316080, I/O limit 4095Mb (mask 0xffffffff)
usb_control/bulk_msg: timeout
usb-uhci.c: interrupt, status 3, frame# 454
input: USB HID v1.10 Gamepad [Gravis Eliminator AfterShock ] on usb1:2.0
hid-core.c: v1.8.1 Andreas Gal, Vojtech Pavlik <vojtech@suse.cz>
hid-core.c: USB HID support drivers
apm: BIOS not found.
bttv0: PLL can sleep, using XTAL (28636363).
NVRM: loading NVIDIA Linux x86 NVIDIA Kernel Module 1.0-6629 Wed Nov 3 13:12:51 PST 2004
lirc_dev: IR Remote Control driver registered, at major 61
i2c-core.o: driver i2c ir driver registered.

lsmod
Module Size Used by Tainted: P
lirc_i2c 4448 0 (autoclean) (unused)
lirc_dev 8592 0 (autoclean) [lirc_i2c]
nvidia 3206232 6 (autoclean)
hid 20164 0 (unused)
input 3200 0 [hid]
autofs4 9332 0 (unused)
af_packet 14632 0
snd-cmipci 18104 0
snd-pcm-oss 36420 0 (unused)
snd-mixer-oss 11640 0 [snd-pcm-oss]
snd-pcm 56032 0 [snd-cmipci snd-pcm-oss]
snd-page-alloc 4316 0 [snd-pcm]
snd-opl3-lib 5796 0 [snd-cmipci]
snd-hwdep 4576 0 [snd-opl3-lib]
snd-timer 14088 0 [snd-pcm snd-opl3-lib]
snd-mpu401-uart 3168 0 [snd-cmipci]
snd-rawmidi 13088 0 [snd-mpu401-uart]
snd-seq-device 3840 0 [snd-opl3-lib snd-rawmidi]
snd 27940 0 [snd-cmipci snd-pcm-oss snd-mixer-oss snd-pcm snd-opl3-lib snd-hwdep snd-timer snd-mpu401-uart snd-rawmidi snd-seq-device]
agpgart 42852 3
via-rhine 12912 1
mii 2176 0 [via-rhine]
crc32 2848 0 [via-rhine]
tuner 12712 1 (autoclean)
tvaudio 13064 0 (autoclean) (unused)
bttv 110572 0
video-buf 11392 0 [bttv]
btcx-risc 2216 0 [bttv]
i2c-algo-bit 7048 1 [bttv]
i2c-core 12452 0 [lirc_i2c tuner tvaudio bttv i2c-algo-bit]
soundcore 3524 7 [snd bttv]
videodev 6016 2 [bttv]
v4l2-common 3104 0 [bttv]
serial 44708 0
usb-uhci 22960 0 (unused)
usbcore 59980 0 [hid usb-uhci]
rtc 7432 0
ext3 65604 2
jbd 47952 2 [ext3]

Thanks for your help.

mikemcc11

I kept searching. I am amazed at what a small change if the text you are searching for can really change the results. Anyway, what I seem to have found is that the problem is actually caused by the sound card hardware. It is apparently not able to handle full duplex sound (capture and playback). Going to test that.

mikemcc11

For those with this same problem like me, this thread appears to be continued here.

But Mike, I have the same sound card and problem and am wondering if you ever found out if the problem is a hardware limitation of this card? I would think it odd that a sound card in this day and age (I just bought mine new) can't do full duplex. Unless it's just a poor linux driver??

Steve