[mythtv-users] bt878 audio problems

David Frey dpfrey at shaw.ca
Wed Nov 3 05:24:16 UTC 2004


I have this card (from 
kernel_source/Documentation/video4linux/CARDLIST.bttv)
card=58 - Askey CPH060/ Phoebe TV Master Only (No FM)

I am having trouble getting any audio when I watch or record TV.  I have 
the snd_bt87x module installed.  My understanding is that this should 
allow me to record directly from the tv-tuner card and should not 
require a patch cable.

Under "capture cards" in mythtv-setup, I have /dev/dsp1 selected as my 
audio device for recording.  I'm not really sure whether this is 
correct, or how to verify whether it is correct or not.  What I do know 
is that /dev/dsp is my soundcard.

alsamixer -c 1 is showing the tv tuner.  "capture" is at 73 and "TV 
tuner" is selected as the capture device rather than "Mic/Line".

If anyone has any ideas how I can solve this problem or narrow the 
scope, please tell me.  Also, let me know if there is any other 
information that would be useful.

Thanks,
David Frey

Here is my lsmod output:
$ lsmod
Module                  Size  Used by
ide_cd                 42080  0
cdrom                  40156  1 ide_cd
sg                     34464  0
scsi_mod               83584  1 sg
af_packet              18248  2
snd_bt87x              14536  0
3c59x                  38632  0
snd_cmipci             33156  2
snd_pcm_oss            54312  1
snd_mixer_oss          19904  2 snd_pcm_oss
snd_pcm                94920  3 snd_bt87x,snd_cmipci,snd_pcm_oss
snd_page_alloc         11720  2 snd_bt87x,snd_pcm
snd_opl3_lib           10688  1 snd_cmipci
snd_timer              25540  2 snd_pcm,snd_opl3_lib
snd_hwdep               9476  1 snd_opl3_lib
snd_mpu401_uart         8000  1 snd_cmipci
snd_rawmidi            24740  1 snd_mpu401_uart
snd                    52388  10 
snd_bt87x,snd_cmipci,snd_pcm_oss,snd_mixer_oss,snd_pcm,snd_opl3_lib,snd_timer,snd_hwdep,snd_mpu401_uart,snd_rawmidi
ohci_hcd               17924  0
usbcore               116260  3 ohci_hcd
evdev                   9344  0
sis_agp                 8260  1
agpgart                34472  1 sis_agp
tuner                  19920  0
tvaudio                22348  0
bttv                  153420  0
video_buf              22020  1 bttv
i2c_algo_bit            9800  1 bttv
v4l2_common             6208  1 bttv
btcx_risc               4808  1 bttv
i2c_core               24144  4 tuner,tvaudio,bttv,i2c_algo_bit
videodev                9728  1 bttv
soundcore              10016  4 snd,bttv
unix                   28596  308

Here is my lspci -v for my tv-tuner card:
0000:00:0c.0 Multimedia video controller: Brooktree Corporation Bt878 
Video Capture (rev 02)
        Subsystem: Askey Computer Corp. MagicTView CPH060 - Video
        Flags: bus master, medium devsel, latency 32, IRQ 5
        Memory at fb000000 (32-bit, prefetchable) [size=4K]

0000:00:0c.1 Multimedia controller: Brooktree Corporation Bt878 Audio 
Capture (rev 02)
        Subsystem: Askey Computer Corp. MagicTView CPH060 - Audio
        Flags: bus master, medium devsel, latency 32, IRQ 5
        Memory at fa800000 (32-bit, prefetchable) [size=4K]



More information about the mythtv-users mailing list