[mythtv-users] WinTV Go 2 sound issues...

NYSSEN Peter (BMB) Peter.NYSSEN at proximus.net
Thu Dec 30 10:31:58 UTC 2004

Hi Juan,
Thanks for you reply!
Even though that's not very good news, I'm not giving up (yet :-).
I found the following thread:
It seems that there are more people seeing this.
I think the driver is ok since it works in tvtime (don't know if the
sound is set to mono, I'll check when I get home).
>From the post of toddles13 in the referenced thead it seems that 'v4lctl
volume mute off' also enables sound in MythTV.
I guess all it takes to get this working is insert some unmute-code in
the right place in MythTV to get this working.
I'm looking at the V4L2 API specification and the MythTV souce code to
see if I can find how/where to do this.
Of course, if anyone can give me a hint as to which classes/functions I
should be looking at it would be greatly appreciated.

	-----Original Message-----
	From: mythtv-users-bounces at mythtv.org
[mailto:mythtv-users-bounces at mythtv.org] On Behalf Of jgamo at cantv.net
	Sent: Thursday, December 30, 2004 10:43 AM
	To: mythtv-users at mythtv.org
	Subject: Re: RE: [mythtv-users] WinTV Go 2 sound issues...

	Hello Peter

	I had my rounds with what I think is the same card, and let me
tell you that in the end I gave up and bought another card.

	Anyway, I do remember that the driver's author say the sound is
still in progress. 

	Also, I don't know why, I could get sound in tvtime IF I chose
mono and did some magic with the alsa controls, muting some channels
that I would think they should be unmuted.

	I never got the card to work well with mythtv, sorry about that.

	Sorry that I can't help much more.

	----------- Mensaje Original -------------- 
	De: NYSSEN Peter \(BMB\) [Peter.NYSSEN at proximus.net] 
	Para: Discussion about mythtv [mythtv-users at mythtv.org]
	Asunto: RE: [mythtv-users] WinTV Go 2 sound issues...
	Fecha: 30/12/2004 04:25:00

	I've found on http://www.bttv-gallery.de that this card is
actually a WinTV Go 2.

		-----Original Message-----
		From: mythtv-users-bounces at mythtv.org
[mailto:mythtv-users-bounces at mythtv.org] On Behalf Of NYSSEN Peter (BMB)
		Sent: Wednesday, December 29, 2004 10:02 AM
		To: mythtv-users at mythtv.org
		Subject: [mythtv-users] WinTV Go sound issues...

		Hi all, 

		I'm setting up MythTV 0.16 on a friend's box. It has a
recent WinTV Go card with a Conexant chip so I'm using the cx8800 kernel

		After fiddling a bit with the hue and color settings I
got video playback and recording just fine. I wish I could say the same
about audio...

		This card has a audio line-out. For use in MythTV this
line-out is connected to the line-in of the onboard sound card. 
		I'm also using tvtime to test the drivers. When using
tvtime I connect the line-out of the WinTV Go card directly to the
amplifier of my sound system.

		I've tried both the cx8800 v4l driver with kernel 2.6.9
and the snapshot from
http://dl.bytesex.org/cvs-snapshots/video4linux-20041217-141849.tar.g z

		Here are my experiences: 

		- tvtime (non-buffered playback) works perfect with both
the 2.6.9 drivers and latest snapshot V4L drivers. Line-out of the WinTV
Go card is connected directly to my sound system.

		- mythtv with kernel 2.6.9 V4L drivers: I can't get any
sound out of this. I can change channels, playback and record video, but
without audio.

		- mythtv with V4L snapshot drivers:The same as with
kernel 2.6.9 drivers, except that with these drivers a radio device is
now also detected while loading the drivers. When I'm doing TV playback
on mythtv (without sound), and I do a 'cat /dev/v4l/radio0', the tuned
frequency of the card changes, mythtv playback switches to static, and i
_do_ get static out of the speakers all of a sudden. Note that in this
case the line-out of the WinTV Go card is connected to the line-in of
the sound card. When I now change the channel in mythtv, I get normal tv
playback _with_ audio. Video and audio are perfectly in sync. I can
change channels and audio keeps on working. If I now press the 'r' key
on the keyboard to record the live stream audio get's turned off again.
I'm watching the tv stream without sound. Also if I exit live playback
and play back the recording stream from the media library, I see that no
sound is being recorded. If I do 'cat /dev/v4l/radio0' again, I can
watch live (buffered) TV again with sound.

		There is no radio device detected with the kernel 2.6.9
cx8800 V4L driver so I can't try this with those drivers 
		As you can see in the dmesg output below, with the
snapshot drivers a radio device is created and not with the kernel 2.6.9

		Also, the snapshot drivers detect a MSP3425 audio
processor but the msp3400.ko module is not needed for audio to work. 

		Since unbuffered TV playback in tvtime is working fine
and via 'cat /dev/v4l/radio0' I can get sound output on the WinTV Go
card enabled in MythTV, I suppose the problem lies in MythTV itself.

		Has anybody seen this before? Is this card maybe not yet
supported in MythTV? Or maybe the CVS version of MythTV has some fixes
for this?

		Thanks & kind regards, 

		root # lsmod 
		Module          &nb sp;       Size  Used by 
		snd_pcm_oss         &nbs p;  48296  0 
		snd_mixer_oss          17536  1 snd_pcm_oss 
		lirc_dev          & nbsp;    10636  0 
		tuner          &nbs p;       19624  0 
		cx8800          &nb sp;      25616  0 
		v4l1_compat         &nbs p;  12804  1 cx8800 
		v4l2_common         &nbs p;   4480  1 cx8800 
		cx88xx          &nb sp;      45792  1 cx8800 
		i2c_algo_bit         &nb sp;  8328  1 cx88xx 
		video_buf               16708  2 cx8800,cx88xx 
		ir_common                3844  1 cx88xx 
		btcx_risc                3592  2 cx8800,cx88xx 
		tveeprom          & nbsp;     7364  1 cx88xx 
		i2c_core          & nbsp;    19024  4
		videodev          & nbsp;     7232  2 cx8800,cx88xx 
		usbhid          &nb sp;      22720  0 
		uhci_hcd          & nbsp;    28752  0 
		usbcore          &n bsp;    101732  4 usbhid,uhci_hcd 
		nvidia          &nb sp;    4813076  0 
		snd_via82xx         &nbs p;  22692  0 
		snd_ac97_codec         68624  1 snd_via82xx 
		snd_pcm          &n bsp;     84680  2
		snd_timer               21188  1 snd_pcm 
		snd_page_alloc          7432  2 snd_via82xx,snd_pcm 
		gameport          & nbsp;     3520  1 snd_via82xx 
		snd_mpu401_uart         6080  1 snd_via82xx 
		snd_rawmidi         &nbs p;  19684  1 snd_mpu401_uart 
		snd                     45796  8
nd_m pu401_uart,snd_rawmidi

		soundcore                7328  1 snd 

		dmesg when kernel 2.6.9 V4L drivers are loaded: 

		cx88xx: Unknown parameter `audio_debug' 
		Linux video capture interface: v1.00 
		cx2388x v4l2 driver version 0.0.4 loaded 
		cx8800[0]: found at 0000:00:06.0, rev: 3, irq: 10,
latency: 32, mmio: 0xde000000 
		cx8800[0]: subsystem: 0070:3401, board: Hauppauge WinTV
34xxx models [card=1,autodetected] 
		cx8800[0]: i2c register ok 
		cx8800[0]: hauppauge eeprom: model=34704, tuner=LG
TPI8PSB11D (29), radio=no 
		tuner: Ignoring new-style parameters in presence of
obsolete ones 
		tuner: chip found at addr 0xc2 i2c-bus cx8800[0] 
		tuner: type set to 29 (LG PAL_BG (TPI8PSB11D)) by
		cx8800[0]: i2c attach [client=LG PAL_BG (TPI8PSB11D)] 
		cx8800[0]: registered device video0 [v4l2] 
		cx8800[0]: registered device vbi0 
		cx8800[0]: set_audio_standard_BTSC (status: known-good) 
		cx8800[0]: cx88: tvaudio thread started 
		lirc_dev: IR Remote Control driver registered, at major

		dmesg when latest snapshot V4L drivers are loaded: 

		Linux video capture interface: v1.00 
		cx2388x v4l2 driver version 0.0.4 loaded 
		cx2388x: snapshot date 2004-12-17 
		cx88[0]: subsystem: 0070:3401, board: Hauppauge WinTV
34xxx models [card=1,autodetected] 
		tveeprom: Hauppauge: model = 34704, rev = E148, serial#
= 6436853 
		tveeprom: tuner = LG TP18PSB11D (idx = 48, type = 29) 
		tveeprom: tuner fmt = PAL(B/G) (eeprom = 0x04, v4l2 =
		tveeprom: audio_processor = MSP3425 (type = 15) 
		cx88[0]: registered IR remote control 
		cx88[0]/0: found at 0000:00:06.0, rev: 3, irq: 10,
latency: 32, mmio: 0xde000000 
		tuner: chip found at addr 0xc2 i2c-bus cx88[0] 
		tuner: type set to 29 (LG PAL_BG (TPI8PSB11D)) by
		cx88[0]/0: registered device video0 [v4l2] 
		cx88[0]/0: registered device vbi0 
		cx88[0]/0: registered device radio0 
		lirc_dev: IR Remote Control driver registered, at major



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