Mailing List Archive: Tuners and Audio, was: B&W Picture and Channels off....

Tuners and Audio, was: B&W Picture and Channels off....

Mar 19, 2003, 3:58 PM

Post #1 of 5 (1777 views)

Ray Olszewski wrote:

> I don't know what you are seeing that you call "noticeably noisier",
> but I wonder if you are trying to tune the hrc range using the Canada
> settings and getting near-misses. If so, you might try ntsc-hrc. The
> same suggestion *may* apply to the original poster in this thread,
> depending on which US setting he's been trying.

Interesting, I'll have to try that next. I took a little look, and the
bttv driver *was* autodetecting the wrong tuner (some PAL tuner, when
I'm almost certain I have a phillips one). After changing that to
tuner=2, I still had a pretty noisy picture (compared to the same
channels under windows, a lot more static). I'll see if the HRC setting
makes a big difference or not.

In a probably unrelated problem, I'm having a weird issue with sound.
I'm not using btaudio (not compiled into my kernel and I can't find the
where in menuconfig I can choose to compile it), but I am getting audio
through the soundcard connection. Oddly, however, it's a *lot* quieter
than windows, and I only get the left channel, not the right. I double
checked my ALSA mixer settings, and the aux line is muted and has full
record volume set. Any ideas about this would be appreciated. :)

Graeme

Re: Tuners and Audio, was: B&W Picture and Channels off.... [ In reply to ]

ray at comarre

Mar 19, 2003, 4:16 PM

Post #2 of 5 (1701 views)

Permalink

At 04:58 PM 3/19/2003 -0600, Unit3 wrote:
>Ray Olszewski wrote:
>
>>I don't know what you are seeing that you call "noticeably noisier",
>>but I wonder if you are trying to tune the hrc range using the Canada
>>settings and getting near-misses. If so, you might try ntsc-hrc. The same
>>suggestion *may* apply to the original poster in this thread, depending
>>on which US setting he's been trying.
>
>Interesting, I'll have to try that next. I took a little look, and the
>bttv driver *was* autodetecting the wrong tuner (some PAL tuner, when I'm
>almost certain I have a phillips one). After changing that to tuner=2, I
>still had a pretty noisy picture (compared to the same channels under
>windows, a lot more static). I'll see if the HRC setting makes a big
>difference or not.

There are several tuner types that could match "a phillips one", even one
you know uses NTSC. tuner=2 is one choice, but not the only one. Check the
CARDLIST in your kernel-video4linux-bttv Documentation, as I suggested
before, for the details.

>In a probably unrelated problem, I'm having a weird issue with sound. I'm
>not using btaudio (not compiled into my kernel and I can't find the where
>in menuconfig I can choose to compile it),

On my (2.4.19, Debian package) kernel tree, it's the first item in the
Sound menu ("BT878 audio dma") under a checked "Sound card support" item.

>but I am getting audio through the soundcard connection. Oddly, however,
>it's a *lot* quieter than windows, and I only get the left channel, not
>the right. I double checked my ALSA mixer settings, and the aux line is
>muted and has full record volume set. Any ideas about this would be
>appreciated. :)

No thoughts here, I regret to say.

Re: Tuners and Audio, was: B&W Picture and Channels off.... [ In reply to ]

unit3 at demoni

Mar 19, 2003, 5:30 PM

Post #3 of 5 (1712 views)

Permalink

Ray Olszewski wrote:

> There are several tuner types that could match "a phillips one", even
> one you know uses NTSC. tuner=2 is one choice, but not the only one.
> Check the CARDLIST in your kernel-video4linux-bttv Documentation, as I
> suggested before, for the details.

Ah yes, you were right. Normal us-cable, and tuner 17 solved my all my
reception problems. That's right, to everyone out there, the ATI TV
Wonder (non-VE) uses bttv tuner 17, not whatever it autodetects! That
should be enough for archive searches to find. ;)

> On my (2.4.19, Debian package) kernel tree, it's the first item in the
> Sound menu ("BT878 audio dma") under a checked "Sound card support" item.

Ahhh would you look at that, it was there the whole time. :P Thanks!

>> but I am getting audio through the soundcard connection. Oddly,
>> however, it's a *lot* quieter than windows, and I only get the left
>> channel, not the right. I double checked my ALSA mixer settings, and
>> the aux line is muted and has full record volume set. Any ideas about
>> this would be appreciated. :)
>
I figured that using btaudio would solve (or at least work around) this
problem. However, I can't figure out how to get mythtv to capture from
btaudio... I think the problem lies in that I'm using ALSA for my sound
card, and btaudio is a part of the OSS and not ALSA drivers. I could be
completely off base here. Anyway, kmix shows 3 audio line ins for
btaudio, and setting any of them to record produces no sound in MythTV.
Ideas?

Graeme

Re: Tuners and Audio, was: B&W Picture and Channels off.... [ In reply to ]

gtgj at pacbell

Mar 19, 2003, 6:29 PM

Post #4 of 5 (1723 views)

Permalink

>>>>> On Wed, 19 Mar 2003 18:30:18 -0600, Unit3 <unit3@demoni.ca> said:

g> I figured that using btaudio would solve (or at least work around)
g> this problem. However, I can't figure out how to get mythtv to capture
g> from btaudio... I think the problem lies in that I'm using ALSA for my
g> sound card, and btaudio is a part of the OSS and not ALSA drivers. I
g> could be completely off base here. Anyway, kmix shows 3 audio line ins
g> for btaudio, and setting any of them to record produces no sound in
g> MythTV. Ideas?

No, there is no problem using btaudio for sound-in and ALSA
for sound-out. You just need to tell MythTV to use a different
/dev/dspX for sound input when you run "setup/setup" (find the device
number in your syslog, at the point where btaudio is loaded). But
first, have you tested that btaudio is working outside MythTV? Run
"xawtv" and use aplay or sox to read the btaudio device. Read the
kernel docs (Documentation/sound/btaudio) for more information.

--
Gregorio Gervasio, Jr.
gtgj@pacbell.net

Re: Tuners and Audio, was: B&W Picture and Channels off.... [ In reply to ]

unit3 at demoni

Mar 19, 2003, 7:09 PM

Post #5 of 5 (1706 views)

Permalink

Gregorio Gervasio Jr. wrote:

>No, there is no problem using btaudio for sound-in and ALSA
>for sound-out. You just need to tell MythTV to use a different
>/dev/dspX for sound input when you run "setup/setup" (find the device
>number in your syslog, at the point where btaudio is loaded). But
>first, have you tested that btaudio is working outside MythTV? Run
>"xawtv" and use aplay or sox to read the btaudio device. Read the
>kernel docs (Documentation/sound/btaudio) for more information.
>
Heh... I just dug through the archives and saw all the discussion on
this, and I've got it working lovely now with BTAudio, in full stereo at
44.1 kHz. RTFM indeed, I should know better than to ask FAQs. ;)

Thanks!

Graeme