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PostPosted: Tue Jan 27, 2004 11:49 pm 
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Joined: Tue Jan 27, 2004 11:35 pm
Posts: 3
The TEA6300 module source is available in bttv 0.7.107 (in a /old directory) as downloaded from bytesex.org, but apparently this driver is not included in the KnoppMyth distro. From what I can tell, this is necessary to get audio working on the STB TV PCI (Gateway model).

As a relative Linux newbie, what would be the steps to getting this support built on my system?

It may or may not be important for this task, but I am also planning on using a WinTV Stereo card as well (I have it working fine on its own). I actually need both tuners thanks to Comcast in Dallas where I have two separate analog cable feeds (A and B)....don't ask.

Unrelated question: my Pioneer 106S IDE DVD drive works great for audio CDs and DIVX/XVID, but completely crashes the system while playing VCDs and a DVDs. ctl-alt-F1 gives me a never ending stream of I/O errors for ascending sectors on the drive...

Thanks for any help with this - it's been an adventure so far.
Joel

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PostPosted: Wed Jan 28, 2004 5:14 pm 
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Joined: Fri Sep 19, 2003 7:05 pm
Posts: 5088
Location: Fontana, Ca
myfly325 wrote:
As a relative Linux newbie, what would be the steps to getting this support built on my system?
Is there a README or Install in that direcotry? That would be that place to look for exact instructions. Usually patchs from bytesex can be install with.
make KDIR=/path/to/kernel/source
make install
myfly325 wrote:
Unrelated question: my Pioneer 106S IDE DVD drive works great for audio CDs and DIVX/XVID, but completely crashes the system while playing VCDs and a DVDs. ctl-alt-F1 gives me a never ending stream of I/O errors for ascending sectors on the drive...

Thanks for any help with this - it's been an adventure so far.
Joel

Can you play the VCDs and DVDs in another drive w/o issue?

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PostPosted: Wed Jan 28, 2004 8:42 pm 
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Joined: Tue Jan 27, 2004 11:35 pm
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Cesman, thanks for the reply,

As it turns out, the first issue appears to not be a driver issue (good). I still have the audio problem, however. By running:

mplayer -tv on:volume=50000....(other tv tuner options)...

I get good audio (maximum volume of 65535 produces the familiar distortion). The volume setting here is the key. I believe this is a V4L volume setting for the TV card audio output, not a function of the sound card. Through experimentation while mplayer is running, I know it's unrelated to any alsamixer/aumix settings on the system. Of course, MythTV appears to turn this volume all the way up during LiveTV output, and I don't know where to modify that setting. Any help here is appreciated.

My DVD problem is now fixed: I did an apt-get install and everything is good...seems very odd that the encryption problem actually looked like hardware errors.

VCD is also fixed: MythTV was setup to use Xine (I may have inadvertently changed this), which wasn't on my box. I changed it to use mplayer and playback is flawless.

Thanks.

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PostPosted: Thu Jan 29, 2004 9:54 am 
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Location: Fontana, Ca
Does your tv tuner's audio output connect to your soundcard's audio input? Do you have the input set to record?

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PostPosted: Thu Jan 29, 2004 11:03 pm 
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myfly325 wrote:
Of course, MythTV appears to turn this volume all the way up during LiveTV output, and I don't know where to modify that setting.

Is this a typo? Did you mean turn up or down all the way? I only ask because I get no sound from the same Gateway Tuner card.

I'm almost certain this card's analog audio output is useless, the connector is there but nothing comes from it. This card uses internal audio over the PCI bus. I haven't gotten mine to work yet (ATI Wonder works great tho; after setting tuner type=2, KnoppMyth rules). This is the link where I got that info from: http://home.t-online.de/home/gunther.ma ... llery.html

I didn't try your Mplayer volume setting yet, but doesn't this only affect Mplayer, which isn't used during LiveTV or playback of .NUV files?

BTW, I'm using a Sound Blaster Live Value card, on a K7S5A board (haven't gotten the onboard audio to work yet, SIS 7012).

Mplayer DVD playback is outstanding; I just need to find a good VGA to 480P (51" TV) converter so I can quit using the Nvidia GF4MX Svideo.

Thanks in advance.[url][/url]


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 Post subject: More on the STB...
PostPosted: Fri Jan 30, 2004 12:11 pm 
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The STB TV tuner card's audio output is an internal 4-pin header (just like CD audio), connected to my ASUS P4PE's internal "CD audio" input.

When using the mplayer tv volume setting, it is setting the volume for the OUTPUT of the TV tuner card (I have verified this by running mplayer -tv while playing with alsamixer settings - alsasettings do not affect the distortion, and different values entered on the mplayer command line do not affect alsamixer values).

The sound path is as follows:

TV TUNER (internal volume control) --analog cable--> ASUS sound (alsamixer) --analog output to speakers-->

As I've learned, alsamixer settings are easy enough to work with, it's the internal volume setting of the TV tuner output that Mythtv is messing up for me. In fact, I believe I've found this setting in code:

/libs/libmythtv/NuppelVideoRecorder.cpp

line 883 of the version from knoppmyth r4_src:

va.volume = 65535

At this point, I'm trying to recompile this beast with a different value there, more like 45000 (which works well in mplayer), but am having a heck of a time with it.

Is there a shortcut to compiling just this file and getting it back into a running mythTV system, or is an entire rebuild necessary? I ask this because I seem to break all kinds of stuff every time I try ;)

any more help is appreciated

CPUMelting: I don't believe the STB will do audio over the PCI bus (BTaudio)...it doesn't have the right audio chipset. The chipset it has does allow the output volume to be set (as shown by using mplayer, and probably v4lctl /dev/video0 volume 45000, which I haven't tried but will soon) Your problem is more likely a mixer setting.

Assumine your sound card is dsp0, and the input you have your STB connected to is not turned all the way down, try bringing up a xawtv window and tuning a channel, then use:

sox -w -t ossdsp /dev/dsp0 -t ossdsp /dev/dsp0

This gives me audio from the STB...of course, it's very, very distorted.

Maybe that helps, and I can get some more help ;)

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