[mythtv-users] Just can't lick this sound issue
Douglas Phillipson
dougp at intermind.net
Tue Nov 25 13:47:37 EST 2003
Jonathon.Schmidt at sasktel.sk.ca wrote:
> Ok Doug,
> I am a redhat 9 user as well, and I have had my fair share of audio
> problems with alsa, however I think I have it licked now as I have done the
> install twice. RH9 uses OSS by default, so alsa needed to be installed.
> However, you have to install alsa for your sound driver.
> With your Alsa driver install did you:
>
>
> Start with the alsa-driver package:
>
> # tar -xjf alsa-driver-0.9.x.tar.bz2
> # cd alsa-driver-0.9.x
> # ./configure --with-cards=XXX --with-sequencer=yes
> # make
> # su
> # make install
> # ./snddevices
>
> Do all of these steps for the driver package and put your sound card in the
> XXXX.
> Then:
>
> Next insert the new modules by:
>
>
> # modprobe snd-XXXX; modprobe snd-pcm-oss; modprobe snd-mixer-oss; modprobe
> snd-seq-oss
>
>
> If you are having trouble inserting snd-XXXX you can check the modules
> already inserted by lsmod.
>
>
> If you see your sound driver already in there you must take it out by rmmod
> via82xx
>
>
> Try this
>
>
> Jon
>
Ahh, I didn't do the rmmod step, wouldn't a reboot accomplish the same
thing? Don't remember if I rebooted though. I did compile/install
alsa-driver, alsa-utils,and alsa-lib as you said. Can you sent me your
modules.conf please?
Thanks (Posting order is getting confused...)
Doug P
>
>
>
>
>
> Douglas Phillipson
> <dougp at intermind.net To: Discussion about mythtv <mythtv-users at mythtv.org>
> > cc:
> Sent by: Subject: [mythtv-users] Just can't lick this sound issue
> mythtv-users-bounces
> @mythtv.org
>
>
> 11/25/2003 12:08 AM
> Please respond to
> Discussion about
> mythtv
>
>
>
>
>
>
> Joseph A. Caputo wrote:
>
>>On Monday 24 November 2003 11:02, Douglas Phillipson wrote:
>>
>>
>>>Joseph A. Caputo wrote:
>>>
>>>
>>>>On Monday 24 November 2003 02:46, Douglas Phillipson wrote:
>>>>
>>>>
>>>>>Douglas Phillipson wrote:
>>>>>
>>>>>
>>>>>>Installed MythTV from apt-get install mythtv-suite. Using Redhat
>>>>>>9, NVidia Gforce4, WinTV Go capture card.
>>>>>>
>>>>>>My backend is on the same machine as my frontend. Recording is
>>>>>>taking place. I can see the recordings in lower left of screen
>>>>>>when I'm in "Watch Recordings". When I choose to play a recording
>>>>>>or try watching live TV I get a blank screen. I have "Video
>>>>>>player" set to "mplayer -fs %s".
>>>>>>
>>>>>>Question: What does MythTV use to play live TV and playback
>>>>>>recorded video? Is it Mplayer? What??? My xawtv works fine.
>>>>>>
>>>>>>What am I missing?
>>>>>>
>>>>>>Thanks
>>>>>>
>>>>>>Doug P
>>>>>
>>>>>I discovered I had to install Xine, sorry about that. Now i can
>>>>>playback a recorded video (no sound yet) I hear sound during the
>>>>>recording in the lineout jack of the WinTV Go board though. But I
>>>>>still can't watch Live TV, screen goes black. Any suggestions are
>>>>>appreciated...
>>>
>>>I saw xine, ogle mentioned in a step by step guide
>>>(http://pvrhw.goldfish.org/tiki-page.php?pageName=rh9pvr250) and just
>>>installed it. When I did my playback (video only) started working so
>>>I thought...
>>>That was my problem, I thought... Should my Hauppage 190 be similar
>>>to the PVR250 as far as this install is concerned?
>>
>>
>>No, the WinTV-GO is just a regular V4L (Video4Linux) card with no
>>hardware encoding.
>>
>>
>>
>>
>>>I'm curious, why was an "internal player" used/created instead of one
>>>of the many available? I hope that's not a dumb question.
>>
>>
>>Well, first of all, Myth records in a 'tweaked' NuppelVideo format that
>>isn't natively supported by external players, and second, having an
>>internal format & player allows better control over playback features
>>(bookmarks, commercial skip, etc).
>>
>>
>>
>>
>>>>Whatever gave you the idea you needed to install Xine or mplayer?
>>>>Myth uses its own internal player to play back recorded programs.
>>>>You only need an external player if you want to play back non-Myth
>>>>content using the MythVideo plugin.
>>>>
>>>>The reason you can't watch LiveTV is likely because your sound card
>>>>or driver doesn't support (or isn't configured properly for) full
>>>>duplex.
>>>
>>>Is sound required to see the video?
>>
>>
>>The frontend basically blocks on trying to open the sound device. If it
>>can't open the sound device, it won't start playback, hence a black
>>screen. There are two likely reasons why this might be happening. One
>>reason (and the most common) is that you're running Gnome or KDE and
>>need to disable or kill the sound daemon (esd in Gnome; artsd in KDE);
>>other processes like mythfrontend can't access the sound device for
>>output while another app (esd/artsd) already has it open for output.
>>The other possibility is that your sound card or driver doesn't support
>>full duplex (i.e., simultaneous record & playback). In LiveTV, what's
>>happening is the live feed is being recorded & encoded and then
>>immediately played back. So, if your card isn't doing full duplex,
>>then the frontend can't open the device because the backend already has
>>it open for recording.
>>
>>
>>
>>
>>>>The reason you have no sound when you play back a recording is
>>>>likely because your recordings have no sound (i.e., your sound is
>>>>mis-configured for Myth).
>>>
>>>I'm now hearing sound when I attempt live watching, so I thought I
>>>had sound licked...
>>
>>
>>But is your sound out of sync, as in a couple of seconds ahead of the
>>video?
>>
>>
>>
>>
>>>>Read the section in the docs about troubleshooting audio (http://
>>>>www.mythtv.org/docs/mythtv-HOWTO-7.html and
>>>>http://www.mythtv.org/docs/ mythtv-HOWTO-20.html#ss20.11 & try to
>>>>get your audio configured properly.
>>>>
>>>>-JAC
>>>>
>>>>PS- In future, it would be helpful to submit your system specs when
>>>>asking for help. Include things like: motherboard, CPU, sound
>>>>card, video card, Linux distro, sound drivers, video card, tuner
>>>>card, version of Myth & source of Myth (i.e., RPM, Deb, source
>>>>tarball or CVS)
>>>
>>>OK, Thanks I'll keep plugging away at it and post my resulting
>>>successful procedure. And thankyou VERY much for the support! Are
>>>you the author of any of this great stuff?
>>
>>
>>Sorry, I didn't see your specs at the top of your original post... but
>>you haven't indicated what kind of sound card you have or whether
>>you're using ALSA or OSS. This is important information when
>>troubleshooting audio!
>>
>>-JAC
>
>
> Well I've jacked my sound all up. I have VIA VT82xx audio on mobo.
> Does Redhat 9 use ALSA or OSS by default? Anyway I installed
> alsa-drivers, alsa-lib, alsa-utils from source, no errors. Changed
> /etc/modules.conf according to the alsa site's specs:
>
> # ALSA portion
> alias char-major-116 snd
> alias snd-card-0 snd-via82xx
> # module options should go here
>
> # OSS/Free portion
> alias char-major-14 soundcore
> alias sound-slot-0 snd-card-0
>
> # card #1
> alias sound-service-0-0 snd-mixer-oss
> alias sound-service-0-1 snd-seq-oss
> alias sound-service-0-3 snd-pcm-oss
> alias sound-service-0-8 snd-seq-oss
> alias sound-service-0-12 snd-pcm-oss
>
> then did "modprobe snd-via82xx" and get: Initmodule: no such device.
>
>
> If RH 9 already used alsa should I have even installed alsa?
>
> Confused but thankful for you experts...
>
> Doug P
>
>
>
>
>
>
>
>
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--
Douglas Phillipson
Internet Consultant
702-295-8872
dougp at intermind.net
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