[mythtv-users] Line In on Asus M3N78-EM mobo [SOLVED]

[Michael PARKER]

Tracked down the problem to the fact that, in applying a patch for the HVR-4000 RF tuner, I was rebuilding libmythtv-0.23.so.0.23.0 without alsa support (missing alsa-lib-devel package).....

Everything working fine now.

Mike

> -----Original Message-----
> From: Mike Parker [mailto:michael.parker at st.com] 
> Sent: Wednesday, April 28, 2010 1:38 PM
> To: 'Discussion about mythtv'
> Subject: Line In on Asus M3N78-EM mobo
> 
> Hi,
> 
> I'm running Myth 0.23rc2 on Fedora 12 x86_64. Hardware is a 
> Asus M3N78-EM mobo with Hauppauge HVR-4000 capture card. I'm 
> using the onboard sound of the M3N78-EM.
> 
> All is working fine except that I'm having problems recording 
> from the Line In channel. ALSA audio in Myth is working - I 
> can listen to sound from movies - and video is being 
> successfully captured from the HVR-4000 card via the 
> HVR-4000's Component input.
> 
> Audio is provided directly from a cable STB via a dual phono 
> to stereo jack lead plugged into the Line In of the mobo. If 
> I unmute the Line In playback channel in alsamixer, I hear 
> the Line In input from the Line Out output. Consequently, I 
> can watch delayed "live" TV in Myth whilst listening to real 
> time audio straight from Line In.
> 
> I've followed the generic guidance for setting up audio (set 
> Line In volume, mute it, set Line In as Capture source etc.) 
> without success. Looking in the Myth backend log, I see 
> errors regarding "Cannot create audio device ALSA:default", 
> "ALSA:default" coming from the capture card definition in 
> mythtv-setup. 
> 
> No matter what I try in the "Audio input" field of the 
> capture card (ALSA:default, ALSA:analog, 
> ALSA:default:Card=NVidia, ALSA:hw:0,0), I see the same 
> "Cannot create audio device" error in the BE log.
> 
> Interestingly, if I look at the alsamixer Capture channels, I 
> see that I have two Capture channels (Capture & Capture1) 
> each with their own input source (able to select between Line 
> In & CD, IIRC). Setting both input sources as "Line In", I've 
> tried (without success) enabling one or both Capture channels.
> 
> My sound output is configured to just pick-up ALSA:default 
> and that works fine. I had a brief period last night where 
> the HVR-4000's on-card audio output grabbed card index 0 but 
> this behaviour has (apparently) been cured by following the 
> advice here 
> (http://linuxtv.org/wiki/index.php/Hauppauge_WinTV-HVR-4000#So
und_driver).
> 
> Can anyone see any obvious mistakes in any of the above? 
> 
> Should the "ALSA:default" audio input normally suffice for a 
> framegrabber card or do I need to concoct a more exotic, 
> hardware-specific string?
> 
> I'll try and debug further by trying to pick up the Line In 
> input using mplayer, but an initial play last night indicated 
> the following mplayer string to have the same problem (video 
> but no audio):
> 
> mplayer -v tv:// -tv 
> driver=v4l2:device=/dev/video0:chanlist=europe-west:normid=4:a
lsa:adevice=hw.1:immediatemode=0:channel=21
> 
> NB. Following advice I found on the web re. recent Linux 
> distros not needing a /etc/asound.conf or ~/.asoundrc file, 
> I'm currently not running with either file. Is this likely to 
> be problematic given my hardware? If so, has anyone got any 
> advice on what the file contents should be?
> 
> I'm also slightly concerned that PulseAudio may be 
> interfering with ALSA. Myth audio output only worked when I 
> uninstalled the Pulse ALSA plugin, removing the PulseAudio 
> card/device(?) from alsamixer and making, I assume, ALSA the 
> default audio output (the one that appears by default when 
> starting up alsamixer). Apart from the removal of this single 
> plugin, PulseAudio is still installed. The actual pulseaudio 
> package has so many dependencies within Gnome etc. that I 
> don't believe it will be possible to remove it, although some 
> of the other Pulse packages look removable without dire consequences.
> 
> As ever, any help/advice anyone can give would be greatly appreciated.
> 
> Mike
>