diff options
Diffstat (limited to 'abs/core-testing/local-website/htdocs/mythtv-doc/mythtv-HOWTO-7.html')
| -rw-r--r-- | abs/core-testing/local-website/htdocs/mythtv-doc/mythtv-HOWTO-7.html | 130 |
1 files changed, 0 insertions, 130 deletions
diff --git a/abs/core-testing/local-website/htdocs/mythtv-doc/mythtv-HOWTO-7.html b/abs/core-testing/local-website/htdocs/mythtv-doc/mythtv-HOWTO-7.html deleted file mode 100644 index 97bc763..0000000 --- a/abs/core-testing/local-website/htdocs/mythtv-doc/mythtv-HOWTO-7.html +++ /dev/null @@ -1,130 +0,0 @@ -<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 3.2 Final//EN"> -<HTML> -<HEAD> - <META NAME="GENERATOR" CONTENT="LinuxDoc-Tools 0.9.21"> - <TITLE>Installing and using MythTV: Configuring Sound.</TITLE> - <LINK HREF="mythtv-HOWTO-8.html" REL=next> - <LINK HREF="mythtv-HOWTO-6.html" REL=previous> - <LINK HREF="mythtv-HOWTO.html#toc7" REL=contents> -</HEAD> -<BODY> -<A HREF="mythtv-HOWTO-8.html">Next</A> -<A HREF="mythtv-HOWTO-6.html">Previous</A> -<A HREF="mythtv-HOWTO.html#toc7">Contents</A> -<HR> -<H2><A NAME="s7">7.</A> <A HREF="mythtv-HOWTO.html#toc7">Configuring Sound.</A></H2> - -<P>If your video doesn't appear to be in-sync with your audio and you're -using an analog video capture card and a soundcard to capture audio, it -could be because you are listening to the real-time audio from your video -card rather than after it's been processed and synchronized to the video by -MythTV. Because MythTV is a personal video recorder, "Live TV" isn't really -live - to let you pause live TV, MythTV is actually encoding the video, -saving to disk, and then playing it back. This procedure puts your MythTV -"live" TV about 2 seconds behind real-time, so it's important that you're -not listening to the live audio. However, if you're having an issue where -the audio and video aren't synchronized by small but varying amount, it's -most likely because the sound driver that you're using doesn't have the -DSP_CAP_REALTIME capability. This was the case with ALSA (0.5), but not -with newer versions. See the -<A HREF="mythtv-HOWTO-22.html#Troubleshooting_Audio">Troubleshooting Audio</A> section for more information if you're having -issues with sound. Also, ensure that no other programs are grabbing the -audio output, like <B>arts</B> or <B>esd</B>.</P> -<P>What you need to do is to mute the "line-in" of your sound card and also -set it as the recording source.</P> -<P>There are two ways to do this. Graphically, and from the command line.</P> - -<H2><A NAME="ss7.1">7.1</A> <A HREF="mythtv-HOWTO.html#toc7.1">Graphically setting up the mixer</A> -</H2> - -<H3>Mandriva and Red Hat Linux/Fedora Core</H3> - -<P>Open Kmix by clicking K->Multimedia->Sound->Kmix for Mandriva, or -<PRE> -RedHat Menu>Sound & Video>Volume Control -</PRE> - on Red Hat/Fedora.</P> -<P>Click on Settings->Configure Make sure that "Tick Marks" and "Show -labels" have "X"'s in them. This will make it easier to find the correct -audio source. Click OK.</P> -<P>On the mixer page, look for Line-In on your sound card. You should see -two LED's - a green one at the top, and a red one at the bottom. The green -one at the top is for muting; you want to make sure that the green LED is a -dark green, meaning that it's "off". You also want to click on the red LED -so that it turns bright red, indicating that it's "ON"; this insures that -the Line-in is used as the source. Click OK, and make sure that you save -the settings so that this is your default.</P> - -<H3>Using ALSA.</H3> - -<P>To use ALSA, you'll need to correctly setup your -<CODE>asoundrc</CODE> file. Configuring this file is beyond the scope of this -HOWTO. Once ALSA is working correctly, change the output sound device in -mythfrontend->setup->Audio from <CODE>/dev/dsp</CODE> to <CODE>ALSA:default</CODE>. -This field may be edited to suit your ALSA requirements.</P> - -<H2><A NAME="ss7.2">7.2</A> <A HREF="mythtv-HOWTO.html#toc7.2">Setting the mixer from the command line</A> -</H2> - -<P>If you have installed the alsa-utils package, then the <B>amixer</B> -program can be used to setup the mixer. The "Master" volume setting is only -required on a frontend machine to ensure that the sound channels are unmuted -and configured for outputting sound. The "Line" and "Capture" controls are -required for your sound card to actually capture audio from the external -Line-in if it's connected to an analog frame grabber. Not all sound cards -have a "Capture" control, but if yours does and you don't set it then MythTV -will not capture audio.</P> -<P> -<HR> -<PRE> -Note the spelling in the following commands. -</PRE> -<HR> - -<BLOCKQUOTE><CODE> -<PRE> -$ amixer set Master,0 100%,100% unmute -$ amixer set PCM,0 100%,100% unmute -$ amixer set Line,0 75%,75% mute captur -$ amixer set Capture,0 100%,100% captur -$ su -# alsactl store -# exit -$ -</PRE> -</CODE></BLOCKQUOTE> -</P> -<P>If you have multiple sound cards, then use the <CODE>-c</CODE> parameter to -specify which card to adjust. Note that the first card will be "0", the -second will be "1", etc.</P> -<P>That takes care of setting the volume correctly, and the ALSA startup script -will restore the volume after a reboot. If you find that your sound is -distorted, it's possible that the levels in the above examples are too high -for your particular hardware combination. Try reducing the percentages by -5-10% and checking again. Once you're satisfied, re-run the <CODE>alsactl -store</CODE> command.</P> -<P>You may also use the <B>alsamixer</B> program to set the volume. If you -are using an ALSA version after 1.0.6, use <B>alsamixer -V all</B> First, -start <B>alsamixer</B> from the command line. You should start out on the -"Master" volume control slider. Use the up and down cursor to set the -master volume to around 75%. Next, use the left and right cursor keys to -move around on the screen until you find the "Line" slider. Press SPACE to -set it as the capture source, set the level to around 50-75% and press "M" -to mute it. You can now press ESC to exit out of the <B>alsamixer</B> -program. You can also have MythTV manage all volume and mute settings, but -this will only affect the "Master" or PCM volume, not the capture volume. See -the mythfrontend setup page for options.</P> -<P>Finally, if you've performed all of the above steps, and you still don't seem to have any sound, it's possible that your video capture device is muting the audio output. -<BLOCKQUOTE><CODE> -<PRE> -$ v4lctl -c /dev/video0 setattr mute off -</PRE> -</CODE></BLOCKQUOTE> -</P> - -<HR> -<A HREF="mythtv-HOWTO-8.html">Next</A> -<A HREF="mythtv-HOWTO-6.html">Previous</A> -<A HREF="mythtv-HOWTO.html#toc7">Contents</A> -</BODY> -</HTML> |