Hi tech@
Based on the thread [http://marc.info/?t=146015363500001] now following
up with a much improved diff by valuable patient guidance and very fine
feedback from ratchov@ tj@ tb@ that got accepted in as FAQ section 13.5
Learned a lot from the iterative process, thank you all & best regards,
Anton
$ diff -u faq13.html-{1.178,1.179}
--- faq13.html-1.178 Tue Apr 12 06:35:57 2016
+++ faq13.html-1.179 Wed Apr 13 21:39:35 2016
@@ -52,19 +52,21 @@
<li><a href="#playaudio" >13.2 - Playing different kinds of audio</a>
<li><a href="#playCD" >13.3 - How can I play audio CDs in OpenBSD?</a>
<li><a href="#recordaudio">13.4 - Can I use OpenBSD to record audio
samples?</a>
-<li><a href="#audioserver">13.5 - How do I set up an audio server?</a>
-<li><a href="#audioprob" >13.6 - What can I do if I have audio problems?</a>
-<li><a href="#midi" >13.7 - How do I use my MIDI instruments?</a>
-<li><a href="#playDVD" >13.8 - How can I playback video DVDs in OpenBSD?</a>
-<li><a href="#burnCD" >13.9 - How do I burn CDs and DVDs?</a>
+<li><a href="#recordmon" >13.5 - Recording a monitor mix of all audio
+ playback</a>
+<li><a href="#audioserver">13.6 - How do I set up an audio server?</a>
+<li><a href="#audioprob" >13.7 - What can I do if I have audio problems?</a>
+<li><a href="#midi" >13.8 - How do I use my MIDI instruments?</a>
+<li><a href="#playDVD" >13.9 - How can I playback video DVDs in OpenBSD?</a>
+<li><a href="#burnCD" >13.10 - How do I burn CDs and DVDs?</a>
<ul>
- <li><a href="#burnIntro">13.9.1 - Introduction and basic setup</a>
- <li><a href="#writeCD" >13.9.2 - Writing CDs</a>
- <li><a href="#writeDVD" >13.9.3 - Writing DVDs</a>
+ <li><a href="#burnIntro">13.10.1 - Introduction and basic setup</a>
+ <li><a href="#writeCD" >13.10.2 - Writing CDs</a>
+ <li><a href="#writeDVD" >13.10.3 - Writing DVDs</a>
</ul>
-<li><a href="#javaplugin" >13.10 - Can I have Java support in my web browser?
+<li><a href="#javaplugin" >13.11 - Can I have Java support in my web browser?
(amd64 only)</a>
-<li><a href="#flashplugin">13.11 - Can I have Flash support in my web
+<li><a href="#flashplugin">13.12 - Can I have Flash support in my web
browser?</a>
</ul>
<hr>
@@ -268,8 +270,31 @@
silent on some systems.
However, pre-amplifying can also be quite loud on other systems.
-<h2 id="audioserver">13.5 - How do I set up an audio server?</h2>
+<h2 id="recordmon">13.5 - Recording a monitor mix of all audio playback</h2>
+A monitoring stream records combined audio output from all playback devices,
+allowing you to duplicate or save anything going through the audio subsystem.
+This feature can be useful for screencasts or any kind of live audio mixing.
+
+<p>
+Create the monitor sub-device <tt>mon</tt> for
+<a href="http://man.openbsd.org/?query=sndiod";>sndiod(8)</a> by using:
+
+<blockquote><pre>
+# <b>rcctl set sndiod flags -s default -m play,mon -s mon</b>
+# <b>rcctl restart sndiod</b>
+</pre></blockquote>
+
+Configure your program to record audio from the <tt>snd/0.mon</tt> device:
+
+<blockquote><pre>
+$ <b>aucat -f snd/0.mon -o file.wav</b>
+</pre></blockquote>
+
+At this point, whatever your system plays is recorded in <tt>file.wav</tt>.
+
+<h2 id="audioserver">13.6 - How do I set up an audio server?</h2>
+
<!-- This section Copyright (c) 2009 Alexandre Ratchov -->
<h3>What latency do I need?</h3>
@@ -372,7 +397,7 @@
With the default configuration, sndiod will consume around 200kB/s of
network bandwidth.
-<h2 id="audioprob">13.6 - What can I do if I have audio problems?</h2>
+<h2 id="audioprob">13.7 - What can I do if I have audio problems?</h2>
If you do not hear anything when playing audio, it's possible there
is a mixer control turned to low or simply muted.
@@ -429,7 +454,7 @@
of <tt>mixerctl -v</tt> and the output of the above test for DAC
processing.
-<h2 id="midi">13.7 - How do I use my MIDI instruments?</h2>
+<h2 id="midi">13.8 - How do I use my MIDI instruments?</h2>
The Musical Instrument Digital Interface (MIDI) protocol provides a
standardized and efficient means to represent musical performance
@@ -536,7 +561,7 @@
transforming MIDI data can be achieved using the <tt>rmidish</tt>
utility bundled in the <tt>audio/midish</tt> port.
-<h2 id="playDVD">13.8 - How can I playback video DVDs in OpenBSD?</h2>
+<h2 id="playDVD">13.9 - How can I playback video DVDs in OpenBSD?</h2>
OpenBSD supports DVD media through the ISO 9660 filesystem, which
is also used on CD-ROMs, and also through the
@@ -573,9 +598,9 @@
This should not be much of a problem when playing DVDs on a computer.
</ul>
-<h2 id="burnCD">13.9 - How do I burn CDs and DVDs?</h2>
+<h2 id="burnCD">13.10 - How do I burn CDs and DVDs?</h2>
-<h3 id="burnIntro">13.9.1 - Introduction and basic setup</h3>
+<h3 id="burnIntro">13.10.1 - Introduction and basic setup</h3>
You should first make sure your CD/DVD writer has been recognized and
configured by the kernel.
@@ -651,7 +676,7 @@
<li>Not every DVD writer supports every DVD format, see below.
</ul>
-<h3 id="writeCD">13.9.2 - Writing CDs</h3>
+<h3 id="writeCD">13.10.2 - Writing CDs</h3>
<h4>Creating data CD-ROMs</h4>
@@ -762,7 +787,7 @@
</pre></blockquote>
</ol>
-<h3 id="writeDVD">13.9.3 - Writing DVDs</h3>
+<h3 id="writeDVD">13.10.3 - Writing DVDs</h3>
There are a few important things about DVD you should know about before
proceeding to write your own DVDs.
@@ -958,7 +983,7 @@
The DVD writer falls back to a lower pace than the maximum to reduce the
risk of buffer underruns.
-<h2 id="javaplugin">13.10 - Can I have Java support in my web browser?
+<h2 id="javaplugin">13.11 - Can I have Java support in my web browser?
(amd64 only)</h2>
Just install the <tt>icedtea-web</tt> package.
@@ -971,7 +996,7 @@
browsers disable Java support by default.
You will be prompted for your explicit consent to run applets via icedtea-web.
-<h2 id="flashplugin">13.11 - Can I have Flash support in my web browser?</h2>
+<h2 id="flashplugin">13.12 - Can I have Flash support in my web browser?</h2>
The Flash plugin is distributed by Adobe in binary form only.
Adobe does not provide a native OpenBSD plugin.
@@ -980,9 +1005,11 @@
<p>
If you are just looking to watch Flash videos from common websites,
there are a number of options in packages, including
-<a href="https://github.com/monsieurvideo/get-flash-videos";>
-get-flash-videos</a>, <a href="http://flavio.tordini.org/minitube";>minitube</a>
-and <a href="http://rg3.github.com/youtube-dl/";>youtube-dl</a>.
+<a
href="https://github.com/monsieurvideo/get-flash-videos";>get-flash-videos</a>,
+<a href="http://flavio.tordini.org/minitube";>minitube</a>,
+<a href="http://docs.livestreamer.io/";>livestreamer</a>,
+and
+<a href="http://rg3.github.com/youtube-dl/";>youtube-dl</a>.
<p>
<hr>
$ diff -u index.html-{1.448,1.449}
--- index.html-1.448 Tue Apr 12 08:08:59 2016
+++ index.html-1.449 Wed Apr 13 21:39:43 2016
@@ -264,19 +264,21 @@
OpenBSD?</a>
<li><a href="faq13.html#recordaudio">13.4 - Can I use OpenBSD to record
audio samples?</a>
-<li><a href="faq13.html#audioserver">13.5 - How do I set up an audio
+<li><a href="faq13.html#recordmon" >13.5 - Recording a monitor mix of all
+ audio playback</a>
+<li><a href="faq13.html#audioserver">13.6 - How do I set up an audio
server?</a>
-<li><a href="faq13.html#audioprob" >13.6 - What can I do if I have audio
+<li><a href="faq13.html#audioprob" >13.7 - What can I do if I have audio
problems?</a>
-<li><a href="faq13.html#midi" >13.7 - How do I use my MIDI
+<li><a href="faq13.html#midi" >13.8 - How do I use my MIDI
instruments?</a>
-<li><a href="faq13.html#playDVD" >13.8 - How can I playback video
+<li><a href="faq13.html#playDVD" >13.9 - How can I playback video
DVDs in OpenBSD?</a>
-<li><a href="faq13.html#burnCD" >13.9 - How do I burn CDs and
+<li><a href="faq13.html#burnCD" >13.10 - How do I burn CDs and
DVDs?</a>
-<li><a href="faq13.html#javaplugin" >13.10 - Can I have Java support in
+<li><a href="faq13.html#javaplugin" >13.11 - Can I have Java support in
my web browser? (amd64 only)</a>
-<li><a href="faq13.html#flashplugin">13.11 - Can I have Flash support in
+<li><a href="faq13.html#flashplugin">13.12 - Can I have Flash support in
my web browser?</a>
</ul>
@@ -359,7 +361,7 @@
<p>
<small>
<em>OpenBSD FAQ Copyright © 1998-2016 OpenBSD</em><br>
-$OpenBSD: index.html,v 1.448 2016/03/30 22:07:41 tb Exp $
+$OpenBSD: index.html,v 1.449 2016/04/13 16:38:18 tj Exp $
<br>
<!-- "If you don't find it in the index, look very carefully through the
entire catalogue."<br>
