Add video encoding post.

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+[[!meta  title="Video encoding for the web"]]
+
+According to [Mark Pilgrim][MP], video embedded in the following
+manner should work for Firefox 3.5+ and Opera 10.5+ (playing the ogg
+movie), Safari, iPhones, and Androids (playing the mp4 movie), and
+Chrome 4+ playing either one.  If you're not running one of those
+browsers, you can download the video an extermal player (like
+[VLC][]).
+
+My digital camera takes movies in
+
+* Container: mov,mp4,m4a,3gp,3g2,mj2
+* Video: mjpeg, yuvj420p, 640x480, 10422 kb/s, 30 tbr, 30 tbn, 30 tbc
+* Audio: pcm_u8, 8000 Hz, 1 channels, s16, 64 kb/s
+
+Encode your movie with something like (tagging flags removed)
+
+    ffmpeg2theora --endtime 120 --optimize movie.mov
+
+    ffmpeg -i movie.mov -t 120 -acodec libfaac -aq 200 -ac 1 -s
+        640x480 -vcodec libx264 -vpre slower -vpre ipod640 -b 800k -bt
+        800k -aspect 640:480 -threads 0 movie.mp4
+
+For `-vpre`, take a look in `/usr/share/ffmpeg/`, which usually
+contains a bunch of pre-configured settings.  The parameters for
+baseling H.264 [should be][H264]:
+
+* H.264 Baseline: `avc1.42E0xx`, where xx is the AVC level
+* Low-Complexity AAC: mp4a.40.2
+
+You should use ffmpeg2theora v0.26 or greater, as v0.25 has
+audio/visual syncing issues.
+
+To embed the movie, include something like:
+
+    <video preloads="none" controls="controls" width="640" height="480">
+      <source src="movie.mp4"
+              type='video/mp4; codecs="avc1.42E01E, mp4a.40.2"' />
+      <source src="movie.ogv"
+              type='video/ogg; codecs="theora,vorbis"' />
+      <p>Your browser does not support the &lt;video&gt; tag, try
+      downloading the video and playing it in an external player.
+      </p>
+      <img width="600" src="../2011.01.20.12.33.54.jpg" />
+    </video>
+    <p>Download as
+     <a href="movie.ogv">Ogg/Theora/Vorbis</a> or
+     <a href="movie.mp4">Mpeg4/H.264(ConstrainedBaselineProfile)/AAC</a>.
+    <p>
+
+[MP]: http://diveintohtml5.org/video.html
+[VLC]: http://www.videolan.org/vlc/
+[H264]: http://wiki.whatwg.org/wiki/Video_type_parameters
+[ipod]: http://rob.opendot.cl/index.php/useful-stuff/ipod-video-guide/