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[wiki.git] / blog / 2009 / 11

diff --git a/blog/2009/11 b/blog/2009/11
index 85ee3f40f365c2bed21ee4ca05e76b7797fa5d93..112f2c8eb168c419d338a89069a3354c7e29a906 100644 (file)
--- a/blog/2009/11
+++ b/blog/2009/11
@@ -1,4 +1,18 @@
-== Fractal passion ==
+== Thu, Nov 26: The Day of Tofurky ==
+
+{{ pictures/home/acetarium/2009-tofurky2/00122.jpeg | maxwidth=640}}
+{{ pictures/home/acetarium/2009-tofurky/00022.jpg   | maxwidth=640}}
+
+All photos:
+
+ * [[pictures/home/acetarium//2009-tofurky]]
+ * [[pictures/home/acetarium//2009-tofurky2]]
+
+== Wed, Nov 25: Home, sweet home ==
+
+{{http://i33.photobucket.com/albums/d52/mochifish/IMG_1566.jpg}}
+
+== Exploring Julia in 4 dimensions ==
 
 The discovery of the [[http://www.skytopia.com/project/fractal/mandelbulb.html | Mandelbulb]] awekened my old
 passion for fractals.
@@ -11,6 +25,8 @@ So I took the time to re-encode my old rendering of the [[http://en.wikipedia.or
 The sound track is [[http://lite.modarchive.org/index.php?request=view_by_moduleid&query=59288 | UranChrome]],
 an old-skool Amiga SoundTracker module composed by TorbJ0rn in 1989.
 
+=== Downloads ===
+
 If your browser sucks at HTML5, you can directly download the video files, available in several formats:
 
 || **Filename**                                                         || **Resolution**|| **Birate** ||**Video**||**Audio**||**Size**||
@@ -18,3 +34,52 @@ If your browser sucks at HTML5, you can directly download the video files, avail
 || [[pictures/julia4D/julia4D-640x360.ogv | julia4D-640x360.ogv (Ogg)]] ||  640x320 || 1200Kbit/s || Theora || Vorbis   || 13MB ||
 || [[pictures/julia4D/julia4D.avi | julia4D .avi]]                      || 1280x720 || 6000Kbit/s || H.264  || -        || 60MB ||
 || [[pictures/julia4D/julia4D-640x360.avi | julia4D-640x360.avi]]       ||  640x360 || 1200kbit/s || H.264  || -        || 12MB ||
+
+=== Rendering notes ===
+
+It took about 2 weeks of computation on a dual-core machine to render the 2048 high resolution frames contained in 82 seconds of video.
+My previous renderings at lower resolution and lower iteration count were much faster.
+
+A The high iteration count actually makes the fractal surface a little too polverized to appreciate. Adding transparency
+and gradients is another bad idea as it complicates things even more. If I find the time and motivation to re-render the
+animation, I'll look for better balance.
+
+In case someone wants to experiment, these are the [[pictures/julia4D/julia4D.pov | scene source]]
+and [[pictures/julia4D/julia4D.ini | ini file]] I used.
+
+=== Video encoding notes ===
+
+The files were encoded from a sequence of PNG frames generated by POV-Ray,
+using **ffmpeg** and **mencoder**:
+
+{{{
+# hires mpeg4
+please mencoder 'mf://julia4D????.png' -mf fps=25 \
+       -ovc x264 -x264encopts bitrate=6000:pass=1:threads=2 -o julia4D.avi 
+
+# lores mpeg4
+please mencoder 'mf://julia4D????.png' -mf fps=25 -vf scale=640:360 \
+       -ovc x264 -x264encopts bitrate=1200:pass=1:threads=2 -o julia4D-640x360.avi 
+
+# hires theora
+please ffmpeg -f image2 -i julia4D%04d.png \
+       -threads 2 -vb 6000k -vcodec libtheora -acodec libvorbis -f ogg julia4D.ogv \
+       -i UranChrome-fx-short.wav -acodec libvorbis -ab 96k -newaudio
+
+# lores theora
+please ffmpeg -f image2 -i julia4D%04d.png \
+       -threads 2 -s 640x360 -vb 1200k -vcodec libtheora -f ogg julia4D-640x360.ogv \
+       -i UranChrome-fx-short.wav -acodec libvorbis -ab 96k -newaudio
+}}}
+
+This is the software I have used:
+
+{{{
+MEncoder SVN-r29800-4.4.2 (C) 2000-2009 MPlayer Team
+FFmpeg version SVN-r20372, Copyright (c) 2000-2009 Fabrice Bellard, et al.
+libtheora-1.1.0
+libvorbis-1.2.0
+x264-libs-0.26.20091026
+}}}
+
+The quality of the low-res Theora stream is noticeably lower than the corresponding low-res H.264. I don't know why.