X-Git-Url: https://git.ao2.it/vidi-player.git/blobdiff_plain/8feb3b634207bd2176c686ce927a6e037460d7f7..33b30fcf192374c2d3032c7b9d94c1c476bb9d54:/README.md

diff --git a/README.md b/README.md
index 4c4180c..360b182 100644
--- a/README.md
+++ b/README.md
@@ -6,21 +6,60 @@ the notes in the MIDI file.
 
 vidi-timeline allows to create more easily videos like these:
 
-* Lasse Gjertsen - Hyperactive -  https://youtu.be/o9698TqtY4A
-* Vittorio Saggiomo - Mario Bros Column Chromatography - https://youtu.be/mxi3z2vDV_0
+* [Lasse Gjertsen - Hyperactive](https://youtu.be/o9698TqtY4A)
+* [Vittorio Saggiomo - Mario Bros Column Chromatography](https://youtu.be/mxi3z2vDV_0)
 
 
-Examples of use
-===============
+How to create a VideoFont
+=========================
 
-vidi-timeline.py
-----------------
+Synthetic VideoFont
+-------------------
 
 Create a synthetinc VideoFont:
 
     $ ./create_test_videofont.py videofont/
 
 
+From a video recording
+----------------------
+
+A VideoFont can also be created by recording a video, and then splitting the
+recording in samples, one sample per note.
+
+For an example of a master VideoFont see
+[keyboard videofont master C4 B5](https://youtu.be/7Btp80LPqRs)
+
+A file like the one above can be analyzed with [Audacity][1] to find the start
+and the  end time of the individual samples:
+
+* use the `Analyze -> Sound Finder...` to find the samples;
+* use the [`Pitch Detect" plugin`][2] to find the pitch of the samples and name
+  them accordingly;
+* maybe add  an interval named "rest" to represent the absence of sound;
+* export the labels track with `File -> Export Labels...`;
+
+[1]: http://www.audacityteam.org/
+[2]: http://wiki.audacityteam.org/wiki/Nyquist_Analyze_Plug-ins#Pitch_Detect
+
+An example of such a file prodiced by audacity can be found in the `contrib/`
+directory and it can be used as follows:
+
+    $ youtube-dl -t https://youtu.be/7Btp80LPqRs
+    $ ./contrib/ges-split-samples.py \
+        "keyboard videofont master C4 B5-7Btp80LPqRs.mp4" \
+        "contrib/keyboard videofont master C4 B5-samples.txt" \
+        videofont/ > split.sh
+    $ mkdir videofont/
+    $ sh split.sh && rm split.sh
+
+
+Examples of use
+===============
+
+vidi-timeline.py
+----------------
+
 Play the timeline from a MIDI file using the samples from the VideoFont:
 
     $ ./vidi-timeline.py examples/Beyer\ Op.\ 101\ -\ Exercise\ 008.midi videofont/
@@ -64,10 +103,10 @@ Midi-Vidi
 
 A similar concept called midi-vidi has been developed by Marcus Fischer:
 
-* http://unrecnow.com/dust/325-midi-vidi-effect-demo/
-* https://vimeo.com/8049917
-* http://www.synthtopia.com/content/2009/12/09/midi-vidi-plugin-lets-you-control-video-via-midi-in-max-for-live/
-* http://www.maxforlive.com/library/device.php?id=120
+* <http://unrecnow.com/dust/325-midi-vidi-effect-demo/>
+* <https://vimeo.com/8049917>
+* <http://www.synthtopia.com/content/2009/12/09/midi-vidi-plugin-lets-you-control-video-via-midi-in-max-for-live/>
+* <http://www.maxforlive.com/library/device.php?id=120>
 
 Midi-Vidi is also a very cool name, it sound like the Italian "mi dividi" which
 means "you divide me".
@@ -77,5 +116,5 @@ VidiBox
 
 An interactive video mashup app:
 
-* http://www.vidibox.net/
-* https://twitter.com/vidibox
+* <http://www.vidibox.net/>
+* <https://twitter.com/vidibox>