Update README.md

Author: Alex Feyerke

README.md

@@ -1,4 +1,48 @@
 Screenlapse
 ===========
 
-A bash script for os x that makes a timelapse video of your screen with ffmpg
+A bash script for os x that makes a timelapse video of your screen with ffmpg.
+
+What it does
+------------
+
+* Takes incrementally numbered screenshots of your main monitor at a definable interval, and at a definable resolution. 
+* If you have ffmpeg installed, it will let you render these screenshots to a .mov file at an arbitrary framerate.
+
+How to use it
+-------------
+
+* Clone screenlapse.command to wherever you want your screenshots and the video.
+* Make the file executable (via cmd-i or chmod +x screenlapse.command).
+* Double click it. 
+
+If you're in a hurry, just smash the enter key three times to start recording with defaults, otherwise, you can set these parameters:
+* __Interval__: number of seconds between each screenshot. Default is 4.
+* __Starting value for incremental numbering__: if you exited the script before and want to resume now, put the name of the last screenshot +1 here (if your last screenshot was 2214.jpg, enter 2215 here). Default is 1.
+* __Target width__: Whatever you want the width if the resulting images/video to be, i.e "640". Correct aspect ratio is maintained. Defaults to your screen resolution. 
+
+You can then stop the screenshotting with ctrl-c. If ffmpeg is installed, you will then be prompted whether you want to render the screenshots into a -mov file. If yes, you will be prompted for:
+* __Framerate__: Target framerate of the .mov. Default is 12.
+* __Filename__: The name of the .mov file. Default is "timelapse".
+
+Careful: screenlapse will overwrite any existing files without warning. 
+
+Installing ffmpeg:
+-----------------
+
+If you have homebrew installed: ```$ brew install ffmpeg```
+
+Otherwise try: 
+
+    $ svn checkout svn://svn.ffmpeg.org/ffmpeg/trunk ffmpeg
+    $ cd ffmpeg
+    $ ./configure --enable-shared --disable-mmx
+    $ sudo make
+    $ sudo make install
+
+(I could never make this work)
+
+Stuff
+-----
+
+Screenlapse happened because of [this blog post](http://labs.laan.com/wp/2011/01/how-to-make-time-lapse-screencaptures-of-your-design-work-for-free-mac/), so thanks to those two guys.