diff --git a/tech/development.wiki b/tech/development.wiki
index ac6b861..9d6c4d0 100644
--- a/tech/development.wiki
+++ b/tech/development.wiki
@@ -6,6 +6,7 @@
 * [[sdl2|SDL2]] - Simple Direct Media Layer (Low level X Windows and graphics)
 * [[libcurl|Libcurl]] - Curl the tool, but the API
 * [[periodictable|Periodic Table]] - Python periodic table
+* [[ffmpeg]] - video/media library
 
 == Tools ==
 
diff --git a/tech/ffmpeg.wiki b/tech/ffmpeg.wiki
index f924109..f32ca39 100644
--- a/tech/ffmpeg.wiki
+++ b/tech/ffmpeg.wiki
@@ -1,6 +1,6 @@
 = FFmpeg =
 
-Command line tool for working with video
+Command line tool for working with video. Also a library
 This is just a collection of common tasks
 
 == Rencode as another video ==
@@ -19,4 +19,24 @@ All timestamps must be of format HH:MM:SS.xxx
 ffmpeg -i in.mp4 -ss 00:00:30.0 -c copy -t 00:00:10.0 out.mp4
   }}}
 
+== Library ==
+
+The C library for ffmpeg has poor documentation.
+
+Movie files consist of several components in the FFMPEG model.
+
+- Container 
+  - The file itself
+  - MKV, AVI, etc
+- Streams 
+  - Several streams in a container
+  - IE audio stream, video stream, subtitle stream, etc
+- Frames 
+  - Elements or samples of a stream
+- Codec 
+  - Define how data is encoded and decoded 
+  - MP3, DivX, x264, etc
+- Packets 
+  - Bits of data in a stream that are decoded into raw frames
+
 [[index]]