Only enable SSE/3DNOW optimizations when they have been enabled at compilation.

[ffmpeg] / README

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-FFmpeg version 0.9 - (c) 2000 Gerard Lantau.
+FFmpeg README
+-------------
 
-1) Introduction
----------------
-
-ffmpeg is a hyper fast realtime audio/video encoder and streaming
-server. It can grab from a standard Video4Linux video source and
-convert it into several file formats based on DCT/motion compensation
-encoding. Sound is compressed in MPEG audio layer 2 or using an AC3
-compatible stream.
-
-What makes ffmpeg interesting ?
-
-- Innovative streaming technology : multiformat, real time encoding,
-  simple configuration.
-
-- Simple and efficient video encoder: outputs MPEG1, H263 and Real
-  Video(tm) compatible bitstreams using the same encoder core.
-
-- Real time encoding (25 fps in 352x288 on a K6 500) using the video4linux API.
-
-- Generates I and P frames, which means it is far better than a MJPEG
-  encoder.
-
-- Hyper fast MPEG audio layer 2 compression (50 times faster than
-  realtime on a K6 500).
-
-- Hyper fast AC3 compatible encoder.
-
-- simple and very small portable C source code, easy to understand and
-  to modify. It be may the smallest decent MPEG encoder :-)
-
-ffmpeg is made of two programs:
-
-* ffmpeg: soft VCR which encodes in real time to several formats.
-
-* ffserver: live broadcast streaming server based on the ffmpeg core
-encoders.
-
-2) Documentation
+1) Documentation
 ----------------
 
-read doc/ffmpeg.txt and doc/ffserver.txt to learn the basic features.
+* Read the documentation in the doc/ directory.
 
-read ffmpeg
-
-3) Licensing:
+2) Licensing
 ------------
 
-* See the file COPYING. ffmpeg is licensed under the GNU General
+* Read the file COPYING.LGPL. FFmpeg and the associated libraries EXCEPT
+  for libpostproc and libswscale are licensed under the GNU Lesser General
   Public License.
 
-* Source code from third parties: The DCT code comes from the Berkeley
-  MPEG decoder and the JPEG encoder. 
+* libpostproc and libswscale are distributed under the GNU General Public
+  License, see the file COPYING.GPL for details. Their compilation and use
+  in FFmpeg is optional.
+
+* The file libavcodec/x86/idct_mmx.c is distributed under the GNU General
+  Public License. It is strictly an optimization and its use is optional.
+
+* The file libavcodec/ac3dec.c is distributed under the GNU General Public
+  License.  In order for (E-)AC-3 decoding to work you need to enable GPL
+  components.
+
+* The file libavdevice/x11grab.c is distributed under the GNU General
+  Public License. X11 grabbing is optional.
 
-* This code should be patent free since it is very simple. I took care
-  to use the same video encoder core for all formats to show that they
-  really ARE THE SAME except for the encoding huffman codes.
+* The files libavcodec/jfdctfst.c, libavcodec/jfdctint.c, libavcodec/jrevdct.c
+  are taken from libjpeg, see the top of the files for licensing details.
 
-Gerard Lantau (glantau@users.sourceforge.net).
+* The file libavcodec/fdctref.c is copyrighted by the MPEG Software Simulation
+  Group with all rights reserved. It is only used to create a DCT test program
+  and not compiled into libavcodec.