mirror of
https://gitee.com/openharmony/third_party_ffmpeg
synced 2024-12-22 19:48:29 +00:00
70 lines
2.1 KiB
Plaintext
70 lines
2.1 KiB
Plaintext
1) Introduction
|
|
---------------
|
|
|
|
ffmpeg is a hyper fast realtime audio/video encoder, a streaming
|
|
server and a generic audio and video file converter.
|
|
|
|
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, Real
|
|
Video(tm), MPEG4, DIVX and MJPEG 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 :-)
|
|
|
|
- optional non real time higher quality encoding (different motion
|
|
estimators available).
|
|
|
|
- Audio and Video decoders are in development.
|
|
|
|
ffmpeg is made of two programs:
|
|
|
|
* ffmpeg: soft VCR which encodes in real time to several formats. It
|
|
can also encode from any supported input file format to any input
|
|
supported format.
|
|
|
|
* ffserver: high performance live broadcast streaming server based on
|
|
the ffmpeg core encoders.
|
|
|
|
2) Documentation
|
|
----------------
|
|
|
|
* Read doc/ffmpeg.txt and doc/ffserver.txt to learn the basic features.
|
|
|
|
* Read doc/TODO to know what are the know bugs and missing features.
|
|
|
|
* Read doc/README.dev if you want to contribute or use the codec or
|
|
format libraries.
|
|
|
|
3) Licensing:
|
|
------------
|
|
|
|
* See the file COPYING. ffmpeg and the associated library EXCEPT
|
|
liba52 are licensed under the Lesser GNU General Public
|
|
License. liba52 is distributed under the GNU General Public License.
|
|
|
|
* This code should be patent free since it is very simple. I took care
|
|
to use the same video encoder/decoder core for all formats to show
|
|
that they really are mostly the same.
|
|
|
|
Fabrice Bellard. |