FFmpeg README

FFmpeg is a collection of libraries and tools to process multimedia content such as audio, video, subtitles and related metadata.

Extensions by NodeMedia

FLV support vp8 id=10
FLV support vp9 id=11
FLV support opus id=13

Build from source

./configure --enable-small --disable-doc --enable-libsrt --enable-libfreetype \
  --enable-libspeex --enable-libx264 --enable-libx265 --enable-libvpx --enable-libopus \
  --enable-openssl --enable-gpl --enable-nonfree --enable-version3

Examples of encoding parameters in action

The following shows CPU utilization at 25 fps for various frame sizes on a quad-core i5 3.6Ghz desktop running Linux:

Target Resolution	FFmpeg VP9 Parameters	CPU / Speed (example)
3840x2160 (2160p)	-r 30 -g 90 -s 3840x2160 -quality realtime -speed 5 -threads 16 -row-mt 1 -tile-columns 3 -frame-parallel 1 -qmin 4 -qmax 48 -b:v 7800k	~88% 0.39x
2560x1440 (1440p)	-r 30 -g 90 -s 2560x1440 -quality realtime -speed 5 -threads 16 -row-mt 1 -tile-columns 3 -frame-parallel 1 -qmin 4 -qmax 48 -b:v 6000k	~86% 0.68x
1920x1080 (1080p)	-r 30 -g 90 -s 1920x1080 -quality realtime -speed 5 -threads 8 -row-mt 1 -tile-columns 2 -frame-parallel 1 -qmin 4 -qmax 48 -b:v 4500k	~82% 1.04x
1280x720 (720p)	-r 30 -g 90 -s 1280x720 -quality realtime -speed 5 -threads 8 -row-mt 1 -tile-columns 2 -frame-parallel 1 -qmin 4 -qmax 48 -b:v 3000k	~78% 1.77x
854x480 (480p)	-r 30 -g 90 -s 854x480 -quality realtime -speed 6 -threads 4 -row-mt 1 -tile-columns 1 -frame-parallel 1 -qmin 4 -qmax 48 -b:v 1800k	~64% 3.51x
640x360 (360p)	-r 30 -g 90 -s 640x360 -quality realtime -speed 7 -threads 4 -row-mt 1 -tile-columns 1 -frame-parallel 0 -qmin 4 -qmax 48 -b:v 730k	~62% 5.27x
426x240 (240p)	-r 30 -g 90 -s 426x240 -quality realtime -speed 8 -threads 2 -row-mt 1 -tile-columns 0 -frame-parallel 0 -qmin 4 -qmax 48 -b:v 365k	~66% 8.27x

An example FFmpeg might look like this:

ffmpeg -re -i /home/id3as/Videos/demo.mp4 \
  -r 30 -g 90 -s 1280x720 -quality realtime -speed 5 -threads 8 -row-mt 1 \
  -tile-columns 2 -frame-parallel 1 -qmin 4 -qmax 48 -b:v 3000k -c:v vp9 \
  -b:a 128k -c:a libopus -f flv rtmp://192.168.0.2/live/demo

Reference:Live encoding with VP9 using FFmpeg

Libraries

libavcodec provides implementation of a wider range of codecs.
libavformat implements streaming protocols, container formats and basic I/O access.
libavutil includes hashers, decompressors and miscellaneous utility functions.
libavfilter provides means to alter decoded audio and video through a directed graph of connected filters.
libavdevice provides an abstraction to access capture and playback devices.
libswresample implements audio mixing and resampling routines.
libswscale implements color conversion and scaling routines.

Tools

ffmpeg is a command line toolbox to manipulate, convert and stream multimedia content.
ffplay is a minimalistic multimedia player.
ffprobe is a simple analysis tool to inspect multimedia content.
Additional small tools such as aviocat, ismindex and qt-faststart.

Documentation

The offline documentation is available in the doc/ directory.

The online documentation is available in the main website and in the wiki.

Examples

Coding examples are available in the doc/examples directory.

License

FFmpeg codebase is mainly LGPL-licensed with optional components licensed under GPL. Please refer to the LICENSE file for detailed information.

Contributing

Patches should be submitted to the ffmpeg-devel mailing list using git format-patch or git send-email. Github pull requests should be avoided because they are not part of our review process and will be ignored.

NodeMedia/ffmpeg