Ffmpeg
Only questions about programmatic use of the FFmpeg libraries, API, or tools are on topic
Libav
Libav (or libav*) is the collective name of the FFmpeg libraries: libavcodec, libavformat, libavfilter, libavutil, etc
Others
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Ffmpeg does not yet support hls version 4;as of 2013-07-29 commit c44191039944526dd7eb6e536990b555837961f5 libav ffmpeg have supported version 3 of the protocol from question Which version of FFMPEG supports HLS v4 |
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Not to be confused ffmpeg is more recent and libav was used in some distributions of linux from question FFMPEG RTSP stream to MPEG4/H264 file using libx264 |
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Ubuntu 12.04 ships with the ffmpeg fork libav in version 0.8 which is more compatible with ffmpeg 1.0+ or even later ffmpeg versions iirc from question Avcodec_open segmentation fault |