libavcodec, for encoding and decoding of audio, video and subtitle bitstreams.The ffmpeg tool is, like you said, a command line wrapper for a number of libraries designed for handling multimedia content. Current Ubuntu uses the "real" ffmpeg again. Some distributions decided to ship Libav instead of FFmpeg programs for some time, notably Ubuntu, which caused a bit of confusion in the transition period where the Libav command was still named ffmpeg. Libav was fork of the FFmpeg project, which supplied the avconv binary.ffmpeg is one of the tools they offer (others are ffplay and qt-faststart, for example).FFmpeg is a software project with lots of people involved, a Wiki, a bug tracker, some funding, etc.
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