libavcodec-dev - 7:4.1.9-0+deb10u1 main

FFmpeg is the leading multimedia framework, able to decode, encode, transcode,
mux, demux, stream, filter and play pretty much anything that humans and
machines have created. It supports the most obscure ancient formats up to the
cutting edge.
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This library provides a generic encoding/decoding framework and
contains multiple decoders and encoders for audio, video and subtitle streams,
and several bitstream filters.
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The shared architecture provides various services ranging from bit stream I/O
to DSP optimizations, and makes it suitable for implementing robust and fast
codecs as well as for experimentation.
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This package contains the development files.