December 12th, 2023, multi-threaded ffmpeg CLI tool

Thanks to a major refactoring of the ffmpeg command-line tool, all the major components of the transcoding pipeline (demuxers, decoders, filters, encodes, muxers) now run in parallel. This should improve throughput and CPU utilization, decrease latency, and open the way to other exciting new features.

Note that you should not expect significant performance improvements in cases where almost all computational time is spent in a single component (typically video encoding).