##introduction
This benchmark evaluates the different presets options offered by x264, using medium as reference, and providing size and time
differences (relative and not).
##benchmark
Tests run with latest x264 (12139) and FFmpeg, configured to run with threading enabled. The slower and veryslow presets have
been modified to keep the number of refs constant and compatible with most decoders. All results represent an average over 10 runs
computed by perf.