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The operating system was Ubuntu 18.04 and the FFMpeg version was 3.4.8-0ubuntu0.2.

Thanks to exception0x876 at wishosting for the opportunity to use this. The server used for testing had dual Intel Xeon E5-2687W v4 CPU’s set 3.50GHz, meaning 24 cores and 48 threads in total. The testing is using the constant quality option (crf) and the differences with different deadlines along with the cpu used parameter, these effect speed and the outcome quality. To see the encoding options for VP9 WebM with FFmpeg see my post here. Part 3 was h264 with -deadline good compared to -deadline realtime. In this part 6 see FFmpeg comparison for encoding speed, fps, size and bitrate from an h265 (hevc) MP4 video file to VP9 WebM with both -deadline realtime and -deadline good with -crf values 15-30 and -cpu-used 0-5.