Thanks to the source media file for the H.264 testing was this file here.

The Xeon E-2246G is a very recently released CPU (Q2 2019).

Total amount of Swap : 1951 MB (0 MB Used) Total amount of Mem : 32068 MB (365 MB Used) Total size of Disk : 877.5 GB (25.1 GB Used) CPU model : Intel(R) Xeon(R) E-2246G CPU 3.60GHz The serverĪn Intel Xeon E-2246G CPU 6 cores, 12 threads at 3.60GHz boosted to 4.80GHz with 32GB of ram and SSD disk running Ubuntu 18.04. This post is part 4 ( part 1, 2, 3) which is the totals, averages and summary for all the presets for H.264 with CRF values 20 through to 30. The posts will be split up with a finale putting the fasts and slows presets from both H.264 with HEVC together. To the human eye this didn’t really make a difference between having the 720p source in full-screen or the 1080p fullscreen.This comprehensive FFmpeg encoding comparison includes H.264 and H.265 HEVC from the fastest preset ultrafast through to veryslow with CRF values from 20 to 30. Upscalingĥ,000 kbps will be okay at 1080p not so much 1440p but i still ran the FFmpeg upscale on the 720p source file: If you want a quick encode just to knock some size out of the file: Fast 23. If you have time up your sleeve and want a good solid compress: Veryslow 21. If you want to reduce the file size but keep good quality and not have it take forever: Slow 22. The faster presets also seemed to add size onto the input file aswell as more bitrate. But the finding for ultrafast seem defunct. The ultrafast preset seemed to play up for me, not sure if it was the small input file being the culprit. In general a slower encode means smaller file size and quicker means little compress. The aim was to test out which of the encoding presets and crf factor gave the smaller file to time ratio. 111 MB file size at a bitrate of 5,002 kbps. Test computer: Ry8 cores 16 threads 3.7 GHz.

I decided to do some testing with FFmpeg in seeing the time, filesize and bitrate differences when choosing different presets and crf plus some upscaling.

Ffmpeg crf meaning