To improve encoding capability, the challenge is to increase compression efficiency while preserving the original video quality. We achieved up to 20% improved efficiency by adding long-term reference and increasing I-frame quality for low motion content. Media SDK introduces the Adaptive Long Term Reference (LTR) in the 2018R1 Windows release, an intelligent encoding feature which significantly improves compression efficiency and video quality for video conferences, surveillance and certain graphics/game streaming applications. Intel® Media SDK has been working hard on improving this capability based on our hardware.
Up next will be H.264 with the FFmpeg slow presets.In media application, one important feature of the encoder is to lower the bitrate while keeping the high video quality. Now the results in CRF value groups: h264 fasts crf 20 h264 fasts crf 21 h264 fasts crf 22 h264 fasts crf 23 h264 fasts crf 24 h264 fasts crf 25 h264 fasts crf 26 h264 fasts crf 27 h264 fasts crf 28 h264 fasts crf 29 h264 fasts crf 30 Sorting by encoding FPS Sorting by fps when encoding Sorting by bitrate Sorting by bitrate Sorting by end file size Sorting by end file size Sorting by encoding time in seconds Sorting by time taken to encode Here are all the fast presets with encoding FPS, speed, bitrate and end file size compared to the source media.Įach preset individually through the CRF spectrum: ultrafast H.264 ultrafast preset superfast H.264 superfast preset veryfast H.264 veryfast preset faster H.264 faster preset fast H.264 fast preset This is especially relevant for when I do the HEVC H.265 testing with a 400Mbps 10 bit 4k video file. This file was chosen because of its size, a large resolution with a very beefy bitrate. At 4k resolution (3840×2160) 29.97 fps, 30 seconds long, 250Mbps bitrate and a file size of 895MB. 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.
Ultrafast, superfast, veryfast, faster and fast with CRF values 20 through to 30. Starting with this post which is the fast presets for H.264. The posts will be split up with a finale putting the fasts and slows presets from both H.264 with HEVC. 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.
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