**This is an old revision of the document!**
Encoding-Quality-Testing
Created with the vmaf-docker repo.
Reference content
Reference content is either our own (https://media.ccc.de) or from Xiph (https://media.xiph.org/video/derf/).
The specific sources are found in https://github.com/voc/vmaf-docker/blob/master/data/sources.json
All the reference content is converted to 8bit 1080p25.
Software
- ffmpeg-4.1.4 (same as in buster)
- libvmaf-1.3.15
- libvpx-1.8.2 (bullseye)
- libx264-2:0.155.2917+git0a84d98-2 (bullseye)
Testing VAAPI vs. software encoding for live streaming
The codec settings are the ones currently in use by the C3VOC for live streaming.
See https://github.com/voc/vmaf-docker/blob/master/data/libquality/profiles/voc_streaming.py for the specific ffmpeg options.
The codecs are tested with bitrates from 1Mbit/s to 5.2Mbit/s.
Graphs
Comments
| Platform | Label | Hardware Codecs | Comments |
|---|---|---|---|
| Intel 6th Gen (i7-6600U) | skylake | h.264, h.265 | h.264 scores better than our VP9 and x264 streaming settings and is pretty fast h.265 even scores a little bit higher but is considerably slower |
| Intel 8th Gen (i7-8665U) | whiskeylake | h.264, h.265, VP9 | h.264 and h.265 results are identical to skylake VP9 scores worse than H.264 and has broken rate-control for <2mbit/s |
| AMD Navi (RX 5700 XT) + Ryzen 2nd Gen (R5-2600) | navi10 | h.264, h.265 | h.264 is worse than x264 on veryfast… h.265 produces 1920×1088 output? |