experiment:encoding-quality

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experiment:encoding-quality [2020/06/13 14:34] – [Table] ischluffexperiment:encoding-quality [2026/07/26 22:17] (current) – external edit 127.0.0.1
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-====== Encoding-Quality-Testing ====== +###### Encoding-Quality-Testing 
-Created with the [[https://bitbucket.fem.tu-ilmenau.de/projects/BROADCAST/repos/vmaf-docker/browse|vmaf-docker]] repo.+Created with the [[https://github.com/voc/voctoquality|voctoquality]] repo.
  
-===== Reference content =====+##### Reference content
 Reference content is either our own (https://media.ccc.de) or from Xiph (https://media.xiph.org/video/derf/). 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+The specific sources are found in https://github.com/voc/voctoquality/blob/master/data/sources.json
  
 All the reference content is converted to 8bit 1080p25. All the reference content is converted to 8bit 1080p25.
  
-===== Software =====+##### Software
   * ffmpeg-4.1.4 (same as in buster)   * ffmpeg-4.1.4 (same as in buster)
   * libvmaf-1.3.15   * libvmaf-1.3.15
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   * libx264-2:0.155.2917+git0a84d98-2 (bullseye)   * libx264-2:0.155.2917+git0a84d98-2 (bullseye)
  
-===== Testing VAAPI vs. software encoding for live streaming =====+##### Testing VAAPI vs. software encoding for live streaming
 The codec settings are the ones currently in use by the C3VOC 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.+See https://github.com/voc/voctoquality/blob/master/data/profiles/voc_streaming.py for the specific ffmpeg options.
  
 The codecs are tested with bitrates from 1Mbit/s to 5.2Mbit/s. The codecs are tested with bitrates from 1Mbit/s to 5.2Mbit/s.
  
-==== Graphs ==== +#### Graphs 
-{{ :experiment:vaapi_rates.pdf |}} +{{ :experiment:streaming_rates.pdf |}} 
-{{ :experiment:vaapi_streaming.pdf |}} +{{ :experiment:streaming_refs.pdf |}} 
-{{ :experiment:vaapi_speeds.pdf |}}+{{ :experiment:streaming_speeds.pdf |}}
  
 +#### Comments
  
-==== Comments ==== +^ Platform                                         ^ Label        ^ Hardware Codecs    ^ Comments                                                                                                                                                        ^ 
-{{tablelayout?colwidth="256px"}} +^ 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              | 
-^ Platform                                         ^ Label        ^ Hardware Codecs    ^ Comments                                                                                                                                            ^ +^ Intel 8th Gen (i7-8665U)                         | whiskeylake  | h.264, h.265, VP9  | h.264 and h.265 results worse but faster than skylake, have to check whats up with that\\ VP9 scores worse than H.264 and has broken rate-control for <2mbit/s  | 
-^ 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  | +^ 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 1920x1088 output?                                                                                      | 
-^ Intel 8th Gen (i7-8665U)                         | whiskeylake  | h.264, h.265, VP9  | h.264 and h.265 results are identical to skylake                                                                                                    | +^ Nvidia Turing (RTX2080 Super)                    | turing       | h.264, h.265       | nvidia-driver-460, cuda-toolkit 9.1.85\\ best h.265 encode, h.264 behind Intel                                                                                  | 
-^ 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 1920x1088 output?                                                                          |+ 
 + 
 +#### Finding a Tracker VP9 Profile 
 +### HD-Profile 
 + 
 +Goals:  
 +  * improve quality over previous libvpx (VP8) profile 
 +  * don't increase encoding time too much 
 +  * smaller size but similar quality as x264 master 
 + 
 + 
 +Notes: 
 +  * realtime + speed <= 3: slower and worse than quality good 
 + 
 +``` 
 +-i $ref 
 +-c:v libvpx-vp9 
 +-quality:v good 
 +-crf:v 30 
 +-b:v 6000k 
 +-maxrate:v 8000k 
 +-minrate:v 2000k 
 +-row-mt 1 
 +-frame-parallel:v 1 -tile-columns:v 2 
 +``` 
 + 
 +### SD-Profile 
 +  * worse parallelization and therefore speed than HD-profile 
 +  * worse rate-control than HD-profile (doesn't reach target bitrate) 
 +  * bufsize doesn't change anything 
 +  * no threads parallelizes best 
 +  * frame-parallel doesn't work (frame too small?) 
 +  * bitrate with crf is more like maxrate
  
  
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  • Last modified: 2020/06/13 14:34
  • by ischluff