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vp9 [2020/06/09 23:11]
beandog
vp9 [2023/04/19 21:54] (current)
beandog [ffmpeg]
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 ====== VP9 ====== ====== VP9 ======
  
 +  * [[https://​github.com/​webmproject/​libvpx/​tags|GitHub downloads]]
   * [[https://​sites.google.com/​a/​webmproject.org/​wiki/​ffmpeg/​vp9-encoding-guide|webm wiki: VP9 Encoding Guide]]   * [[https://​sites.google.com/​a/​webmproject.org/​wiki/​ffmpeg/​vp9-encoding-guide|webm wiki: VP9 Encoding Guide]]
   * [[https://​trac.ffmpeg.org/​wiki/​Encode/​VP9|FFmpeg and VP9 Encoding Guide]]   * [[https://​trac.ffmpeg.org/​wiki/​Encode/​VP9|FFmpeg and VP9 Encoding Guide]]
   * [[http://​ffmpeg.org/​ffmpeg-all.html#​libvpx|ffmpeg libvpx documentation]]   * [[http://​ffmpeg.org/​ffmpeg-all.html#​libvpx|ffmpeg libvpx documentation]]
   * [[https://​developers.google.com/​media/​vp9/​bitrate-modes|VP9 Bitrate Modes in Detail]] - Google'​s   * [[https://​developers.google.com/​media/​vp9/​bitrate-modes|VP9 Bitrate Modes in Detail]] - Google'​s
-  * [[https://www.texpion.com/2018/07/av1-vs-vp9-vs-avc-h264-vs-hevc-h265-1-lossless.html|AV1 vs VP9 vs AVC (h.264vs HEVC (h.265): Part I - Lossless]] - a good read, I like this one +  * [[http://wiki.webmproject.org/vp9/vp9-tips|VP9 Tips Encoding Modes and Recommended Command Line Options]] ​upstream'​s wiki 
-  * [[https://​github.com/​deterenkelt/Nadeshiko/wiki/Pitfalls-in-VP9|Pitfalls in VP9]] - goes in bit of detail about quality levels+  * [[https://​slhck.info/​video/​2017/​02/​24/​crf-guide.html|CRF Guide (Constant Rate Factor in x264, x265 and libvpx)]] 
 +  * [[https://​github.com/​HandBrake/HandBrake-docs/tree/master/​source/​docs/​en/​latest/​technical|HandBrake github repo of documentation]] 
 + 
 +==== vpxenc ==== 
 + 
 +By default, ''​vpxenc''​ will use 2-pass method for encoding. 
 + 
 +To gain CRF-type result, use ''​--end-usage=cq --cq-level=<​arg>''​ format, and then a 1-pass encode ''​--passes=1''​ Using this, ''​vpxenc''​ uses a default CQ of 32. 
 + 
 +I get different encoding times on multiple runs, even though it's producing the exact same files, so watch out for that. 
 + 
 + 
 +==== HandBrake ==== 
 + 
 +By default, HandBrake uses a CQ of 22. 
 + 
 +HandBrake will only use 2-passes if a bitrate is set as well. 
 + 
 +==== ffmpeg ==== 
 + 
 +You can use ''​ffmpeg''​ to get a deep level of output to see what it's doing, it uses the default CRF of 32: 
 + 
 +<​code>​ 
 +ffmpeg -loglevel debug -i sample.y4m -vcodec libvpx-vp9 sample.webm 
 +</​code>​ 
 + 
 +Relevant output: 
 + 
 +<​code>​ 
 +[libvpx-vp9 @ 0x55a6e613e3c0] ​  ​VP8E_SET_CPUUSED: ​            1 
 +[libvpx-vp9 @ 0x55a6e613e3c0] ​  ​VP8E_SET_ARNR_MAXFRAMES: ​     0 
 +[libvpx-vp9 @ 0x55a6e613e3c0] ​  ​VP8E_SET_ARNR_STRENGTH: ​      3 
 +[libvpx-vp9 @ 0x55a6e613e3c0] ​  ​VP8E_SET_ARNR_TYPE: ​          3 
 +[libvpx-vp9 @ 0x55a6e613e3c0] ​  ​VP8E_SET_STATIC_THRESHOLD: ​   0 
 +[libvpx-vp9 @ 0x55a6e613e3c0] ​  ​VP8E_SET_CQ_LEVEL: ​           32 
 +[libvpx-vp9 @ 0x55a6e613e3c0] ​  ​VP9E_SET_COLOR_SPACE: ​        0 
 +[libvpx-vp9 @ 0x55a6e613e3c0] ​  ​VP9E_SET_COLOR_RANGE: ​        0 
 +[libvpx-vp9 @ 0x55a6e613e3c0] ​  ​VP9E_SET_TARGET_LEVEL: ​       255 
 +</​code>​

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