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vp9 [2020/06/10 05:11] – beandogvp9 [2023/04/20 03:54] (current) – [ffmpeg] beandog
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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.264) vs 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 a 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 a 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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