VP9 Video Codec

http://www.webmproject.org/vp9/

WebM Repositories

libvpx: VP8/VP9 Codec SDK

pull	http://git.chromium.org/webm/libvpx.git
push	ssh://gerrit.chromium.org:29418/webm/libvpx.git
browse	http://git.chromium.org/gitweb/?p=webm/libvpx.git
browse (mirror)	http://code.google.com/p/webm/source/browse/?repo=libvpx
API Reference	http://www.webmproject.org/docs/vp8-sdk/

对于很多带有WEBM/WEBP文件容器的码流需要进行demux才能解码(但是上面的libvpx内嵌了demux video，能够直接支持WEBM/WEBP的解码,不再需要另外附加下面的demux。对于其它的codec可能需要下面的demux支持):

libwebm: WebM File Parser

pull	http://git.chromium.org/webm/libwebm.git
push	ssh://gerrit.chromium.org:29418/webm/libwebm.git
browse	http://git.chromium.org/gitweb/?p=webm/libwebm.git
browse (mirror)	http://code.google.com/p/webm/source/browse/?repo=libwebm

 

pull	http://git.chromium.org/webm/libwebp.git
push	ssh://gerrit.chromium.org:29418/webm/libwebp.git
browse	http://git.chromium.org/gitweb/?p=webm/libwebp.git
browse (mirror)	http://code.google.com/p/webm/source/browse/?repo=libwebp

编译过程中的2个大的issue：

1. 如果运行

git clone 的时候发生：

fatal: fsync error ...., fatal : index pack failed 错误，原因是因为这个git 的目录的权限被改写成了只读，需要手工改成可写。

 

2. 如果编译过程中test编译不过去，可以disable，在有些版本的libvpx中好像缺少了test相关的代码。

https://code.google.com/p/webm/issues/detail?id=498

 

3. VP9 High bitdepth debug版本的编译

目前还是处于试验版本阶段，需要在configure中enable：

./configure --disable-sse --disable-sse2 --disable-sse3 --disable-ssse3 --disable-vp8 --disable-mmx --as=nasm --disable-unit-tests --enable-debug-libs --enable-experimental --enable-vp9-high --enable-high-quant

 

编译成功后，vpxenc中会有bitdepth的选项：

VP9 Specific Options:

            --cpu-used=            CPU Used (-16..16)

            --auto-alt-ref=        Enable automatic alt reference frames

            --noise-sensitivity=   Noise sensitivity (frames to blur)

            --sharpness=           Filter sharpness (0-7)

            --static-thresh=       Motion detection threshold

            --tile-columns=        Number of tile columns to use, log2

            --tile-rows=           Number of tile rows to use, log2

            --arnr-maxframes=      AltRef Max Frames

            --arnr-strength=       AltRef Strength

            --arnr-type=           AltRef Type

            --tune=                Material to favor

                                          psnr, ssim

            --cq-level=            Constant/Constrained Quality level

            --max-intra-rate=      Max I-frame bitrate (pct)

            --lossless=            Lossless mode

            --frame-parallel=      Enable frame parallel decodability features

            --aq-mode=             Adaptive quantization mode

                                          off, variance, complexity, cyclic

            --frame_boost=         Enable frame periodic boost (0: off (default), 1: on)

  -b , --bit-depth=           Bit depth for codec (8 for version <=1, 10 or 12 for version 2)

                                          8, 10, 12

            --input-bit-depth=     Bit depth of input

 

可以用下面的命令来进行编码：

 

vpxenc -w 352 -h 288 --codec=vp9 --passes=2 --i420 --profile=2 -o out.vp9 test.yuv --experimental-bitstream -b 12 --input-bit-depth=12  

 

使用了PASS2的编码：

Pass 1/2 frame   64/65      9880B    1235b/f   37050b/s  351611 us (182.02 fps)

Pass 2/2 frame   64/40     72759B   61930 ms 1.03 fps [ETA  0:00:34]     822F    275F   454F    259F    187F   3967F    304F    327F    473F    136F    127F    209F    225F    159F    172F    105F   3322F    139F    305F    229F    445F    379F Pass 2/2 frame   64/64     86083B   10760b/f  322811b/s  106387 ms (0.60 fps)

 

各种视频编码器的命令行格式(zz)

 

VP9 Video Codec Summary

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Last modified 2013-08-08

VP9, the WebM Project’s next-generation open video codec, became available on June 17, 2013. This page summarizes post-release VP9 topics of interest to the WebM community.

Status Updates

• webm-discuss, 2013-07-24
• webm-discuss, 2013-05-08

Acquiring VP9 (libvpx)

As of 2013-06-17, V