vp9 encoder missing

[marcokuchla]

Expected behaviour

VP9 encoder available to use because it is supposed to be compiled inside manylinux custom image:
... cd ~/ffmpeg_sources && git clone --depth 1 https://chromium.googlesource.com/webm/libvpx.git && cd libvpx && ./configure --prefix="$HOME/ffmpeg_build" --disable-examples --disable-unit-tests --enable-vp9-highbitdepth --as=yasm --enable-pic && make -j4 && make install ... --enable-libvpx ...

Actual behaviour

Encoder is missing.

Steps to reproduce

I've installed opencv-contrib-python (3.4.0.12) inside a python:3 Docker image. Then the following commands:

>>> import cv2
>>> writer = cv2.VideoWriter()
>>> writer.open('video.webm', cv2.VideoWriter_fourcc(*'VP90'), 30, (100,100))
OpenCV: FFMPEG: tag 0x30395056/'VP90' is not supported with codec id 167 and format 'webm / WebM'
Could not find encoder for codec id 167: Encoder not found
False

[skvark]

Yes, it seems that vp9 is missing. Similar issue: https://www.centos.org/forums/viewtopic.php?t=44422

[skvark]

I'll try to reorder the FFmpeg build flags, it seems that the order matters.

[skvark]

Solved it. --enable-shared was missing from libvpx build flags. FFmpeg build detected libvpx but did not actually use it. Should be ok now. I'm currently building x86_64 image. Both of the fixed images should be up soon and the Linux builds should start passing again.