Convert video with vp9 codec using ffmpeg

I am trying to convert input.mp4 video to output.mkv using vp9 codec. I have install development version of ffmpeg via: brew install ffmpeg --devel.

ffmpeg -i input.mp4 -vcodec vp9 output.mkv

But I am getting error: Unknown encoder 'vp9' even the vp9 is included: ffmpeg -codecs

Pavel Binar

Posted 2014-01-02T22:28:40.327

Reputation: 285

1brew install ffmpeg --with-libvpx --with-opus – Joel Purra – 2015-02-21T18:54:56.140

Answers

The most basic command is:

ffmpeg -i input.mp4 -c:v libvpx-vp9 -c:a libopus output.webm

See FFmpeg Wiki: VP9 for more info.

llogan

Posted 2014-01-02T22:28:40.327

Reputation: 31 929

Thanks, but command do not work. Here is the log: https://gist.github.com/pavelbinar/8236408

The problem probably is the fact that I do not have vp9 encoder installed/included (I thought that it in the ffmpeg 2.x) https://gist.github.com/pavelbinar/8236426

– Pavel Binar – 2014-01-03T11:23:12.833

I installed ffmpeg and all its components via this guide and it works now! https://sites.google.com/a/webmproject.org/wiki/ffmpeg/building-with-libvpx

– Pavel Binar – 2014-01-03T12:22:38.080

With my version of ffmpeg,

$ ffmpeg -version
ffmpeg version 2.3.3 Copyright (c) 2000-2014 the FFmpeg developers

the command looks like this

ffmpeg -y -i input.mkv -c:v libvpx-vp9 -b:v 2000k -pass 1 -an -f webm /dev/null
ffmpeg    -i input.mkv -c:v libvpx-vp9 -b:v 2000k -pass 2 -c:a opus -b:a 64k -f webm output.webm

i.e.

leave out the experimental flags
do a two pass encoding, because the first two seconds of the output are blurry otherwise. Doing a two pass encoding is also faster than single pass.
when doing 2 pass, you do not need to encode the audio in the first pass as @FrankGalligan noted in a comment

Single pass is/was broken, according to http://wiki.webmproject.org/vp9/known-issues

user7610

Posted 2014-01-02T22:28:40.327

Reputation: 336

Do not set -strict experimental. That was for older FFmpeg. When doing 2 pass, you do not need to encode the audio in the first pass. ffmpeg -y -i input.mkv -c:v libvpx-vp9 -b:v 2000k -pass 1 -an -f webm /dev/null ffmpeg -i input.mkv -c:v libvpx-vp9 -b:v 2000k -pass 2 -c:a opus -b:a 64k -f webm output.webm – FrankGalligan – 2015-03-03T01:32:00.817