> I want to use the ocv filer for ffmpeg. The documentation says:
> 
> "To enable this filter, install the libopencv library and headers and 
> configure FFmpeg with --enable-libopencv .”

Do what the documentation says?

> I use ffmpeg from Ubuntu repos. 

You need to “configure FFmpeg with —enable-libopencv” after installing the 
library, then compile yourself, or find a ffmpeg with the library enabled. The 
ffmpeg from the Ubuntu repo is old.

> $ ffmpeg -filters | grep 'ocv'
> ffmpeg version 3.4.6-0ubuntu0.18.04.1 Copyright (c) 2000-2019 the FFmpeg 
> developers


> How do I make this filter available? What packages should I install in Ubuntu 
> 18.04 (it has many packages called libopencv*) and should I build ffmpeg from 
> source?

Try installing the core library then configuring.

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