[FFmpeg-user] Installing the ocv filter

[Paul B Mahol]

On 7/25/19, dimaseriy <dimaseriy1996 at yandex.ru> wrote:
> I tried
>
> mkdir -p ~/ffmpeg_sources ~/bin
> cd ~/ffmpeg_sources
> wget -O ffmpeg-snapshot.tar.bz2
> https://ffmpeg.org/releases/ffmpeg-snapshot.tar.bz2 && tar xjvf
> ffmpeg-snapshot.tar.bz2 && cd ffmpeg
>
> but I got
>
> $ PATH="$HOME/bin:$PATH" PKG_CONFIG_PATH="$HOME/ffmpeg_build/lib/pkgconfig"
> ./configure --prefix="$HOME/ffmpeg_build" --pkg-config-flags="--static"
> --extra-cflags="-I$HOME/ffmpeg_build/include"
> --extra-ldflags="-L$HOME/ffmpeg_build/lib" --extra-libs="-lpthread -lm"
> --bindir="$HOME/bin" --enable-gpl --enable-nonfree --enable-avresample
> --enable-avisynth --enable-libass --enable-libcaca --enable-libcdio
> --enable-libfontconfig --enable-libfreetype --enable-libfribidi
> --enable-libgsm --enable-libopenjpeg --enable-libopenmpt --enable-libopus
> --enable-libpulse --enable-librubberband --enable-librsvg --enable-libsnappy
> --enable-libsoxr --enable-libspeex --enable-libssh --enable-libtheora
> --enable-libtwolame --enable-libvorbis --enable-libvpx --enable-libwavpack
> --enable-libwebp --enable-libx265 --enable-libxml2 --enable-libxvid
> --enable-libzmq --enable-libzvbi --enable-omx --enable-openal
> --enable-opengl --enable-sdl2 --enable-libdc1394 --enable-libdrm
> --enable-libiec61883 --enable-chromaprint --enable-frei0r --enable-libopencv
> --enable-libx264 --enable-shared
> ERROR: libopencv not found
>
> If you think configure made a mistake, make sure you are using the latest
> version from Git.  If the latest version fails, report the problem to the
> ffmpeg-user at ffmpeg.org mailing list or IRC #ffmpeg on irc.freenode.net.
> Include the log file "ffbuild/config.log" produced by configure as this will
> help
> solve the problem.
>
> However
>
> $ dpkg -l | grep 'libopencv-core'
> ii  libopencv-core-dev:amd64                        3.2.0+dfsg-4ubuntu0.1
>                            amd64        development files for
> libopencv-core3.2
> ii  libopencv-core3.2:amd64                          3.2.0+dfsg-4ubuntu0.1
>                             amd64        computer vision core library
> $ dpkg -l | grep 'libopencv-dev'
> ii  libopencv-dev                                   3.2.0+dfsg-4ubuntu0.1
>                            amd64        development files for opencv

Note that from some version onward they dropped C support IIRC,
so you could not have it even if you have it installed.

>
> 25.07.2019, 15:04, "Moritz Barsnick" <barsnick at gmx.net>:
>> On Thu, Jul 25, 2019 at 03:34:59 -0400, Ted Park wrote:
>>>  > 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.
>>
>> Interestingly, the Ubuntu build is apparently built with
>> "—enable-libopencv", but they managed not to get the "ocv" filter in.
>>
>>>  > 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.
>>
>> And the development package as well (so perhaps libopencv-dev and
>> libopencv-core-dev).
>>
>> Moritz
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