[FFmpeg-user] Installing the ocv filter

[dimaseriy]

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

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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