[FFmpeg-user] Installing the ocv filter

[Paul B Mahol]

On 7/25/19, dimaseriy <dimaseriy1996 at yandex.ru> wrote:
> So what's the solution? Installing older opencv?

Yes, OpenCV 3.x does not support the legacy C interface anymore.
What for you use opencv in ffmpeg? The wrapper is pretty limited imho.

>
> 25.07.2019, 17:08, "Paul B Mahol" <onemda at gmail.com>:
>> 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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>>
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