[Slackbuilds-users] ffmpeg4 not building

[Luveh Keraph]

I am using the following ffmpeg4.sqf file in a freshly installed (and
up-to-date) 14.2 system:

libass
chromaprint
frei0r
ladspa_sdk
libaom
libbluray
libbs2b
celt
libdc1394
libfdk-aac
flite
libgme
gsm
libiec61883
libavc1394
libilbc
libmodplug
lame
opencore-amr
opencv
opus
rtmpdump
rubberband
snappy
speex
tesseract
twolame
vid.stab
libwebp
x264
x265
xvidcore
zeromq
zvbi
ffmpeg4 | BINS=yes CHROMAPRINT=yes FREI0R=yes LADSPA=yes LIBAOM=yes
LIBBLURAY=yes LIBBS2B=yes LIBCELT=yes LIBDC1394=yes LIBFDK_AAC=yes
LIBFLITE=yes LIBGME=yes LIBGSM=yes LIBIEC61883=yes LIBILBC=yes
LIBMODPLUG=yes LIBMP3LAME=yes LIBOPENCORE=yes LIBOPENCV=yes LIBOPUS=yes
LIBRTMP=yes LIBRUBBERBAND=yes LIBSNAPPY=yes LIBSPEEX=yes LIBTESSERACT=yes
LIBTWOLAME=yes LIBVIDSTAB=yes LIBWEBP=yes LIBX264=yes LIBX265=yes
LIBXVID=yes LIBZMQ=yes LIBZVBI=yes

I encountered the following issues:

1. var-plugin-sdk is required for rubberband.
2. leptonica is required for tesseract (I think).
3. ffmpeg4 seems to be looking for opencv, while the script above installs
opencv4:

ffmpeg-4.1/tests/checkasm/jpeg2000dsp.c
ffmpeg-4.1/tests/checkasm/synth_filter.c
ffmpeg-4.1/tests/checkasm/vf_nlmeans.c
ffmpeg-4.1/tests/tiny_psnr.c
ffmpeg-4.1/COPYING.LGPLv2.1
ffmpeg-4.1/README.md
ffmpeg-4.1/CONTRIBUTING.md
ERROR: opencv not found using pkg-config

# pkg-config --list-all|grep opencv
opencv4                             OpenCV - Open Source Computer Vision
Library
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