[Slackbuilds-users] ffmpeg4 not building

[Luveh Keraph]

Like I reported, 14.2 ffmpeg4 will not build with opencv, but it will with
opencv-legacy - provided that opencv-legacy is built before tesseract.
opencv (or opencv-legacy) is anyway optional for ffmpeg (both 3 and 4).

On Thu, Apr 23, 2020 at 5:51 AM Jheengut Pritvi <z.coldplayer at gmail.com>
wrote:

> Hi Luveh,
>
> I checked ffmpeg, ffmpeg3 builds with opencv-legacy.
> The readme of ffmpeg4 does not mention this detail BTW.
>
> The ffmpeg4 of slackware64-current builds without the need of openvc
> though.
>
> On Mon, 20 Apr 2020 at 22:13, Luveh Keraph <1.41421 at gmail.com> wrote:
>
>> With the provisos mentioned in my previous communication, I was able to
>> build ffmpeg4.
>>
>> On Mon, Apr 20, 2020 at 11:36 AM Luveh Keraph <1.41421 at gmail.com> wrote:
>>
>>> It is building all right, in that it did not choke on opencv as I
>>> reported here before. However, I could not get opencv-legacy to build with
>>> tesseract already installed. I had to remove tesseract, build and install
>>> opencv-legacy, build and install tesseract, and then launch the build of
>>> ffmpeg4.  The build job for ffmpeg4 is still ongoing; I'll report on the
>>> outcome.
>>>
>>> On Mon, Apr 20, 2020 at 8:49 AM Jheengut Pritvi <z.coldplayer at gmail.com>
>>> wrote:
>>>
>>>> Hi,
>>>> I have not tried the latest version but can you confirm if the legacy
>>>> opencv is needed instead.
>>>>
>>>>
>>>> On Sun, 19 Apr 2020 at 20:15, Luveh Keraph <1.41421 at gmail.com> wrote:
>>>>
>>>>> 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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