[Libav-user] build FFMPEG ubuntu 16

[retep peter]

Hello Richard
many thanks for your advice. You save my life :)
I downloaded ubuntu developer source of ffmpeg with following command :
apt-get source ffmpeg
Now I have got correct symbols in libavxxx  .


Best Regards
retepik

po 8. 6. 2020 o 21:07 Richard Hussong <rhussong at westpond.com> napísal(a):

>
>
> On Mon, Jun 8, 2020 at 8:16 AM retep peter <retepik at gmail.com> wrote:
>
>> Hello Richard,
>> How can I download ffmpeg 2.8.15 source for Ubuntu developers?
>>
>
> You can download the original source package and the Ubuntu patches from
> https://packages.ubuntu.com/source/xenial/ffmpeg (look near the bottom of
> the page). You'll probably need to use the Ubuntu build tools to apply the
> patches and build. I can't help you there.
>
> - Richard
>
>
>> Thanks
>> retepik
>>
>> ne 7. 6. 2020 o 1:45 Richard Hussong <rhussong at westpond.com> napísal(a):
>>
>>>
>>> On Fri, Jun 5, 2020 at 11:33 AM retep peter <retepik at gmail.com> wrote:
>>>
>>>> I need a advice :) I have tried compile ffmpeg 2.8.15 from source under
>>>> Ubuntu 16 LTS. I need compile it for one SDK, I can't use ffmpeg from
>>>> repository. I compiled ffmpeg successfully. But I have got issues with my
>>>> specify SDK, when I try compile my code with SDK:
>>>>
>>>> SDK.so: undefined reference to `av_rescale_q at LIBAVUTIL_FFMPEG_54'
>>>>
>>>> I suppose that issues are in symbols name. I tried read symbols with
>>>>
>>>> readelf -s libavutil-ffmpeg.so.54
>>>>
>>>> I get in my compiled ffmpeg something like this
>>>>
>>>>    158: 0000000000024170    55 FUNC    GLOBAL DEFAULT   12 av_rescale_q@@LIBAVUTIL_54
>>>>
>>>> I tried this with libavutil-ffmpeg.so.54 from repository and i get
>>>>
>>>>    158: 0000000000024170    55 FUNC    GLOBAL DEFAULT   12 av_rescale_q@@LIBAVUTIL_FFMPEG_54
>>>>
>>>> I suppose that I need add a suffix "FFMPEG" to symbols name. I use this
>>>> configuration for build ffmpeg, it same as configuration of build from
>>>> repository :
>>>>
>>>> sudo ./configure --prefix=/usr --extra-version=0ubuntu0.16.04.1 --build-suffix=-ffmpeg --toolchain=hardened --libdir=/usr/lib/x86_64-linux-gnu --incdir=/usr/include/x86_64-linux-gnu --cc=cc --cxx=g++ --enable-gpl --enable-shared --disable-stripping --disable-decoder=libopenjpeg --disable-decoder=libschroedinger --enable-avresample --enable-avisynth --enable-gnutls --enable-ladspa --enable-libass --enable-libbluray --enable-libbs2b --enable-libcaca --enable-libcdio --enable-libflite --enable-libfontconfig --enable-libfreetype --enable-libfribidi --enable-libgme --enable-libgsm --enable-libmodplug --enable-libmp3lame --enable-libopenjpeg --enable-libopus --enable-libpulse --enable-librtmp --enable-libschroedinger --enable-libshine --enable-libsnappy --enable-libsoxr --enable-libspeex --enable-libssh --enable-libtheora --enable-libtwolame --enable-libvorbis --enable-libvpx --enable-libwavpack --enable-libwebp --enable-libx265 --enable-libxvid --enable-libzvbi --enable-openal --enable-opengl --enable-x11grab --enable-libdc1394 --enable-libiec61883 --enable-libzmq --enable-frei0r --enable-libx264 --enable-libopencv
>>>>
>>>> Could you help me how add suffix "-ffmpeg" to symbols name? Thanks
>>>>
>>> The libavxxx-ffmpeg libraries are supplied by the Ubuntu developers to
>>> support the Ubuntu version of ffmpeg. If you build and install ffmpeg
>>> yourself (not from the Debian ffmpeg source package), it will build the
>>> "normal" libavxxx libraries and build ffmpeg against them, and those
>>> libraries will be installed somewhere, by default /usr/local/lib, I
>>> believe. I don't know for sure if libavutil.so.54 is compatible with
>>> libavutil-ffmpeg.so.54, though it is likely that it is. If so, you may be
>>> able to use LD_PRELOAD to load the libraries you need before running, but I
>>> don't know if your SDK allows that, or if it would necessarily work.
>>>
>>> - Richard
>>>
>>>> Best Regard
>>>>
>>>> retepik
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>>>>
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>>>
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>>
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>
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