Installation issues on Ubuntu 18.4

[iscsrl]

I cannot make the pip install work.
My issue is:

error: command 'x86_64-linux-gnu-gcc' failed with exit status 1
    
    ----------------------------------------
Command "/usr/bin/python3 -u -c "import setuptools, tokenize;__file__='/tmp/pip-build-sz1dte73/av/setup.py';f=getattr(tokenize, 'open', open)(__file__);code=f.read().replace('\r\n', '\n');f.close();exec(compile(code, __file__, 'exec'))" install --record /tmp/pip-knt6xduz-record/install-record.txt --single-version-externally-managed --compile --user --prefix=" failed with error code 1 in /tmp/pip-build-sz1dte73/av/

I resolved the installation problem with "av" installing it at the version 6.2.0 but aiortc keeps trying to install latest version and i get that issue while installing the av dependency.
Any tips?

[jlaine]

There is too little information for me to help here, don't you have a fuller error message?

[BrettRD]

Perhaps this error?

building 'av.codec.codec' extension
  creating build/temp.linux-x86_64-3.6/src/av/codec
  x86_64-linux-gnu-gcc -pthread -DNDEBUG -g -fwrapv -O2 -Wall -g -fstack-protector-strong -Wformat -Werror=format-security -Wdate-time -D_FORTIFY_SOURCE=2 -fPIC -I/usr/include/python3.6m -Iinclude -I/usr/include/x86_64-linux-gnu -Ibuild/temp.linux-x86_64-3.6/include -I/usr/include/python3.6m -Ibuild/temp.linux-x86_64-3.6/include -c src/av/codec/codec.c -o build/temp.linux-x86_64-3.6/src/av/codec/codec.o
  src/av/codec/codec.c: In function ‘__pyx_pymod_exec_codec’:
  src/av/codec/codec.c:6061:36: error: ‘AV_CODEC_CAP_HARDWARE’ undeclared (first use in this function); did you mean ‘AV_CODEC_CAP_DR1’?
     __pyx_t_7 = __Pyx_PyInt_From_int(AV_CODEC_CAP_HARDWARE); if (unlikely(!__pyx_t_7)) __PYX_ERR(0, 124, __pyx_L1_error)
                                      ^~~~~~~~~~~~~~~~~~~~~
                                      AV_CODEC_CAP_DR1
  src/av/codec/codec.c:6061:36: note: each undeclared identifier is reported only once for each function it appears in
  src/av/codec/codec.c:6082:36: error: ‘AV_CODEC_CAP_HYBRID’ undeclared (first use in this function); did you mean ‘AV_CODEC_CAP_DR1’?
     __pyx_t_7 = __Pyx_PyInt_From_int(AV_CODEC_CAP_HYBRID); if (unlikely(!__pyx_t_7)) __PYX_ERR(0, 128, __pyx_L1_error)
                                      ^~~~~~~~~~~~~~~~~~~
                                      AV_CODEC_CAP_DR1
  error: command 'x86_64-linux-gnu-gcc' failed with exit status 1
  
  ----------------------------------------
  Failed building wheel for av
  Running setup.py clean for av
Failed to build av

Which probably relates to this ticket about attempting to pip3 install av with ffmpeg < 4
PyAV-Org/PyAV#604

Edit:
Doing a

sudo add-apt-repository ppa:jonathonf/ffmpeg-4
sudo apt upgrade

will upgrade your ffmpeg to 4+ on your ubuntu18.04 and will make the av package behave itself.
It's working for me now.

[jlaine]

Yes, it's explicitly documented in both aiortc and PyAV that FFmpeg 4 or better is needed

[pranav-bhatt]

For some people, the packages libavcodec-dev are old, so you would need to install ffmpeg AND upgrade other packages from Rob Savouy's PPA in order to sort this issue.