screen capture codec (x11grab) not working on Linux

[leonyu]

Issue: screen capture codec (x11grab) not working on Linux

ffmpeg screen capture command does not appear to be enabled during compilation. When running any of the Linux commands on this page (https://trac.ffmpeg.org/wiki/Capture/Desktop), following error occurs:

ffmpeg version 4.2.3 Copyright (c) 2000-2020 the FFmpeg developers
  built with gcc 7.5.0 (crosstool-NG 1.24.0.123_1667d2b)
  configuration: --prefix=/home/leonyu/miniconda3/envs/ffmpeg-wrapper --cc=/home/conda/feedstock_root/build_artifacts/ffmpeg_1590573566052/_build_env/bin/x86_64-conda_cos6-linux-gnu-cc --disable-doc --disable-openssl --enable-avresample --enable-gnutls --enable-gpl --enable-hardcoded-tables --enable-libfreetype --enable-libopenh264 --enable-libx264 --enable-pic --enable-pthreads --enable-shared --enable-static --enable-version3 --enable-zlib --enable-libmp3lame
  libavutil      56. 31.100 / 56. 31.100
  libavcodec     58. 54.100 / 58. 54.100
  libavformat    58. 29.100 / 58. 29.100
  libavdevice    58.  8.100 / 58.  8.100
  libavfilter     7. 57.100 /  7. 57.100
  libavresample   4.  0.  0 /  4.  0.  0
  libswscale      5.  5.100 /  5.  5.100
  libswresample   3.  5.100 /  3.  5.100
  libpostproc    55.  5.100 / 55.  5.100
Unknown input format: 'x11grab'
exit 1

---

Environment (conda list):

$ conda list

# packages in environment at /home/leonyu/miniconda3/envs/ffmpeg-wrapper:
#
# Name                    Version                   Build  Channel
_libgcc_mutex             0.1                 conda_forge    conda-forge
_openmp_mutex             4.5                       0_gnu    conda-forge
bzip2                     1.0.8                h516909a_2    conda-forge
ffmpeg                    4.2.3                h167e202_0    conda-forge
freetype                  2.10.2               he06d7ca_0    conda-forge
gmp                       6.2.0                he1b5a44_2    conda-forge
gnutls                    3.6.13               h79a8f9a_0    conda-forge
lame                      3.100             h14c3975_1001    conda-forge
libgcc-ng                 9.2.0                h24d8f2e_2    conda-forge
libgomp                   9.2.0                h24d8f2e_2    conda-forge
libiconv                  1.15              h516909a_1006    conda-forge
libpng                    1.6.37               hed695b0_1    conda-forge
libstdcxx-ng              9.2.0                hdf63c60_2    conda-forge
nettle                    3.4.1             h1bed415_1002    conda-forge
openh264                  2.1.1                h8b12597_0    conda-forge
x264                      1!152.20180806       h14c3975_0    conda-forge
zlib                      1.2.11            h516909a_1006    conda-forge

Details about conda and system ( conda info ):

$ conda info


     active environment : ffmpeg-wrapper
    active env location : /home/leonyu/miniconda3/envs/ffmpeg-wrapper
            shell level : 2
       user config file : /home/leonyu/.condarc
 populated config files : 
          conda version : 4.8.2
    conda-build version : not installed
         python version : 3.7.6.final.0
       virtual packages : __cuda=10.2
                          __glibc=2.31
       base environment : /home/leonyu/miniconda3  (writable)
           channel URLs : https://repo.anaconda.com/pkgs/main/linux-64
                          https://repo.anaconda.com/pkgs/main/noarch
                          https://repo.anaconda.com/pkgs/r/linux-64
                          https://repo.anaconda.com/pkgs/r/noarch
          package cache : /home/leonyu/miniconda3/pkgs
                          /home/leonyu/.conda/pkgs
       envs directories : /home/leonyu/miniconda3/envs
                          /home/leonyu/.conda/envs
               platform : linux-64
             user-agent : conda/4.8.2 requests/2.22.0 CPython/3.7.6 Linux/5.4.0-37-generic ubuntu/20.04 glibc/2.31
                UID:GID : 1000:1000
             netrc file : None
           offline mode : False

[hmaarrfk]

it is likely that we have to compile with x11grab

We might need to enable it with

  --enable-libxcb          enable X11 grabbing using XCB [autodetect]
  --enable-libxcb-shm      enable X11 grabbing shm communication [autodetect]
  --enable-libxcb-xfixes   enable X11 grabbing mouse rendering [autodetect]
  --enable-libxcb-shape    enable X11 grabbing shape rendering [autodetect]

https://github.com/FFmpeg/FFmpeg/blob/f912cefb8343efc511aa72963b9f66e327ec0b88/configure#L296

[hmaarrfk]

It seems that in recent builds it is enabled, but we aren't including libxcb as a dependency:

2022-05-20T10:37:06.0882540Z WARNING (ffmpeg,lib/libavdevice.so.59.4.100): Needed DSO lib/libxcb.so.1 found in ['libxcb']
2022-05-20T10:37:06.0883795Z WARNING (ffmpeg,lib/libavdevice.so.59.4.100): .. but ['libxcb'] not in reqs/run, (i.e. it is overlinking) (likely) or a missing dependency (less likely)
2022-05-20T10:37:06.0903480Z WARNING (ffmpeg,lib/libavdevice.so.59.4.100): Needed DSO lib/libxcb-shm.so.0 found in ['libxcb']
2022-05-20T10:37:06.0904676Z WARNING (ffmpeg,lib/libavdevice.so.59.4.100): .. but ['libxcb'] not in reqs/run, (i.e. it is overlinking) (likely) or a missing dependency (less likely)
2022-05-20T10:37:06.0921626Z WARNING (ffmpeg,lib/libavdevice.so.59.4.100): Needed DSO lib/libxcb-shape.so.0 found in ['libxcb']
2022-05-20T10:37:06.0922654Z WARNING (ffmpeg,lib/libavdevice.so.59.4.100): .. but ['libxcb'] not in reqs/run, (i.e. it is overlinking) (likely) or a missing dependency (less likely)
2022-05-20T10:37:06.0944032Z WARNING (ffmpeg,lib/libavdevice.so.59.4.100): Needed DSO lib/libxcb-xfixes.so.0 found in ['libxcb']
2022-05-20T10:37:06.0945261Z WARNING (ffmpeg,lib/libavdevice.so.59.4.100): .. but ['libxcb'] not in reqs/run, (i.e. it is overlinking) (likely) or a missing dependency (less likely)

https://dev.azure.com/conda-forge/feedstock-builds/_build/results?buildId=509302&view=logs&j=656edd35-690f-5c53-9ba3-09c10d0bea97&t=e5c8ab1d-8ff9-5cae-b332-e15ae582ed2d