[FFmpeg-trac] #8542(ffmpeg:new): ffmpeg use kmsgrab on wayland not working

[FFmpeg]

#8542: ffmpeg use kmsgrab on wayland not working
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             Reporter:  chenjie199234  |                     Type:  defect
               Status:  new            |                 Priority:  normal
            Component:  ffmpeg         |                  Version:  4.2
             Keywords:  kmsgrab        |               Blocked By:
             Blocking:                 |  Reproduced by developer:  0
Analyzed by developer:  0              |
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 i can't use ffmpeg's kmsgrab to capture screen on my pc
 OS:                      Archlinux
 WM:                      Sway 1.4
 ffmpeg:                  n4.2.2
 cpu:                     i5 7200u
 gpu:                     the cpu's HD620
 driver:                  intel-media-driver 19.4.0

 here is my ffmpeg cmd:
 exec on root:
 ffmpeg -f kmsgrab -i - -vf 'hwdownload,format=bgr0' output.mp4

 here is the out put:
 ffmpeg version n4.2.2 Copyright (c) 2000-2019 the FFmpeg developers built
 with gcc 9.2.1 (Arch Linux 9.2.1+20200130-2) 20200130
 configuration: --prefix=/usr --disable-debug --disable-static --disable-
 stripping --enable-fontconfig --enable-gmp --enable-gnutls --enable-gpl
 --enable-ladspa --enable-libaom --enable-libass --enable-libbluray
 --enable-libdav1d --enable-libdrm --enable-libfreetype --enable-libfribidi
 --enable-libgsm --enable-libiec61883 --enable-libjack --enable-libmfx
 --enable-libmodplug --enable-libmp3lame --enable-libopencore_amrnb
 --enable-libopencore_amrwb --enable-libopenjpeg --enable-libopus --enable-
 libpulse --enable-libsoxr --enable-libspeex --enable-libssh --enable-
 libtheora --enable-libv4l2 --enable-libvidstab --enable-libvorbis
 --enable-libvpx --enable-libwebp --enable-libx264 --enable-libx265
 --enable-libxcb --enable-libxml2 --enable-libxvid --enable-nvdec --enable-
 nvenc --enable-omx --enable-shared --enable-version3
   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
   libswscale      5.  5.100 /  5.  5.100
   libswresample   3.  5.100 /  3.  5.100
   libpostproc    55.  5.100 / 55.  5.100
 [kmsgrab @ 0x5644e2b79fc0] Using plane 31 to locate framebuffers.
 [kmsgrab @ 0x5644e2b79fc0] Failed to get framebuffer 122: Invalid
 argument.
 pipe:: Invalid argument

 i report this on sway's github:
 https://github.com/swaywm/sway/issues/4961

 they said this is a ffmpeg's bug.

--
Ticket URL: <https://trac.ffmpeg.org/ticket/8542>
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