[FFmpeg-trac] #7440(ffmpeg:new): Black flickering

[FFmpeg]

#7440: Black flickering
-------------------------------------+-------------------------------------
             Reporter:  infiniter    |                     Type:  defect
               Status:  new          |                 Priority:  normal
            Component:  ffmpeg       |                  Version:  git-
             Keywords:  flickering   |  master
  screencast                         |               Blocked By:
             Blocking:               |  Reproduced by developer:  0
Analyzed by developer:  0            |
-------------------------------------+-------------------------------------
 Summary of the bug:
 I m just casual user trying to screencast my laptop screen (with sound,
 irrelevant) on my Manjaro Lenovo ideapad 710S

 How to reproduce:
 {{{
 ffmpeg -video_size 1920x1080 -framerate 35 -f x11grab -i :0.0 -f alsa -ac
 2 -i pulse ~/Videos/screencast_$(date +%s).mp4 &> /dev/null & echo $! >
 /tmp/screencast_pid

 ffmpeg info :
 ffmpeg version n4.0.2 Copyright (c) 2000-2018 the FFmpeg developers
   built with gcc 8.2.0 (GCC)
   configuration: --prefix=/usr --disable-debug --disable-static --disable-
 stripping --enable-avresample --enable-fontconfig --enable-gmp --enable-
 gnutls --enable-gpl --enable-ladspa --enable-libaom --enable-libass
 --enable-libbluray --enable-libdrm --enable-libfreetype --enable-
 libfribidi --enable-libgsm --enable-libiec61883 --enable-libjack --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-nvenc --enable-omx --enable-
 shared --enable-version3
   libavutil      56. 14.100 / 56. 14.100
   libavcodec     58. 18.100 / 58. 18.100
   libavformat    58. 12.100 / 58. 12.100
   libavdevice    58.  3.100 / 58.  3.100
   libavfilter     7. 16.100 /  7. 16.100
   libavresample   4.  0.  0 /  4.  0.  0
   libswscale      5.  1.100 /  5.  1.100
   libswresample   3.  1.100 /  3.  1.100
   libpostproc    55.  1.100 / 55.  1.100

 built on Lenovo ideapad 710S, Manjaro
 }}}

 VIDEO : https://streamable.com/5wlu4

 Same thing happens with just screencasting terminals, browser, anything
 really...but i noticed there are moments when it happens really rarely,
 doesnt look like its related to LOAD on my system thou.

 I m not really skilled this kind of stuff, so please ask for anything you
 need to help me, i ll answer instantly (on my mail at least).

--
Ticket URL: <https://trac.ffmpeg.org/ticket/7440>
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