title: ffmpeg. Segmentation fault when input process end
body: <p>Im using xvfb-run with katalon cli command to execute selenium tests inside docker container (ubuntu 16)</p>
  
  <pre><code>xvfb-run --listen-tcp --server-num 44 --auth-file /tmp/xvfb.auth -s '-ac -screen 0 1024x768x24' katalon -browserType=Firefox -retry=0 -statusDelay=15 -testSuitePath=Test Suites/Full_cases -runMode=console -reportFolder=/katalon/report -projectPath=/katalon/project.prj &amp;
  </code></pre>
  
  <p>and ffmpeg command to record video</p>
  
  <pre><code>ffmpeg -y -f x11grab -video_size 1024x768 -i :44 -codec:v libx264 -r 12 /katalon/report/output_2.mp4
  </code></pre>
  
  <p>But when the xvf-run process ends i have a ffmpeg segmentation fault error. Output file doesn't save.</p>
  
  <pre><code>ffmpeg version 2.8.15-0ubuntu0.16.04.1 Copyright (c) 2000-2018 the FFmpeg developers
    built with gcc 5.4.0 (Ubuntu 5.4.0-6ubuntu1~16.04.10) 20160609
    configuration: --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
    libavutil      54. 31.100 / 54. 31.100
    libavcodec     56. 60.100 / 56. 60.100
    libavformat    56. 40.101 / 56. 40.101
    libavdevice    56.  4.100 / 56.  4.100
    libavfilter     5. 40.101 /  5. 40.101
    libavresample   2.  1.  0 /  2.  1.  0
    libswscale      3.  1.101 /  3.  1.101
    libswresample   1.  2.101 /  1.  2.101
    libpostproc    53.  3.100 / 53.  3.100
  Input #0, x11grab, from ':44':
    Duration: N/A, start: 1584962410.149890, bitrate: N/A
      Stream #0:0: Video: rawvideo (BGR[0] / 0x524742), bgr0, 1024x768, 29.97 fps, 29.97 tbr, 1000k tbn, 29.97 tbc
  No pixel format specified, yuv444p for H.264 encoding chosen.
  Use -pix_fmt yuv420p for compatibility with outdated media players.
  [libx264 @ 0x15e1a80] using cpu capabilities: MMX2 SSE2Fast SSSE3 SSE4.2 AVX FMA3 AVX2 LZCNT BMI2
  [libx264 @ 0x15e1a80] profile High 4:4:4 Predictive, level 3.1, 4:4:4 8-bit
  [libx264 @ 0x15e1a80] 264 - core 148 r2643 5c65704 - H.264/MPEG-4 AVC codec - Copyleft 2003-2015 - http://www.videolan.org/x264.html - options: cabac=1 ref=3 deblock=1:0:0 analyse=0x3:0x113 me=hex subme=7 psy=1 psy_rd=1.00:0.00 mixed_ref=1 me_range=16 chroma_me=1 trellis=1 8x8dct=1 cqm=0 deadzone=21,11 fast_pskip=1 chroma_qp_offset=4 threads=9 lookahead_threads=1 sliced_threads=0 nr=0 decimate=1 interlaced=0 bluray_compat=0 constrained_intra=0 bframes=3 b_pyramid=2 b_adapt=1 b_bias=0 direct=1 weightb=1 open_gop=0 weightp=2 keyint=250 keyint_min=12 scenecut=40 intra_refresh=0 rc_lookahead=40 rc=crf mbtree=1 crf=23.0 qcomp=0.60 qpmin=0 qpmax=69 qpstep=4 ip_ratio=1.40 aq=1:1.00
  Output #0, mp4, to '/katalon/katalon/report/behat_2.mp4':
    Metadata:
      encoder         : Lavf56.40.101
      Stream #0:0: Video: h264 (libx264) ([33][0][0][0] / 0x0021), yuv444p, 1024x768, q=-1--1, 12 fps, 12288 tbn, 12 tbc
      Metadata:
        encoder         : Lavc56.60.100 libx264
  Stream mapping:
    Stream #0:0 -&gt; #0:0 (rawvideo (native) -&gt; h264 (libx264))
  Press [q] to stop, [?] for help
  Segmentation fault2 q=26.0 size=     548kB time=00:00:53.08 bitrate=  84.5kbits/s dup=1 drop=1033
  </code></pre>
  
  <p>My decision how to save video is send "q" keyword before the xvfb-run ends, but this is very  uncomfortable</p>