#----------------------Script ---------------------------------
#Get file name
read -e -p "Enter the path and name of file with out extension e.g. ~/video NOT ~/video.mp4 : " NAME
INFO=$(xwininfo -frame)

#get window size
WIN_GEO=$(echo $INFO | grep -oEe 'geometry [0-9]+x[0-9]+' |\
grep -oEe '[0-9]+x[0-9]+')

#get window offset
WIN_XY=$(echo $INFO | grep -oEe 'Corners:\s+\+[0-9]+\+[0-9]+' |\
grep -oEe '[0-9]+\+[0-9]+' | sed -e 's/+/,/' )

#capture and encode video (luminance chrominance) upscaled twice to avoid subsampling issues due to colorspace conversion

ffmpeg -f x11grab -y -r 24 -s $WIN_GEO \
-i :0.0+$WIN_XY -pix_fmt yuv420p -vf scale=w=2*iw:h=2*ih -sws_flags neighbor+full_chroma_inp+full_chroma_int \
-vcodec libx264 -crf 18 $NAME.mp4


#--------------------------------
    ffmpeg version 2.1.4 Copyright (c) 2000-2014 the FFmpeg developers
      built on Mar 14 2014 23:46:10 with gcc 4.8 (SUSE Linux)
      configuration: --shlibdir=/usr/lib64 --prefix=/usr --mandir=/usr/share/man --libdir=/usr/lib64 --enable-shared --disable-static --enable-debug --disable-stripping --extra-cflags='-fmessage-length=0 -grecord-gcc-switches -fstack-protector -O2 -Wall -D_FORTIFY_SOURCE=2 -funwind-tables -fasynchronous-unwind-tables -g -fPIC -I/usr/include/gsm' --enable-gpl --enable-x11grab --enable-version3 --enable-pthreads --enable-avfilter --enable-libpulse --enable-libvpx --enable-libopus --enable-libass --enable-libmp3lame --enable-libvorbis --enable-libtheora --enable-libspeex --enable-libxvid --enable-libx264 --enable-libschroedinger --enable-libgsm --enable-libopencore-amrnb --enable-libopencore-amrwb --enable-postproc --enable-libdc1394 --enable-librtmp --enable-libfreetype --enable-avresample --enable-libtwolame --enable-libvo-aacenc --enable-gnutls
      libavutil      52. 48.101 / 52. 48.101
      libavcodec     55. 39.101 / 55. 39.101
      libavformat    55. 19.104 / 55. 19.104
      libavdevice    55.  5.100 / 55.  5.100
      libavfilter     3. 90.100 /  3. 90.100
      libavresample   1.  1.  0 /  1.  1.  0
      libswscale      2.  5.101 /  2.  5.101
      libswresample   0. 17.104 /  0. 17.104
      libpostproc    52.  3.100 / 52.  3.100
    [x11grab @ 0x15a9680] device: :0.0+263,92 -> display: :0.0 x: 263 y: 92 width: 1672 height: 917
    [x11grab @ 0x15a9680] shared memory extension found
    X Error of failed request:  BadMatch (invalid parameter attributes)
      Major opcode of failed request:  131 (MIT-SHM)
      Minor opcode of failed request:  4 (X_ShmGetImage)
      Serial number of failed request:  11
      Current serial number in output stream:  11