"codito ergo sum"

Prerequisites

• FFMPEG
• libx264
• alsa

Usage

Execute the script (in a terminal console), click at the window to capture, record your action and press q to finish.

You can adjust ffmpeg's parameters like framerate, codecs and audio-device.

Script

screencapture.sh

             1 #!/bin/bash
 2 XWINFO=`xwininfo | grep -e Width -e Height -e Absolute`
 3 X=`echo $XWINFO | grep -e "Absolute upper-left X:" | cut -d ':' -f 2 | cut -d ' ' -f 2`
 4 Y=`echo $XWINFO | grep -e "Absolute upper-left X:" | cut -d ':' -f 3 | cut -d ' ' -f 2`
 5 W=`echo $XWINFO | grep -e "Absolute upper-left X:" | cut -d ':' -f 4 | cut -d ' ' -f 2`
 6 H=`echo $XWINFO | grep -e "Absolute upper-left X:" | cut -d ':' -f 5 | cut -d ' ' -f 2`
 7 
 8 #ensure odd numbers
 9 if [ $(( $W % 2 )) -eq 1 ]
10 then
11   W=$(($W+1))
12 fi
13 
14 if [ $(( $H % 2 )) -eq 1 ]
15 then
16   H=$(($H+1))
17 fi
18 
19 #capture screen content and sound
20 ffmpeg                                                                                          \
21     -f alsa -ac 2 -i hw:0,0 -acodec pcm_s16le                                                   \
22     -f x11grab -r 15 -s ${W}x${H} -i :0.0+${X},${Y} -vcodec libx264 -vpre lossless_ultrafast \
23     -threads 3                                                                                  \
24     screencapture.mkv
25 
26 #convert
27 ffmpeg                                                                                          \
28     -acodec libmp3lame -ab 96k -ac 2                                                            \
29     -vcodec libx264 -vpre slow -crf 22                                                      \
30     -threads 3                                                                                  \
31     -i screencapture.mkv screencapture.mp4
32 
33 #clean-up   
34 rm -f screencapture.mkv