git.slaskete.net - einar-bin/blob - screencast.sh

   1 #!/bin/bash
   2
   3 # WARNING: This is a terribly dirty and messy shellscript, written over a
   4 # couple of late nights. There was alcohol …
   5 # You probably need to install all the gstreamer-plugins (at least -ugly
   6 # and -ffmpeg) as well as gstreamer-tools to get this to work. I wanted to
   7 # make mp4 files with x264, I didn't bother with free codecs.
   8 #
   9 # So this script allows you to create screencasts on Linux, with optional
  10 # sound inputs (both Microphone and system sounds). It stores system sounds
  11 # and microphone in separate audio streams.
  12 #
  13 # You also get to choose to record from the whole screen or just a specified
  14 # window. It has been tested on Fedora 18, Ubuntu 13.04 and CrunchBang Waldorf
  15 # (and thus should work on Debian Wheezy as well).
  16 #
  17 # It dumps the recording in your $HOME directory with a filename like
  18 # screencast-YYYY-MM-DD-HH-MM-SS.mp4
  19 #
  20 # Written by Einar Jørgen Haraldseid (http://einar.slaskete.net)
  21 # License: http://sam.zoy.org/wtfpl/COPYING
  22
  23 # Get device names and pretty names for enumerating playback sinks:
  24 PLAYSINKLIST=$(pacmd list-sinks | \
  25  grep -e "name: " -e "device.description = " | cut -d " " -f "2-" | \
  26  sed -e "s/name: \|= //g" -e "s/<\|>\|\x22//g")
  27
  28 # Display playback monitor chooser
  29 PLAYMON=$(echo "${PLAYSINKLIST}
  30 none
  31 Don't capture system sounds" | \
  32  zenity --list --title "Choose Output Device" \
  33  --text "Choose a sound device to capture system sound from:" \
  34  --column "device" --column "Name" --print-column=1 \
  35  --hide-column=1 2>/dev/null)
  36
  37 # Catch cancel
  38 if [ -z ${PLAYMON} ]; then
  39   echo "No choice made on output device, assuming cancel."
  40   exit 1
  41 fi
  42
  43 if [ ${PLAYMON} != "none" ]; then
  44   # Unmute monitor of the playback sink (if set):
  45   PLAYMON="${PLAYMON}.monitor"
  46   pacmd set-source-mute ${PLAYMON} false >/dev/null
  47   echo "Recording system sounds from ${PLAYMON}"
  48 else
  49   echo "Not recording system sounds."
  50 fi
  51
  52 # Get device names and pretty names for microphones:
  53 MICLIST=$(pacmd list-sources | \
  54  grep -e "name: " -e "device.description = " | \
  55  grep -v -i "monitor" | cut -d " " -f "2-" | \
  56  sed -e "s/name: \|= //g" -e "s/<\|>\|\x22//g")
  57
  58 # Display device chooser
  59 MIC=$(echo "${MICLIST}
  60 none
  61 Don't use a microphone" | \
  62  zenity --list --title "Choose Microphone" \
  63  --text "Choose a microphone to capture voice from:" \
  64  --column "device" --column "Name" --print-column=1 \
  65  --hide-column=1 2>/dev/null)
  66
  67 if [ -z ${MIC} ]; then
  68   echo "No choice made on microphone, assuming cancel."
  69   exit 1
  70 fi
  71
  72 if [ ${MIC} != "none" ]; then
  73   echo "Recording voice from ${MIC}"
  74 else
  75   echo "Not recording voice."
  76 fi
  77
  78 # Get target window for recording:
  79 TARGET=$(echo "root
  80 Whole screen
  81 window
  82 Specific window" | \
  83  zenity --list --title "Choose recording mode" \
  84  --text "Do you want to record the whole screen,\
  85  or record a specific window?" --column "target" \
  86  --column "Mode" --print-column=1 --hide-column=1 2>/dev/null)
  87
  88 if [ -z ${TARGET} ]; then
  89   echo "No choice for recording target, assuming cancel."
  90   exit 1
  91 fi
  92
  93 if [ ${TARGET} = "root" ]; then
  94   echo "Root window chosen."
  95   XWININFO=$(xwininfo -root)
  96 else
  97   echo "Custom window chosen."
  98   XWININFO=$(xwininfo)
  99 fi
 100
 101 # Get Window ID and dimensions, make sure X and Y dimensions are
 102 # divisible by two, or else the encoder will fail
 103 WID=$(echo "${XWININFO}" | grep "Window id:" | awk '{print $4}')
 104 WIDTH=$(echo "${XWININFO}" | grep "Width: " | \
 105  cut -d ":" -f 2 | awk '{print $1+$1%2}')
 106 HEIGHT=$(echo "${XWININFO}" | grep "Height: " | \
 107  cut -d ":" -f 2 | awk '{print $1+$1%2}')
 108
 109 # Calculate a suitable bitrate based on window dimensions
 110 BITRATE=$(echo "${WIDTH} * ${HEIGHT} * 0.0075" | bc | cut -d "." -f 1 )
 111
 112 # Set file name.
 113 FILENAME="screencast-$(date +%F-%H-%M-%S).mp4"
 114
 115 # Determine if we have ffenc_aac or avenc_aac available
 116 AACENC="ffenc_aac"
 117 if gst-inspect-1.0 --exists avenc_aac; then
 118   AACENC="avenc_aac"
 119 fi
 120
 121 # Enable inputs as suitable
 122 if [ ${PLAYMON} != "none" ]; then
 123   MONITORARG="pulsesrc device=${PLAYMON} slave-method=0 provide-clock=false \
 124    ! audiorate ! audioconvert ! ${AACENC} bitrate=256000 ! queue2 ! mux."
 125 fi
 126 if [ ${MIC} != "none" ]; then
 127   MICARG="pulsesrc device=${MIC} slave-method=0 provide-clock=false \
 128    ! audiorate ! audioconvert ! ${AACENC} bitrate=256000 ! queue2 ! mux."
 129 fi
 130
 131 # Launch gstreamer
 132 gst-launch-1.0 -q -e ximagesrc xid="${WID}" do-timestamp=1 use-damage=0 \
 133  ! video/x-raw,framerate=30/1 ! videoscale method=0 \
 134  ! video/x-raw,width=${WIDTH},height=${HEIGHT} ! videoconvert \
 135  ! x264enc speed-preset=veryfast bitrate=${BITRATE} ! queue2 \
 136  ! mp4mux name="mux" \
 137  ! filesink location="${HOME}/${FILENAME}" ${MONITORARG} ${MICARG}
 138
 139 echo "Recording done, file is ${FILENAME}"