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

   1 #!/bin/bash
   2 # WARNING: This is a terribly dirty and messy shellscript, written over a couple of late nights.
   3 # There was alcohol …
   4 # You probably need to install all the gstreamer-plugins (at least -ugly and -ffmpeg) to get this
   5 # to work. I wanted to make mp4 with x264, I didn't bother with free codecs.
   6 #
   7 # So this script allows you to create screencasts on Linux, with optional sound inputs (both Mic
   8 # and system sounds). It stores system sounds and mic in separate audio streams.
   9 # You also get to choose to record from the whole screen or just a specified window. It has only
  10 # been tested on Fedora 18.
  11 #
  12 # It dumps the recording in your $HOME directory with filename screencast-YYYY-MM-DD-HH-MM-SS.mp4
  13 #
  14 # Written by Einar Jørgen Haraldseid (http://einar.slaskete.net)
  15 # License: http://sam.zoy.org/wtfpl/COPYING
  16
  17 # Get device names and pretty names for playback sinks:
  18 PLAYSINKLIST=$(pacmd list-sinks | grep -e "name: " -e "device.description = " | cut -d " " -f "2-" | sed -e "s/name: \|= //g" -e "s/<\|>\|\x22//g")
  19
  20 # Display playback monitor chooser
  21 PLAYMON=$(echo "${PLAYSINKLIST}
  22 none
  23 Don't capture system sounds" | zenity --list --title "Choose Output Device" --text "Choose a sound device to capture system sound from:" --column "device" --column "Name" --print-column=1 --hide-column=1 2>/dev/null)
  24
  25 if [ -z ${PLAYMON} ]; then
  26   echo "No choice made on output device, assuming cancel."
  27   exit 1
  28 fi
  29
  30 if [ ${PLAYMON} != "none" ]; then
  31   # Unmute monitor of the playback sink (if set):
  32   PLAYMON="${PLAYMON}.monitor"
  33
  34   pacmd set-source-mute ${PLAYMON} false >/dev/null
  35 fi
  36
  37 # Get device names and pretty names for microphones:
  38 MICLIST=$(pacmd list-sources | grep -e "name: " -e "device.description = " | grep -v -i "monitor" | cut -d " " -f "2-" | sed -e "s/name: \|= //g" -e "s/<\|>\|\x22//g")
  39
  40 # Display device chooser
  41 MIC=$(echo "${MICLIST}
  42 none
  43 Don't use a microphone" | zenity --list --title "Choose Microphone" --text "Choose a microphone to capture voice from:" --column "device" --column "Name" --print-column=1 --hide-column=1 2>/dev/null)
  44
  45 if [ -z ${MIC} ]; then
  46   echo "No choice made on microphone, assuming cancel."
  47   exit 1
  48 fi
  49
  50 # Get target window for recording:
  51 TARGET=$(echo "root
  52 Whole screen
  53 window
  54 Specific window" | zenity --list --title "Choose recording mode" --text "Do you want to record the whole screen, or record a specific window?" --column "target" --column "Mode" --print-column=1 --hide-column=1 2>/dev/null)
  55
  56 if [ -z ${TARGET} ]; then
  57   echo "No choice for recording target, assuming cancel."
  58   exit 1
  59 fi
  60
  61 if [ ${TARGET} = "root" ]; then
  62   echo "Root chosen"
  63   XWININFO=$(xwininfo -root)
  64 else
  65   echo "custom chosen"
  66   XWININFO=$(xwininfo)
  67 fi
  68
  69 # Get Window ID and dimensions, make sure dimensions are divisible by two, or else the encoder will fail
  70 WID=$(echo "${XWININFO}" | grep "Window id:" | awk '{print $4}')
  71 WIDTH=$(echo "${XWININFO}" | grep "Width: " | cut -d ":" -f 2 | awk '{print $1+$1%2}')
  72 HEIGHT=$(echo "${XWININFO}" | grep "Height: " | cut -d ":" -f 2 | awk '{print $1+$1%2}')
  73
  74 # Calculate a suitable bitrate based on window dimensions
  75 BITRATE=$(echo "${WIDTH} * ${HEIGHT} * 0.006" | bc | cut -d "." -f 1 )
  76
  77 # Set file name.
  78 FILENAME="screencast-$(date +%F-%H-%M-%S).mp4"
  79
  80 # Enable inputs as suitable
  81 if [ ${PLAYMON} != "none" ]; then
  82   MONITORARG="pulsesrc device=${PLAYMON} slave-method=0 provide-clock=false ! audiorate ! audioconvert ! ffenc_aac bitrate=256000 ! queue2 ! mux."
  83 fi
  84 if [ ${MIC} != "none" ]; then
  85   MICARG="pulsesrc device=${MIC} slave-method=0 provide-clock=false ! audiorate ! audioconvert ! ffenc_aac bitrate=256000 ! queue2 ! mux."
  86 fi
  87
  88 # Launch gstreamer
  89 gst-launch -e ximagesrc xid="${WID}" do-timestamp=1 use-damage=0 ! video/x-raw-rgb,framerate=30/1 \
  90  ! ffmpegcolorspace ! videoscale method=0 ! video/x-raw-yuv,width=${WIDTH},height=${HEIGHT} \
  91  ! x264enc speed-preset=ultrafast bitrate=${BITRATE} ! queue2 \
  92  ! mp4mux name="mux" ! filesink location="${HOME}/${FILENAME}" $MONITORARG $MICARG
  93