git.slaskete.net - einar-bin/blob - screencast-vp8.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 #
   6 # Further tweaks and porting to free codecs done one early Saturday morning
   7 # in May. There was no coffee … and very little experience with vp8
   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 # It dumps the recording in your $HOME directory with a filename like
  14 # screencast-YYYY-MM-DD-HH-MM-SS.mp4
  15 #
  16 # Written by Einar Jørgen Haraldseid (http://einar.slaskete.net)
  17 # License: http://sam.zoy.org/wtfpl/COPYING
  18
  19 # Get device names and pretty names for enumerating playback sinks:
  20 PLAYSINKLIST=$(pacmd list-sinks | \
  21  grep -e "name: " -e "device.description = " | cut -d " " -f "2-" | \
  22  sed -e "s/name: \|= //g" -e "s/<\|>\|\x22//g")
  23
  24 # Display playback monitor chooser
  25 PLAYMON=$(echo "${PLAYSINKLIST}
  26 none
  27 Don't capture system sounds" | \
  28  zenity --list --title "Choose Output Device" \
  29  --text "Choose a sound device to capture system sound from:" \
  30  --column "device" --column "Name" --print-column=1 \
  31  --hide-column=1 2>/dev/null)
  32
  33 # Catch cancel
  34 if [ -z ${PLAYMON} ]; then
  35   echo "No choice made on output device, assuming cancel."
  36   exit 1
  37 fi
  38
  39 if [ ${PLAYMON} != "none" ]; then
  40   # Unmute monitor of the playback sink (if set):
  41   PLAYMON="${PLAYMON}.monitor"
  42   pacmd set-source-mute ${PLAYMON} false >/dev/null
  43   echo "Recording system sounds from ${PLAYMON}"
  44 else
  45   echo "Not recording system sounds."
  46 fi
  47
  48 # Get device names and pretty names for microphones:
  49 MICLIST=$(pacmd list-sources | \
  50  grep -e "name: " -e "device.description = " | \
  51  grep -v -i "monitor" | cut -d " " -f "2-" | \
  52  sed -e "s/name: \|= //g" -e "s/<\|>\|\x22//g")
  53
  54 # Display device chooser
  55 MIC=$(echo "${MICLIST}
  56 none
  57 Don't use a microphone" | \
  58  zenity --list --title "Choose Microphone" \
  59  --text "Choose a microphone to capture voice from:" \
  60  --column "device" --column "Name" --print-column=1 \
  61  --hide-column=1 2>/dev/null)
  62
  63 if [ -z ${MIC} ]; then
  64   echo "No choice made on microphone, assuming cancel."
  65   exit 1
  66 fi
  67
  68 if [ ${MIC} != "none" ]; then
  69   echo "Recording voice from ${MIC}"
  70 else
  71   echo "Not recording voice."
  72 fi
  73
  74 # Get target window for recording:
  75 TARGET=$(echo "root
  76 Whole screen
  77 window
  78 Specific window" | \
  79  zenity --list --title "Choose recording mode" \
  80  --text "Do you want to record the whole screen,\
  81  or record a specific window?" --column "target" \
  82  --column "Mode" --print-column=1 --hide-column=1 2>/dev/null)
  83
  84 if [ -z ${TARGET} ]; then
  85   echo "No choice for recording target, assuming cancel."
  86   exit 1
  87 fi
  88
  89 if [ ${TARGET} = "root" ]; then
  90   echo "Root window chosen."
  91   XWININFO=$(xwininfo -root)
  92 else
  93   echo "Custom window chosen."
  94   XWININFO=$(xwininfo)
  95 fi
  96
  97 # Get Window ID and dimensions, make sure X and Y dimensions are
  98 # divisible by two, or else the encoder might fail
  99 WID=$(echo "${XWININFO}" | grep "Window id:" | awk '{print $4}')
 100 WIDTH=$(echo "${XWININFO}" | grep "Width: " | \
 101  cut -d ":" -f 2 | awk '{print $1+$1%2}')
 102 HEIGHT=$(echo "${XWININFO}" | grep "Height: " | \
 103  cut -d ":" -f 2 | awk '{print $1+$1%2}')
 104
 105 # Calculate a suitable bitrate based on window dimensions
 106 BITRATE=$(echo "${WIDTH} * ${HEIGHT} * 0.85" | bc | cut -d "." -f 1 )
 107
 108 # Set file name.
 109 FILENAME="screencast-$(date +%F-%H-%M-%S).webm"
 110
 111 # Enable inputs as suitable
 112 if [ ${PLAYMON} != "none" ]; then
 113   MONITORARG="pulsesrc device=${PLAYMON} slave-method=0 provide-clock=false \
 114    ! audiorate ! audioconvert ! vorbisenc ! queue2 ! mux."
 115 fi
 116 if [ ${MIC} != "none" ]; then
 117   MICARG="pulsesrc device=${MIC} slave-method=0 provide-clock=false \
 118    ! audiorate ! audioconvert ! vorbisenc ! queue2 ! mux."
 119 fi
 120
 121 # Launch gstreamer
 122 gst-launch-1.0 -q -e ximagesrc xid="${WID}" do-timestamp=1 use-damage=0 \
 123  ! video/x-raw,framerate=20/1 ! videoscale method=0 \
 124  ! video/x-raw,width=${WIDTH},height=${HEIGHT} ! videoconvert \
 125  ! vp8enc end-usage=vbr cpu-used=16 target-bitrate=${BITRATE} \
 126     deadline=100 static-threshold=1000 min-quantizer=0 max-quantizer=63 ! queue2 \
 127  ! webmmux name="mux" \
 128  ! filesink location="${HOME}/${FILENAME}" ${MONITORARG} ${MICARG}
 129
 130 echo "Recording done, file is ${FILENAME}"