first-commit

screencast.sh

@@ -0,0 +1,154 @@
+#!/bin/bash
+
+# Original script is from http://okiebuntu.homelinux.com/blog/?p=175
+# Modifications by brousch (Ben Rousch, brousch@gmail.com):
+#     Upped it to 30 FPS capture
+#     Added OpenShot-preferred codecs output section (mp4/mpeg4/faac)
+
+# list of programs we depend on
+progs="xdpyinfo grep head sed ffmpeg pacat parec sox"
+
+# check for programs we depend on
+result=0
+for prog in $progs
+do
+  type -p $prog > /dev/null
+  if (( $? != 0 )); then
+    echo "Error: Cannot find required program '$prog'"
+    result=1
+  fi
+done
+if (( $result != 0 )); then
+  exit 1
+fi
+
+screenSize="640x480" # default if we cant detect it
+screenOffset="0,0" # default to top-left corner
+frameRate="30" # default frame rate
+baseName="capture" # default base filename for capture
+
+# attempt to detect the dimension of the screen for the default
+dimensions=`xdpyinfo | grep 'dimensions:' | head -1 | \
+  sed -e 's/^.* \([0-9]\+x[0-9]\+\) pixels.*$/\1/'`
+if [[ "$dimensions" =~ [0-9]+x[0-9]+ ]]; then
+  screenSize=$dimensions
+fi
+
+# collect command line settings
+while getopts 'hs:o:t:p' param ; do
+  case $param in
+    s)
+      screenSize="$OPTARG"
+      ;;
+    o)
+      screenOffset="$OPTARG"
+      ;;
+    t)
+      timeToRecord="$OPTARG"
+      ;;
+    *)
+      echo ""
+      echo "$0 - records screencast"
+      echo ""
+      echo "$0 [options] [base-filename]"
+      echo ""
+      echo "options:"
+      echo "	-h            show brief help"
+      echo "	-s <size>     screensize to record as <width>x<height>"
+      echo "	-o <offset>   offset off recording area as <xoffset>,<yoffset>"
+      echo "	-t <time>     time to record (in seconds)"
+      echo ""
+      exit 0
+      ;;
+  esac
+done
+
+shift $(( $OPTIND - 1 ))
+
+# determine basename of files
+if [ -n "$1" ] ; then
+  baseName="$1"
+fi
+
+echo ""
+echo "Size = $screenSize"
+echo "Offset = $screenOffset"
+echo "Rate = $frameRate"
+echo "Filename = $baseName"
+
+# get ready to start recording
+echo ""
+if [ -n "$timeToRecord" ]; then
+  echo "Preparing to capture for $timeToRecord seconds."
+else
+  echo "Preparing to capture."
+  echo "Press ENTER when finished capturing."
+fi
+sleep 3
+echo ""
+
+# start playing silence to make sure there is always audio flowing
+pacat /dev/zero &
+pidSilence=$!
+
+# starts recording video using x11grab to make mpeg2video
+ffmpeg -y -an \
+  -s "$screenSize" -r "$frameRate" -f x11grab -i :0.0+"$screenOffset" \
+  -s "$screenSize" -r "$frameRate" -aspect 4:3 -vcodec mpeg2video -sameq \
+  -f mpeg2video "$baseName.mpeg" &
+pidVideo=$!
+
+# starts recording raw audio
+parec --format=s16le --rate=44100 --channels=2 $baseName.raw &
+pidAudio=$!
+
+echo ""
+echo "Video recording started with process ID $pidVideo"
+echo "Audio recording started with process ID $pidAudio"
+echo ""
+
+# wait for recording to be done, either by timer or user hitting enter
+if [ -n "$timeToRecord" ]; then
+  sleep "$timeToRecord"
+else
+  read nothing
+fi
+
+# stop recordings
+echo ""
+echo "Terminating recordings ..."
+kill -15 $pidVideo $pidAudio 
+kill -15 $pidSilence
+wait
+
+# filter and normalize the audio
+echo "" 
+echo "Filtering and normalizing sound ..." 
+sox --norm -s -b 16 -L -r 44100 -c 2 "$baseName.raw" "$baseName.wav"  highpass 65 lowpass 12k
+
+# encode video and audio into avi file
+#echo "" 
+#echo "Encoding to final avi ..." 
+#ffmpeg -isync -i "$baseName.wav" -i "$baseName.mpeg" -acodec mp2 -ab 192k -vcodec copy "$baseName.avi"
+
+# convert to ogg - to turn on uncomment next three lines
+#echo""
+#echo "convert to theora"
+#ffmpeg2theora "$baseName.avi" -o "$baseName.ogv"
+
+# convert avi to flv - to turn on uncomment next three lines
+#echo""
+#echo "convert to theora"
+# ffmpeg -i "$baseNamee.avi" -ab 56 -ar 44100 -b 200 -r 15 -s 320x240 -f flv  "$baseNamee.flv"
+
+# convert video and audio to mp4 with mpeg4 video and libfaac audio
+echo ""
+echo "Encoding to final mp4 with MPEG4 and FAAC ..."
+ffmpeg -isync -i "$baseName.wav" -i "$baseName.mpeg" -acodec libfaac -ab 192k -vcodec mpeg4 -sameq "$baseName.mp4"
+
+echo ""
+echo "DONE! Final media written in file $baseName.mp4"
+
+echo ""
+exit 0
+