webm.sh

#!/bin/bash
#
# Author:       Twily           2014
# Description:  Records a window or the desktop and converts the video to webm format.
# Requires:     ffmpeg, xwininfo, libnotify, keybind (C-A-x) in your WM to "pkill -f 'x11grab'"
# Useage:       $ sh screencast -h|--help
#
# Make GIFs:    http://pastebin.com/ReNXZdGV

MODE="desktop"                  # Default "desktop" ["window"|"desktop"]
MARGIN=`expr 24 + 0`            # Margin in window mode (px) (+ 0 for border)
TITLEBAR=0                      # Titlebar height in window mode (px)
FPS=30                          # Frames Per Second [12-60]
PRESET="ultrafast"              # Default "ultrafast" (x264 --help for preset list)
CRF=10                          # Constant Rate Factor [0-51] (Lower is better quality)
QMAX=10                         # Maximum Quantization [1-31] (Lower is better quality)
FULLSCREEN="1920x1080"          # Set your desktop resolution
DISPLAY=":0.0"            # Set to record specific monitor 0.0 or 0.1?

OUTPUT="/home/neeasade/out.webm"
TMP="/home/neeasade/out_pre.mkv"
KEEP=false                      # Keep original mkv file after conversion [true|false]

if [ "$1" = "-h" ] || [ "$1" = "--help" ]; then
    echo -e "Useage: $ sh screencast [OPTIONS]\n"
    echo "  -h|--help               Display this help"
    echo "  -m|--mode desktop       Set mode [\"desktop\"|\"window\"]"
    echo "  -s|--space 10           Set margin in window mode (px)"
    echo "  -t|--title 24           Set titlebar height in window mode (px)"
    echo "  -f|--fps 30             Set Frames Per Second [12-60]"
    echo "  -c|--crf 10             Set Constant Rate Factor [0-51] (Lower is better quality)"
    echo "  -q|--qmax 10            Set Maximum Quantization [1-31] (Lower is better quality)"
    echo "  -p|--preset ultrafast   Set preset (x264 --help for preset list)"
    echo "  -k|--keep false         Keep original mkv file after conversion [true|false]"
    echo "  -o|--output file.webm   Output webm file"
    echo -e "\n"; exit 0
fi

OPTS=`getopt -o m:s:t:o:f:c:p:q:k: --long mode:,space:,title:,output:,fps:,crf:,preset:,qmax:,keep: -- "$@"`
eval set -- "$OPTS"

ERROR=0

while true; do
    case "$1" in
        -m|--mode)   MODE="$2";   shift 2;;  -s|--space)  MARGIN="$2"; shift 2;;
        -o|--output) OUTPUT="$2"; shift 2;;  -p|--preset) PRESET="$2"; shift 2;;
        -f|--fps)    FPS="$2";    shift 2;;  -c|--crf)    CRF="$2";    shift 2;;
        -q|--qmax)   QMAX="$2";   shift 2;;  -k|--keep)   KEEP=$2;     shift 2;;
        -t|--title)  TITLEBAR="$2" shift 2;;
        --)          shift; break;;          *) echo "Internal error!"; exit 1
    esac
done

if [ "$MODE" = "window" ]; then
    WINFO=$(xwininfo)

    WINX=$(($(echo $WINFO|grep -Po 'Absolute upper-left X: \K[^ ]*')-$MARGIN))
    WINY=$(($(echo $WINFO|grep -Po 'Absolute upper-left Y: \K[^ ]*')-$MARGIN-$TITLEBAR))
    WINW=$(($(echo $WINFO|grep -Po 'Width: \K[^ ]*')+($MARGIN*2)))
    WINH=$(($(echo $WINFO|grep -Po 'Height: \K[^ ]*')+($MARGIN*2+$TITLEBAR)))

    sleep 2 # Wait before recording begin
    notify-send "Window is now being recorded.\nStop by pressing Ctrl+Alt+X."

    # Record Window
    ffmpeg -f x11grab -s "$WINW"x"$WINH" -r $FPS -i $DISPLAY"+$WINX,$WINY" -c:v libx264 -preset $PRESET -crf $CRF -y "$TMP" #|| ERROR=1

    # With sound; see http://pastebin.com/qXWFS81k
    # ffmpeg -f alsa -ac 2 -i hw:1,1 -f x11grab -s "$WINW"x"$WINH" -r $FPS -i $DISPLAY"+$WINX,$WINY" -c:v libx264 -preset $PRESET -crf $CRF -y "$TMP" #|| ERROR=1
else
    sleep 2 # Wait before recording begin
    notify-send "Desktop is now being recorded.\nStop by pressing Ctrl+Alt+X."

    # Record Fullscreen
    ffmpeg -f x11grab -s $FULLSCREEN -r $FPS -i $DISPLAY -c:v libx264 -preset $PRESET -crf $CRF -y "$TMP" #|| ERROR=1

    # With sound; see http://pastebin.com/qXWFS81k
    # ffmpeg -f alsa -ac 2 -i hw:1,1 -f x11grab -s $FULLSCREEN -r $FPS -i $DISPLAY -c:v libx264 -preset $PRESET -crf $CRF -y "$TMP" #|| ERROR=1
fi
notify-send "Desktop is no longer being recorded.\nVideo is now being converted to webm."

# Convert Video: mkv -> webm
# ffmpeg -i out.mkv -c:v libvpx -qmin 1 -qmax 10 -preset ultrafast -c:a libvorbis out.webm
#ffmpeg -i "$TMP" -c:v libvpx -qmin 1 -qmax $QMAX -preset $PRESET -c:a libvorbis "$OUTPUT" || ERROR=1
#
# Improved MKV -> WEBM conversion by Ushibro
ffmpeg -y -i "$TMP" -c:v libvpx -qmin 1 -qmax $QMAX -an -threads 8 -slices 8 -auto-alt-ref 1 -lag-in-frames 16 -pass 1 -f webm /dev/null || ERROR=1
ffmpeg -i "$TMP" -c:v libvpx -qmin 1 -qmax $QMAX -an -threads 8 -slices 8 -auto-alt-ref 1 -lag-in-frames 16 -pass 2 "$OUTPUT" || ERROR=1
rm ffmpeg2pass*.log

if [ "$ERROR" -eq 0 ]; then
    if [[ -f "$TMP" && "$KEEP" = false ]]; then rm -f "$TMP"; fi

    echo -e "\n\n\033[0;32mRecording and Converting has finished and"\
        "\"\033[0;34m$OUTPUT\033[0;32m\" has been \033[1;32mSuccessfully created\033[0;32m.\033[0m\n\n";

    notify-send "Video was successfully converted to webm!\n\"$OUTPUT\"."
    exit 0
else
    echo -e "\n\n\033[0;31mAn unexpected Error prevented the screen recorder to complete,"\
        "screencast was \033[1;31mNot converted\033[0;31m.\033[1;30m\n(Attempting to keep all data recorded in \"$TMP\")\033[0m\n\n";

    notify-send "An unexpected error prevented the video conversion to complete."
    exit 1
fi