FFMPEG Recording Script

#!/bin/bash
# FFMPEG screen recording script
# Capable of recording with microphone input (optional)
# Compatible with Ubuntu 13.04 and the ffmpeg version in its repositories
#
# Author: Michael Koch (Emkay443) (m<DOT>koch<AT>emkay443<DOT>de)
# Version: 2013-08-31
# License: GNU General Public License v3 (http://www.gnu.de/documents/gpl-3.0.en.html)

###################
## CONFIGURATION ##
###################

# Number of threads that should be used (0: automatic)
threads=0

# Size and offset of your recording
area_size=1920x1080
offset_x=0
offset_y=0

# Microphone device name (pulse for PulseAudio, hw:0,0 or similar for ALSA)
mic_device=pulse

# Sound codec (should work with Ubuntu's ffmpeg automagically)
sound_codec=pcm_s16le

# Video codec (should work out of the box as well)
video_codec=libx264

# Franes per second, lower is faster (but more looks better)
fps=30

# File directory and name
file_dir=$HOME/Videos
file_date=$(date +%d%m%Y_%H.%M.%S)
video_file_extension="mov"
sound_file_extension="wav"
video_file_path="$file_dir/videocast_$file_date.$video_file_extension"
sound_file_path="$file_dir/soundcast_$file_date.$sound_file_extension"

# Sound recording command
# Example for PulseAudio: http://pastebin.com/MwMK3KUy
# This has to exist and function properly, otherwise the sound record feature won't work!
# Also, if your sound recording program/script uses something externally (like sox)
# which doesn't get killed properly by this script, change sound_record_util to that external program
# otherwise leave it the same as sound_record_cmd
sound_record_cmd="$HOME/bin/pulserecord"
sound_record_parameters="$sound_file_path"
sound_record_util="$sound_record_cmd"

# You need a newer version of ffmpeg to combine video and audio without losing the microphone track!
# Download the static version of ffmpeg from this site:
# http://ffmpeg.gusari.org/static/
# untar it (tar -xzvf) and move the binaries somewhere you can execute them from.
#
# If you downloaded a new, static version of ffmpeg, change the following variable to true
# to enable combining the sound and video after recording
# and change the path to your new, static ffmpeg binary file
ffmpeg_static_enabled=false
ffmpeg_static_path="$HOME/bin/ffmpeg_static"

#########################################################################################
# WARNING: You should be careful when changing any code below. Modify at your own risk! #
#########################################################################################

######################
## HELPER VARIABLES ##
######################

video_record_nomic_cmd="ffmpeg -f x11grab -r $fps -s $area_size -i :0.0+$offset_x,$offset_y -vcodec $video_codec -vpre lossless_ultrafast -threads $threads $video_file_path"
video_record_mic_cmd="ffmpeg -f alsa -i $mic_device -f x11grab -r $fps -s $area_size -i :0.0+$offset_x,$offset_y -acodec $sound_codec -vcodec $video_codec -vpre lossless_ultrafast -threads $threads $video_file_path"

##################
## MAIN PROGRAM ##
##################

# If running in a terminal window, don't use graphical dialogs
# else use zenity
if [ -t 0 ]; then
    echo "Stop recording with CTRL-C"
    echo "Record with microphone? [Y|n]"
    read ans
    case $ans in
        n|N)
            record_with_mic=false
            ;;
        *)
            record_with_mic=true
            ;;
    esac
    echo "Record with sound? [Y|n]"
    read ans
    case $ans in
        n|N)
            record_with_sound=false
            ;;
        *)
            record_with_sound=true
            ;;
    esac
    if $record_with_sound; then
        $sound_record_cmd $sound_record_parameters &
    fi
    if $record_with_mic; then
        $video_record_mic_cmd
    else
        $video_record_nomic_cmd
    fi
    if $record_with_sound; then
        sound_record_pid="$(pidof -s -x $(basename $sound_record_util))"
        if [ ! -z $sound_record_pid ]; then kill $sound_record_pid; fi
    fi
    if $ffmpeg_static_enabled; then
        echo "Combine sound and video file? [Y|n]"
        echo "This can take some time and CPU power!"
        read ans
        case $ans in
            n|N)
                ffmpeg_static_enabled=false # We have to do this for the text output, without adding another variable
                ;;
            *)
                tmp_video_file_path="/tmp/videocast_$file_date.$video_file_extension"
                $ffmpeg_static_path -i $video_file_path -i $sound_file_path -filter_complex amix=inputs=2:duration=first $tmp_video_file_path
                video_file_path="$file_dir/videocast_combined_$file_date.$video_file_extension"
                mv "$tmp_video_file_path" $video_file_path
                ;;
        esac
    fi
    echo "Done."
    echo "You can find your video at $video_file_path"
    if $record_with_sound && ! $ffmpeg_static_enabled; then
        echo "and your audio recording at $sound_file_path"
        echo "To combine them properly, use a video editor like OpenShot or Pitivi"
    fi
else
    if zenity --question --text "Record with microphone?" --title "Question"; then
        record_with_mic=true
    else
        record_with_mic=false
    fi
    if zenity --question --text "Record with sound?" --title "Question"; then
        record_with_sound=true
    else
        record_with_sound=false
    fi
    zenity --info --text "Stop recording with CTRL-C"

    if $record_with_mic; then
        if $record_with_sound; then
            xterm -e "($sound_record_cmd $sound_record_parameters &); $video_record_mic_cmd"
        else
            xterm -e "$video_record_mic_cmd"
        fi
    else
        if $record_with_sound; then
            xterm -e "($sound_record_cmd $sound_record_parameters &); $video_record_nomic_cmd"
        else
            xterm -e "$video_record_nomic_cmd"
        fi
    fi
    if $record_with_sound; then
        if $ffmpeg_static_enabled && zenity --question --text "Combine sound and video file?\n\nThis can take some time and CPU power!" --title "Question"; then
            tmp_video_file_path="/tmp/videocast_$file_date.$video_file_extension"
            xterm -e "$ffmpeg_static_path -i $video_file_path -i $sound_file_path -filter_complex amix=inputs=2:duration=first $tmp_video_file_path"
            video_file_path="$file_dir/videocast_combined_$file_date.$video_file_extension"
            mv "$tmp_video_file_path" "$video_file_path"
            zenity --info --text "Done.\nYou can find your video at $video_file_path" --title "Success"
        else
            zenity --info --text "Done.\nYou can find your video at $video_file_path\nand your audio recording at $sound_file_path\n\nTo combine them properly, use a video editor like OpenShot or Pitivi" --title "Success"
        fi
    else
        zenity --info --text "Done.\nYou can find your video at $video_file_path" --title "Success"
    fi
fi

exit 0