ffprogress - runs custom ffmpeg command line & turns it's output into a progress bar.

#####################################################################################################################
# ffprogress v1.12 - turns ffmpeg output into a simple progress bar                                                 #
# Handshake:                                                                                                        #
# $FF_LOG contains the path & name of the log file (default: "/media/ramdisk/log")                                  #
# $FF_CMD contains the path & name of the script with the ffmpeg command line (default: "/media/ramdisk/cmd")       #
# $FF_INPARAMS contains the input parameters (default: none)                                                        #
# $FF_INPUT contains the input path and file name (default: none)                                                   #
# $FF_OUTPUT contains the output path and file name (default: "/dev/null")                                          #
# $FF_ARGS contains additional arguments passed to ffmpeg (default: none)                                           #
# The input file name is mandatory, output is optional. FF_ARGS must contain the remaining ffmpeg command line.     #
#####################################################################################################################

. progress.sh

FF_LOG=/media/ramdisk/log_$(date +%y%m%d%H%M%S%3N)
FF_CMD=/media/ramdisk/cmd_$(date +%y%m%d%H%M%S%3N)
FF_OUTPUT=/dev/null
FF_TIME_PAST=0
PROGRESS_R1=" "
PROGRESS_FT=S
PROGRESS_TC=5

FF_PROGRESS(){
    if [ -z "$FF_INPUT" -o ! -e "$FF_INPUT" ]; then
        FF_ERROR="wrong input path or file name."
        return 1
    elif [ "$FF_OUTPUT" != /dev/null -a -e "$FF_OUTPUT" ]; then
        read -r -p "Output file already exists. Overwrite (y/N)? " OPT
        case $OPT in
            y|Y)
                FF_ARGS="$FF_ARGS -y"
                ;;
            *)
                FF_ERROR="output flile already exists and won't be replaced."
                return 1
                ;;
        esac
    fi
    printf "Starting ffmpeg...\r"
    echo "ffmpeg $FF_INPARAMS -i \"$FF_INPUT\" $FF_ARGS \"$FF_OUTPUT\" 2>> $FF_LOG" > $FF_CMD
    chmod +x $FF_CMD
    $FF_CMD &

    while ! grep -qs Duration $FF_LOG; do sleep 0.2s; done
    PROGRESS_MAX1=$(grep "Duration:" $FF_LOG | awk -F '[:.]' '{print ($2*3600)+($3*60)+$4}')
    [ -n "$VIDEO_LIMIT" ] && PROGRESS_MAX1=$(($VIDEO_LIMIT*100/$(grep -m1 " fps," $FF_LOG | awk -F " fps," '{print $1}' | awk -F "[, .]" '{print $(NF-1)$NF}')))
    grep "Duration:" $FF_LOG | awk -F '[, ]' '{printf $3" "$4}'
    printf " Processing $PROGRESS_MAX1 seconds of the video...\n"
    while [ -n "$(ps -e | grep ffmpeg)" ]; do
        FF_TIME_CUR=$(grep -Eo 'time=[0-9]+:[0-9]+:[0-9]+' $FF_LOG | tail -n1 | awk -F '[=:]' '{print ($2*3600)+($3*60)+$4}')
        if [ -n "$FF_TIME_CUR" ] && [ $FF_TIME_CUR -ne $FF_TIME_PAST ]; then
            PROGRESS_BAR $FF_TIME_CUR
            sleep 0.1s
            FF_TIME_PAST=$FF_TIME_CUR
        fi
    done
    PROGRESS_BAR $PROGRESS_MAX1
}