ff

#! /bin/bash

threads=5
quiet=1

function sanitize_file_name {
    echo -n "$1" | perl -pe 's/[\?\[\]\/\\=<>:'"'"';,"&\$#*()|~`!{}%+]//g;' -pe 's/[\r\n\t -]+/_/g;'
}

stty -echoctl # hide ^C

ffmpeg_path="/usr/local/ffmpeg/bin/"

printf '%q\n' * | while IFS= read filename ; do
    if [ -f "$filename" ]; then
        if [[ "$filename" =~ .*"__2.hw.mkv" ]]; then
            echo "INF: already converted file, ignoring: (${filename})"
        else
            filename_sanitized=$(sanitize_file_name "$filename")
            if [ "$filename" != "$filename_sanitized" ]; then
                echo 'INF: sanitizing filename to '"$filename_sanitized"
                mv "$filename" "$filename_sanitized" 2>/dev/null
            fi

            # get duration in seconds
            video_duration_secs=$("$ffmpeg_path"/ffprobe './'"$filename_sanitized" -show_entries format=duration -v quiet -of csv="p=0" 2> /dev/null)

            # check for strange fps
            "$ffmpeg_path"/ffprobe './'"$filename_sanitized" 2>&1|grep '59.95 fps' > /dev/null
            res=$?
            echo "INF: converting ${filename_sanitized} ..."
            if [ $res -eq 0 ]; then
                :
                if [ "$quiet""x" == "1x" ]; then
                    nice "$ffmpeg_path"/ffmpeg -nostdin \
                    -y -threads "$threads" -i './'"$filename_sanitized" \
                    -vcodec h264_nvenc -coder cabac -preset:v p1 -cq 36 -rc vbr \
                    -filter:v fps=fps=30 \
                    -c:a aac -sn './'"$filename_sanitized"'__2.hw.mkv' > /dev/null 2>&1
                else
                    nice "$ffmpeg_path"/ffmpeg -nostdin \
                    -y -threads "$threads" -i './'"$filename_sanitized" \
                    -vcodec h264_nvenc -coder cabac -preset:v p1 -cq 36 -rc vbr \
                    -filter:v fps=fps=30 \
                    -c:a aac -sn './'"$filename_sanitized"'__2.hw.mkv'
                fi
            else
                :
                if [ "$quiet""x" == "1x" ]; then
                    nice "$ffmpeg_path"/ffmpeg -nostdin \
                    -y -threads "$threads" -i './'"$filename_sanitized" \
                    -vcodec h264_nvenc -coder cabac -preset:v p1 -cq 36 -rc vbr \
                    -c:a aac -sn './'"$filename_sanitized"'__2.hw.mkv' > /dev/null 2>&1
                else
                    nice "$ffmpeg_path"/ffmpeg -nostdin \
                    -y -threads "$threads" -i './'"$filename_sanitized" \
                    -vcodec h264_nvenc -coder cabac -preset:v p1 -cq 36 -rc vbr \
                    -c:a aac -sn './'"$filename_sanitized"'__2.hw.mkv'
                fi
            fi
            # keep timestamp of the original file
            touch -r './'"$filename_sanitized" './'"$filename_sanitized"'__2.hw.mkv' >/dev/null 2>/dev/null

            # get duration in seconds of converted file
            video_duration_secs_conv=$("$ffmpeg_path"/ffprobe './'"$filename_sanitized"'__2.hw.mkv' -show_entries format=duration -v quiet -of csv="p=0" 2> /dev/null)
            echo "INF: secs orig: ${video_duration_secs} -> secs conv: ${video_duration_secs_conv}"

            if [ "$video_duration_secs""x" = "x" ]; then
                rm -f './'"$filename_sanitized"'__2.hw.mkv' >/dev/null 2>/dev/null
                echo "ERR: orig video duration unknown (${filename_sanitized})"
            elif [ "$video_duration_secs""x" = "0x" ]; then
                rm -f './'"$filename_sanitized"'__2.hw.mkv' >/dev/null 2>/dev/null
                echo "ERR: orig video duration zero (${filename_sanitized})"
           else
                duration_ok=$(echo "($video_duration_secs / 1) <= ($video_duration_secs_conv / 1)" 2>/dev/null|bc 2>/dev/null)
                if [ "$duration_ok""x" == "1x" ]; then
                    # size_orig=$(stat -c '%s' "$filename")
                    size_conv=$(stat -c '%s' "$filename_sanitized")
                    echo "INF: filesize : ${size_conv} (${filename_sanitized})"
                    err1=$(echo "scale=3; $size_conv > 2000000.0" 2>/dev/null| bc 2>/dev/null)
                    if [ "$err1""x" == "x" ]; then
                        rm -f './'"$filename_sanitized"'__2.hw.mkv' >/dev/null 2>/dev/null
                        echo "ERR: --- (${filename_sanitized})"
                    elif [ "$err1""x" == "1x" ]; then
                        rm -f "$filename_sanitized" >/dev/null 2>/dev/null
                        echo "OK : deleted orig file (${filename_sanitized})"
                    else
                        rm -f './'"$filename_sanitized"'__2.hw.mkv' >/dev/null 2>/dev/null
                        echo "ERR: file smaller than 2MByte (${filename_sanitized})"
                    fi
                else
                    rm -f './'"$filename_sanitized"'__2.hw.mkv' >/dev/null 2>/dev/null
                    echo "ERR: converted video length too short (${filename_sanitized})"
                fi
            fi
        fi
    fi
done