php implementation

<?php
print system("  #  !/bin/bash
    #
    #
    # ffmpeg libxvid
    # --------------------------------------------------------------------------------------------------------
    # ffmpeg -i Input-Filename.avi -f mp4 -y \
    # -vcodec libxvid -b:v 600k -acodec libfaac -b:a 96k -ac 2 -ar 44100 \
    # -r 25 -s 640x272 -aspect 640:360 -vf pad=640:360:0:44 \
    # -threads 2 -async 1 -pass 1 /dev/null
    # ffmpeg -i Input-Filename.avi -f mp4 \
    # -y -vcodec libxvid -b:v 600k -acodec libfaac -b:a 96k -ac 2 -ar 44100 \
    # -r 25 -s 640x272 -aspect 640:360 -vf pad=640:360:0:44 \
    # -threads 2 -async 1 -pass 2 ./Input-Filename-ffmpeg.mp4
    #
    # ffmpeg libx264
    # ----------------------------------------------------------------------------------------------------------
    # ffmpeg -i Input-Filename.avi -f mp4 -y \
    # -vcodec libx264 -b:v 600k -acodec libfaac -b:a 96k -ac 2 -ar 44100 \
    # -r 25 -s 320x196 -aspect 320:240 -vf pad=320:240:0:22 \
    # -threads 2 -async 1 -pass 1 /dev/null
    # ffmpeg -i Input-Filename.avi -f mp4 -y \
    # -vcodec libx264 -b:v 600k -acodec libfaac -b:a 96k -ac 2 -ar 44100 \
    # -r 25 -s 320x196 -aspect 320:240 -vf pad=320:240:0:22 \
    # -threads 2 -async 1 -pass 2 ./Input-Filename-ffmpeg.mp4    Usage
    # --------------------------------------------------------------------------------------------------------
    # Command-line options:
    # -a : Video aspect ratio. Could be either 1.77 or 2.35 (default)
    # -b : Video bitrate. Should be in the form of 600k (default)
    # -c : Video codec. Should be either libx264 or libxvid (default)
    # -d : Output directory. Current directory (.) is the default
    # -y : Whether to ask confirmation before overwriting any file.
    #    Should be either "yes" (default) or "no"
    # Command-line options
    while getopts 'a:b:c:d:o:p:y' opt "$@"; do
    case "$opt" in
    a) video_aspect="$OPTARG" ;;
    b) vbitrate="$OPTARG" ;;
    c) video_codec="$OPTARG" ;;
    d) output_dir="$OPTARG" ;;
    o) addl_options="$OPTARG" ;;
    p) passes="$OPTARG" ;;
    y) ask_confirmation="no" ;;
    esac
    done
    shift $((OPTIND - 1))
    # Defaults
    video_aspect="${video_aspect:-2.35}"
    video_codec="${video_codec:-libxvid}" # or libx264
    vbitrate="${vbitrate:-600k}"
    passes="${passes:-2}"
    output_dir="${output_dir:-.}"
    vpre=""
    if [[ "$video_codec" == "libx264" ]]; then
    vpre="-vpre ipod320"
    aspect="320:240"
    if [[ "$video_aspect" == "2.35" ]]; then
    resolution="320x196"
    pad="pad=320:240:0:22"
    elif [[ "$video_aspect" == "1.77" ]]; then
    resolution="320x240"
    pad="pad=320:240:0:0"
    fi;
    elif [[ "$video_codec" == "libxvid" ]]; then
    aspect="640:360"
    if [[ "$video_aspect" == "2.35" ]]; then
    resolution="640x272"
    pad="pad=640:360:0:44"
    elif [[ "$video_aspect" == "1.77" ]]; then
    resolution="640x360"
    pad="pad=640:360:0:0"
    fi;
    fi;
    echo "Encoding '${#@}' video(s)";
    for in_file in "$@"; do
    # If the filename has no extension
    if [[ -z "$(echo "$in_file" | grep -Ei "\.[a-z]+$")" ]]; then
    fname="$(basename "${in_file}")-ffmpeg.mp4"
    else
    fname="$(basename "$in_file" | sed -sr 's/^(.*)(\.[^.]+)$/\1-ffmpeg.mp4/')"
    fi
    out_file="${output_dir%/}/${fname}"
    # Avoid overwriting files
    if [[ "$ask_confirmation" != "no" ]] && [[ -f "$out_file" ]]; then
    echo -n "'$out_file' already exists. Do you want to overwrite it? [y/n] "; read response
    [[ -z "$(echo "$response" | grep -i "^y")" ]] && continue
    fi
    # 1st pass
    ffmpeg -i "$in_file" \
    -f mp4 -y $addl_options \
    -vcodec "$video_codec" -b:v "$vbitrate" $vpre \
    -acodec libfaac -b:a 96k -ac 2 -ar 44100 \
    -r 25 -s "$resolution" -aspect "$aspect" -vf "$pad" \
    -threads 2 -async 1 -pass 1 \
    "/dev/null"; # $out_file;
    # 2nd pass
    ffmpeg -i "$in_file" \
    -f mp4 -y $addl_options \
    -vcodec "$video_codec" -b:v "$vbitrate" $vpre \
    -acodec libfaac -b:a 96k -ac 2 -ar 44100 \
    -r 25 -s "$resolution" -aspect "$aspect" -vf "$pad" \
    -threads 2 -async 1 -pass 2 \
    "$out_file";
    done
2>&1");
?>