FFmpeg shell script

>     !/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