make a bunch of html5 video formats from a source video

html5vid.sh

#!/bin/sh

# html5vid.sh
#
# Encode an input video to multiple html5-ready formats:
#   - webm
#   - ogv
#   - mp4
#   - png (50th frame)
#
# html5vid.sh requires the following utilties:
#   - ffmpeg
#   - ffmpeg2theora
#   - ImageMagick
#   - HandBrakeCLI

filename=$1
dimensions="320x240"
output_directory=

usage() {
  echo "usage: $0 myvideo.mp4 [-d dimensions] [-o outputdirectory]"
}

# Exit if no options are given
[ -z $filename ] && usage && exit 1

# Exit if input file doesn't exist
[ ! -f $filename ] && echo "error: input file \"$filename\" doesn't exist" && exit 1

shift
while getopts d:o: opt; do
  case $opt in
    d) dimensions="$OPTARG";;
    o) output_directory="$OPTARG";;
    ?) usage
       exit 1;;
  esac
done

# TODO assumes input file format is mp4
video_name=$(echo $filename | sed "s/.mp4//g")

# If no output directory is given, set it to the video name
[ -z $output_directory ] && output_directory=$video_name

filepath=$(pwd)
original=$filepath/$filename
tmpdir=$output_directory/.tmp
mkdir -p $output_directory $tmpdir

cd $tmpdir

width=$(echo $dimensions | awk '{split($0,w,"x"); print w[1]}')
video_bitrate=614400
gop_size=250

# webm

# webm: first pass
ffmpeg -pass 1 -passlogfile $video_name -threads 16  -keyint_min 0 -g $gop_size -skip_threshold 0 -qmin 1 -qmax 51 -i $original -vcodec libvpx -s $dimensions -b $video_bitrate -aspect 4:3 -an -y $video_name.webm

# webm: second pass
ffmpeg -pass 2 -passlogfile $video_name -threads 16  -keyint_min 0 -g $gop_size -skip_threshold 0 -qmin 1 -qmax 51 -i $original -vcodec libvpx -s $dimensions -b $video_bitrate -aspect 4:3 -acodec libvorbis -y $video_name.webm

# encode ogv
# TODO use ffmpeg to do this and remove ffmpeg2theora dependency
ffmpeg2theora -o $tmpdir/$video_name.ogv --videoquality 5 --audioquality 1 --max_size $dimensions $original

# encode mp4
# TODO use ffmpeg to do this and remove HandBrakeCLI dependency
HandBrakeCLI --preset "iPhone & iPod Touch" --width $width --vb 600 --turbo --input $original --output $video_name.mp4

# make png
# make a png file by extracting the Nth frame from the source video
convert -resize $dimensions $original[50] $video_name.png

# move files to parent directory
for ext in webm png ogv mp4; do
  [ -z $video_name.$ext ] && mv $video_name.$ext ../
done

# cleanup
rm -rf $tmpdir