Convert videos to proper formats for HTML5 video on Linux shell using ffmpeg.

html5-video.sh

#!/bin/sh

# configure stuff
width=640
height=320
size=$width"x"$height

# show help
if [[ "$1" == "" || "$1" == "-h" || "$1" == "--help" ]]; then 
    echo "USAGE: ";
    echo "$(basename $0) [wmo] video.avi";
    echo "  w: WebM";
    echo "  m: MP4";
    echo "  o: OGG";
    exit 1;
fi

# parameters are optional, make all targets if none specified
if [ "$2" = "" ]; then 
    f=$1; 
    p="wmo"; 
else
    f=$2; 
    p=$1;     
fi

# file name mangling
dir=$(dirname $f)
file=$(basename $f)
name=${file%.*}
extension=${file##*.}

# abort if file doesn't exist
if [ ! -e $f ]; then echo "File $f not found"; exit 1; fi

if [[ "$p" == *w* ]]; then
    # webm
    ffmpeg -i $f -f webm -vcodec libvpx -acodec libvorbis -ab 128000 -crf 22 -s $size "$dir/$name.webm"
fi

if [[ "$p" == *m* ]]; then
    # mp4
    ffmpeg -i $f -acodec aac -strict experimental -ac 2 -ab 128k -vcodec libx264 -vpre slow -f mp4 -crf 22 -s $size "$dir/$name.mp4"
fi

if [[ "$p" == *o* ]]; then
    # ogg (if you want to support older Firefox)
    ffmpeg2theora $f -o "$dir/$name.ogv" -x $width -y $height --videoquality 5 --audioquality 0 --frontend
fi

Just for the record: on my Ubuntu 11.10, it needs #!/usr/bin/env bash instead of #!/bin/sh.