Convert videos to proper formats for HTML5 video on Linux shell using ffmpeg. Will probably convert this to a bash script later, but for the time being, here's some examples. Not sure there have actually sensible dimensions and bitrates for web video.

ffmpeg-html5

# webm
ffmpeg -i IN -f webm -vcodec libvpx -acodec libvorbis -ab 128000 -crf 22 -s 640x360 OUT.webm

# mp4
ffmpeg -i IN -acodec aac -strict experimental -ac 2 -ab 128k -vcodec libx264 -vpre slow -f mp4 -crf 22 -s 640x360 OUT.mp4

# ogg (if you want to support older Firefox)
ffmpeg2theora IN -o OUT.ogv -x 640 -y 360 --videoquality 5 --audioquality 0  --frontend

Maybe someone is interested in my stuff ;)

#!/usr/bin/zsh
# based on https://gist.github.com/yellowled/1439610
IN=$1
OUT=$(echo $1 | sed 's/^\(.*\)\.[a-zA-Z0-9]*$/\1/')
# webm
ffmpeg -i $IN -f webm -vcodec libvpx -acodec libvorbis -ab 128000 -crf 22 -s 640x360 $OUT.webm

# mp4
ffmpeg -i $IN -acodec aac -strict experimental -ac 2 -ab 128k -vcodec libx264 -vpre slow -f mp4 -crf 22 -s 640x360 $OUT.mp4

# ogg (if you want to support older Firefox)
ffmpeg2theora $IN -o $OUT.ogv -x 640 -y 360 --videoquality 5 --audioquality 0  --frontend

Thanks for sharing this script. Extremely useful!

BTW I found that while single-pass webm video looks bad compared to h264 videos with the same size, its performance is pretty satisfactory when using 2-pass encoding workflow.

ffmpeg -i $(IN) -c:v libvpx -pass 1 -an -f rawvideo -y /dev/null  # Generates ffmpeg2pass-0.log
ffmpeg -i $(IN) -c:v libvpx -pass 2 -f webm -b:v 400K -crf 10 -an -y $(OUT).webm

Thanks very useful ;)

Just what I needed! Convertion to webm succesful, but to mp4 i received the error message: "File for preset 'slow' not found"

Looking around, i found out that now the preset option must be declared using -preset instead of -vpre - thanks to Stack Overflow: http://stackoverflow.com/questions/11929109/i-only-have-two-presets-for-ffmpeg-x264-in-ubuntu-11-04

That helped a lot! Thanks for sharing ;)

This was a good starting point. I went further and am to do all the encoding without having to directly install FFmpeg! https://github.com/chuyskywalker/easy-web-video-encode

THANK YOU!

As @joaofnr said, -vpre does need to be changed to -preset in the mp4 line

Will probably convert this to a bash script later, but for the time being, here's some examples.

Well, I did it now. https://github.com/rpsu/dvd_converter/