added note about interface customization
add custom.css to .gitignore
added symfony/process to composer.json
add ability to configure transcoder presets
limit the amount of presets to one per codec
add the transcode controller
use as many threads as there are CPU cores
obey the preset's resolution
rename the "Watch" button to "Watch in external player"
add a rudimentary in-browser player based on video.js

Only works for movies so far, and only those that are a single file