Chromium

The native "Cast..." does not work until you enable this flag below. Once its enabled, it works perfect, no need for any extension.

chrome://flags/#load-media-router-component-extension

set to enabled.

tested on Version 60.0.3112.113 (openSUSE Build) (64-bit)

Command line

catt

$ ~/.local/bin/catt -d Kitchen cast -s ./Men.in.Black.2.2002.1080p.BluRay.H264.AAC-RARBG.srt ./Men.in.Black.2.2002.1080p.BluRay.H264.AAC-RARBG.mp4 
$ ~/.local/bin/catt -d "Kitchen" cast "https://www.youtube.com/watch?v=dQw4w9WgXcQ"