Prerequisites

• Make sure that chromecast or chromecast enabled device (i.e. projector with Android TV) and PC are connected to the same network
• If you are using AV System, for example in my case Sony HT-X8500 soundbar, then setup should be as following:
  • Connect AV system to PC using HDMI cable (HDMI input post should be used on AV System, not HDMI ARC/eACR)
  • Connect monitor or projector on HDMI ARC/eACR port of AV System (AV System will extract audio and pass-through video on HDMI ARC/eACR port)

VLC

• Download and install VLC
• Make sure that your PC and chromecast are connected to the same network
• Play video (i.e. mkv or mp4 movie) with VLC
• Menu > Playback > Renderer > select your chromecast

Movies & TV app

• Play video (i.e. mkv or mp4 movie) with “Movies & TV” app
• Click “…” on the bottom right > Cast to device > select chromecast

Chrome browser

• Open empty tab
• Drop video file on chrome (in my test, only mp4 worked, for mkv chrome started downloading instead of playing)
• Right on video > Cast > select your chrome cast

Convert an MKV file to MP4 using VLC:

• Run “VLC media player”
• From main menu select “Media” > “Convert / Save”
• On “File” tab, click “Add” button
• Choose you MKV file
• Click “Convert/Save” button
• Select Profile: “Video – H
• Click on the icon button that has hint: “Edit selected profile”