How to build Chromium Embedded Framework3 (CEF3) with video codec support?

Question

Chromium Embedded Framework

I use CEF3 in a Delphi XE6 project.
https://github.com/hgourvest/dcef3
There is no video support by default, it is only in the Chrome build.
To make it appear, you need to rebuild everything with certain flags.
Specific branch 2454 is required to work with https://github.com/hgourvest/dcef3
There are builds https://cefbuilds.com/ , but for Chromium.
Has anyone managed to enable video support at all?
about 40 gigs of code and 8 hours of waiting, in the end everything came together, but the video does not work.
I did everything according to the instructions, added
proprietary_codecs=1 ffmpeg_branding=Chrome
MasterBuildQuickStart
https://code.google.com/archive/p/chromiumembedded...