You not say if you use Linux version of game or make own version using NW.js. If use NW.js it come with video dependency libffmpeg.so which not play mp4 video as in ToN. Symptom is start game, maybe get intro screen and then black screen with random sound. If this is problem cure is to replace shared object libffmpeg.so in the lib directory of game with appropriate prebuilt mp4 capable version of library download from link below:
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(Can download NW.js itself from
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if need to update whole thing; version 54.0 with latest ffmpeg library from link above download and replace work fine on Ubuntu 20.04 or Ubuntu based Linux with 5.4.0 kernel but not sure about best version for Arch based Linux which usually update to latest version of everything and lead sometime to regression!)
(Best to change name of original first so if not work can restore original.
)
I attach zip file of recent 64-bit Linux version of library (0.52.2-linux-x64) I use which work for me if wish to try.
Definite worth a go I say.