Technically it's possible. We did do inlaid server-side ads that way for a while. IT just takes an excessive amount of work. The real solution is just the fu

Technically it's possible. We did do inlaid server-side ads that way for a while. IT just takes an excessive amount of work. The real solution is just the full support of ASS/TTML/VTT subtitles on all platforms. Usually smart devices are kind of only partially supported. For instance - casting to a chromecast fallsback to SRT.