About Belarusian transcription
Belarusian (Беларуская) is written in Cyrillic and spoken principally in Belarus. Subtitles generated here come back in that script, as ordinary written Belarusian, ready to use in an SRT or VTT file.
Belarusian and Russian share the Cyrillic script and a great deal of vocabulary, and mixed Belarusian-Russian speech is ordinary in daily life rather than exceptional. Detection between them is correspondingly unreliable, so set the language explicitly when you know it.

