Using external Subtitles provided as an .vtt in a HLS Player

[SteveHoffmannCarl]

Question

Hey i'm looking into MediaMTX and got some ways to use the video which is published to MediaMTX for Subtitle Generation. The Plan is to either stream the audio from a path directly to an external service to generate a transcription or convert the HLS Segments to an audiofile and generate the transcription.

This part is mostly ready at the moment. Sadly i can't find a comfortable way to get my transcripted text back to MediaMTX and inject it in the playlist (main_stream.m3u8).

My idea at the moment is, to adjust the generation of the main_stream.m3u8 and link to a subtitle.m3u8 which is stored in the hlsDirectory.

What is your opinion? could this be a solid way or am i missing something?

Thanks for your help! :)

[aler9]

Hello, subtitles are currently unsupported but nothing prevents from supporting them in the future. I've created a feature request here: bluenviron/gohlslib#259

[Nedomas]

are there any workarounds for mediamtx + subtitles @aler9 @SteveHoffmannCarl ?

[SteveHoffmannCarl]

Currently i didn't found anything that works out of the box. One Solution that worked temporarily for me, was using the nginx-rtmp self compiled for adding a subtitle playlist.
I have seen another workaround recently. There was a separate javascript script, which pulled the subtitles from an API endpoint and rendered it on top of the player with an additional div.
Quite easy and handy i guess - didn't try it myself yet but planning to.