The VideoLAN Forums

I've tried streaming mkv, mp4, added subs, didn't add subs, hardcoded subs, packs subs, forced subs, default subs.

It doesn't matter what I do to the file, how I pack it and all that -- the receiving end of the stream NEVER gets subs at all, even if I have it on my home/source stream. Is this just not possible?

Yes, it is possible, but it is complex to do.

You could try hardcoding them, but as stated before it's fairly complex to do.