Subtitles on WMS and SERVIIO - SONY BRAVIA

Hello.
I understand that WileMediaServer does support embedding subtitles in the video stream during transcoding.
How does it done ?
WMS also uses ffmpeg and the embedding (at least SRTs) has not been released yet.
If we figure out how WMS does this using ffmpeg maybe ZIP can implement it in SERVIIO.
How know that most (if not all
) SONY BRAVIA holders are looking for this for a long time.
Cheers.
I understand that WileMediaServer does support embedding subtitles in the video stream during transcoding.
How does it done ?
WMS also uses ffmpeg and the embedding (at least SRTs) has not been released yet.
If we figure out how WMS does this using ffmpeg maybe ZIP can implement it in SERVIIO.
How know that most (if not all

Cheers.