Is there any difference between SRT and SBTL?

[Hakunamatata67]

I have a video with embeded subtitles:

Text #1 
ID : 3 
Format : Timed Text 
Muxing mode : sbtl 
Codec ID : tx3g 
Duration : 43 min 56 s 
Bit rate mode : Variable 
Bit rate : 125 b/s 
Stream size : 40.2 KiB (0%) 
Title : English [CC] / English [CC] 
Language : English 
Forced : No 
Encoded date : UTC 2022-01-13 16:38:08 
Tagged date : UTC 2022-01-13 16:38:08

When I extract it to, I see no difference with a random SRT file.
So what's SBTL meant for?

[jagabo]

SBTL is the way it's muxed, not the type of subtitle. Timed Text is the subtitle format. It's the type used in MP4 files. It's not the same as SRT. If you're getting an SRT file when you extract it it's because the program is converting to SRT.

[Hakunamatata67]

ok! thanks for the explanation!