Howdy,

I have downloaded a single file that contains a subtitle from a movie but this is embedded in a .mp4 (.ismt) container, here is the media info:

Format : MPEG-4
Format profile : ISML
Codec ID : isml (isom/iso2/piff)
Codec ID/Hint : IIS Smooth Streaming file format
File size : 2.28 MiB
Duration : 1 h 28 min
Overall bit rate : 3 602 b/s
Encoded date : UTC 2020-05-01 20:35:25
Tagged date : UTC 2020-05-01 20:35:25

Text
ID : 1
Format : TTML
Format/Info : Timed Text Markup Language
Codec ID : dfxp
Duration : 1 h 28 min
Compression mode : Lossless

Could someone help me to extract the subtitle (its the only subtitle in the file) and then convert it to .SRT subtitle or any other compatible. I also looked inside the embedded subtitle using note pad and it has all the lines.

If somone knows the answer or wants to help, I drop the file here: https://mega.nz/file/7E9gUAxT#-DEcFpLUqTkuQz9JzzwQLl0PPL0gGlIcE9p-x353CFE