mkvinfo video.mkv

| + Track
|  + Track number: 3 (track ID for mkvmerge & mkvextract: 2)
|  + Track UID: 8685708376066218499
|  + Track type: subtitles
|  + "Forced display" flag: 1
|  + "Lacing" flag: 0
|  + Language: ger
|  + Codec ID: S_HDMV/PGS
|  + Language (IETF BCP 47): de
|  + Name: Forced
|  + "Hearing impaired" flag: 0
|  + "Commentary" flag: 0
|  + Content encodings
|   + Content encoding
|    + Content compression



... except
|  + Track number: 3 (track ID for mkvmerge & mkvextract: 2)
|  + Track UID: 8685708376066218499