The.recruit.s01.720p.x264.hindi.english.esubs.v...

ffmpeg -i file.mkv -map 0:s:0 subs.srt :

It looks like you're referencing a file naming convention for a TV series release — specifically (the trailing "V..." likely indicates a version tag from a release group). The.Recruit.S01.720p.x264.Hindi.English.Esubs.V...

If you provide the (including the V... part), I can identify the release group and tell you exactly what container, subtitle format, and audio codecs to expect. ffmpeg -i file