If the subtitle is out of sync and you want it to align starting at , you need to delay or advance all timestamps.
ffmpeg -i input.mkv -map 0:s:0 subtitles.eng.srt
If the subtitle is out of sync and you want it to align starting at , you need to delay or advance all timestamps.
ffmpeg -i input.mkv -map 0:s:0 subtitles.eng.srt