Usually, if it's a BluRay rip, a delay of 0ms is standard. If you are using a subtitle meant for a WEB-DL or DVD version, you may need to adjust the timing by several seconds.
Since the film is in French , most English-speaking viewers will require "English External" subtitles. If you are looking for the original dialogue, seek "French [forced]" or "French [full]" tracks. Where to Find/Verify the Text subtitle Double.Lover.2017.720p.BluRay.x264.[YT...
Chloé, a fragile young woman, falls in love with her psychoanalyst, Paul. After a few months, she moves in with him, but soon discovers that her lover is concealing a part of his identity—specifically, a twin brother with a much more aggressive personality. Subtitle Details for the YTS/BluRay Release Usually, if it's a BluRay rip, a delay of 0ms is standard
Use G to delay subtitles or H to speed them up. If you are looking for the original dialogue,
The file name you provided is specifically optimized for the encode. To ensure the text syncs correctly with the "720p.BluRay.x264" version, you should look for subtitles with the following characteristics: Format: Typically .srt (SubRip). Frame Rate: 23.976 FPS (standard for BluRay releases).
If you find that the "long text" (the dialogue) does not line up with the audio in your player (like VLC or MPC-HC):