If the subtitles are slightly ahead or behind the audio, you can fix them in real-time using VLC Media Player:

If you want to permanently fix the timing of an out-of-sync file, you can use online tools like the Happy Scribe Subtitle Shifter or software like Subtitle Edit to shift the entire timeline and save a new, corrected file.

: Go to Tools > Track Synchronization to enter a specific numerical offset in seconds. Permanent Fixes

: Press the G key to make subtitles appear later (delay).

: Search for "Flatliners 2017 YTS subtitles" on reputable subtitle sites like YTS Subs to find the specific file for the YTS.AG version.

How To Sync Subtitles With Video Using Visual Sync in Subtitle Edit

: Press the H key to make subtitles appear earlier (hasten).

: For most media players to load the subtitle automatically, rename the downloaded .srt file to match the video file exactly (e.g., Flatliners.2017.720p.BluRay.x264.[YTS.AG].srt ) and keep them in the same folder. Adjusting Sync in VLC Media Player