Ensure you match the subtitle to your movie version. The Extended Cut (approx. 151 minutes) has different timing than the Theatrical Cut (approx. 144 minutes). If the text appears on screen too early or too late, you likely have a mismatch between these versions.
If you've downloaded the subtitle and it's slightly off, most media players allow you to adjust the sync manually: subtitle The Martian 2015.1080p.x264.Bluray-Har...
If you're looking for help with the subtitle file for , specifically the 1080p.x264.BluRay release, Finding the Correct Subtitle Ensure you match the subtitle to your movie version
Most downloads will be in .srt (SubRip) format, which is widely compatible with players like VLC and Plex. specifically the 1080p.x264.BluRay release