Place the subtitle file in the same folder as your movie and rename it to match the movie's name exactly (e.g., Doctor.Strange.2016.720p.BluRay.x264.srt ).
If you want to permanently "burn" or embed subtitles into your file for use on devices that don't support external files: subtitle Doctor.Strange.2016.720p.BluRay.x264.[...
You can load a separate .srt or .ass file into your video player using these common methods: Place the subtitle file in the same folder
This guide provides the steps to correctly load and synchronize external subtitles for your 720p BluRay movie file. 1. Match the Subtitle File to Your Movie Match the Subtitle File to Your Movie Can
Can add external subtitles as "hard" subtitles during the ripping process.
A free tool to convert graphic-based Blu-ray subtitles into text-based SRT files or to fix complex drift issues. External subtitles with UHD Bluray files - DVDFab Community