: If you use VLC, go to View > VLsub . It can automatically search for the correct subtitle file based on the hash of the video file you are playing.
: One of the largest databases where you can search for the "BluRay.x264" tag to find matches for your file's frame rate and length. subtitle Mamma.Mia!.2008.1080p.720p.BluRay.x264...
: Place both the video and the .srt file in the same folder. : If you use VLC, go to View > VLsub