Because this is a specific YTS rip, you need a version with the correct "sync" (timing). Look for subtitles on these reputable repositories:
For most media players (VLC, MPC-HC, Plex) to recognize the file automatically, the subtitle file and the movie file must have the exact same name, except for the extension. Movie: Incendies.2010.720p.BluRay.x264.[YTS.AG].mp4 Subtitle: Incendies.2010.720p.BluRay.x264.[YTS.AG].srt Folder Placement: Keep both files in the same folder. 3. Loading in Popular Players
To find and use the subtitle file for that specifically matches the 720p BluRay x264 [YTS.AG] release, follow this guide: 1. Where to Find the Subtitles