Do not rely on auto-generated YouTube or streaming rips. Go to a dedicated subtitle repository such as:
Exploring "Cloud Atlas" (2012): A Guide to the 720p BRRip, Subtitles, and YIFY Experience
Move your Cloud Atlas video file and the downloaded subtitle file into the same folder.
Indicates a high-definition resolution of 1280x720 pixels.
Rename the subtitle file to match the exact name of the video file (keeping the .srt extension). Video: Cloud.Atlas.2012.720p.BRRip.YIFY.mp4 Subtitle: Cloud.Atlas.2012.720p.BRRip.YIFY.srt