stands for "Machine Subtitles." This indicates that the subtitles in the file were generated automatically by software, rather than being manually transcribed by a human. Machine subtitles are often flawed; they can contain mistimed sync, grammatical errors, and incorrect word interpretations, especially if the audio quality is poor or the dialogue contains slang. For a Hindi-speaking audience watching a Hindi film, this may be less of a concern, but international viewers seeking English or other language subs might find them frustrating.
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