"Hindi-Line" usually means the audio was recorded directly from the theater's sound system or via a microphone, resulting in muffled dialogue and distracting background noise (like people coughing or laughing in the theater).
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Rohit Saraf, Pashmina Roshan (debut), Jibraan Khan, and Naila Grrewal. Director: Nipun Dharmadhikari. "Hindi-Line" usually means the audio was recorded directly