remixed movies

How can old movies be in surround sound?

Episode 1098

Charles from New York, NY

Charles is annoyed with Netflix' attempts to encode movies in mono that are being decoded into stereo. He's also noticing that old movies on Blu-ray are doing the same thing. Is there a new 2 channel stereo to 5.1 surround conversion technology going on? David says that there are certain older movies that have remixed in Blu-ray and it's likely those are the movies that have been used, and Netflix is likely using that remixed master. Scott says that Dolby Pro-Logic can also take a standard stereo signal and spread it out over Dolby 5.1 surround.