Video encoded from Dolby True-HD 5.1 version into Dolby Surround (Lt/Rt). Use a Dolby Pro Logic I/II decoder to test your surround system. Although this video is technically stereo, Dolby Pro Logic technology uses matrix technology to pass through additional channels into a stereo mix. The additional channels are expanded by the decoder at your end. If you have no decoder present, the video will seem just like stereo. If you have a Dolby Pro Logic IIx/z decoder, additional channels can be derived into 6.1 or 7.1 surround sound. Dolby Pro Logic mixes can survive YouTube compression and improve your viewer's experience without additional discrete channels. This technology may seem futuristic, but Dolby Pro Logic goes pretty far back with its roots in the original Dolby Surround. Dolby Pro Logic II was a substantial improvement released in 2000 that added 5.1 support with improved channel steer that was backwards/forwards compatible with existing/future decoders. Dolby Pro Logic can also upmix stereo not optimized for decoding with varying results. There is no such thing as a Pro Logic I/II encoder because Pro Logic technology is simply the decoder for a Dolby Surround encoded mix. Dolby Pro Logic is the decode, and Dolby Surround is the encode. Some mixes such as ones included in video games may show the Pro Logic II logo, but this simply means they are "optimized" for Pro Logic II decoding because the game renders lossless 5.1 internally before matrixing to Dolby Surround. YouTube does support uploads of multichannel audio, but only streams them in 2.0 without proper Dolby Surround encoding. This causes all audio in the original mix to be heard, but the surround effect is lost. The Dolby Surround encoding must be done before upload. Dolby Surround is the only way to get multichannel audio on YouTube, right now. Dolby Pro Logic II and the original video is copyright of Dolby Laboratories.
Countdown Version 2 - Dolby Surround (Pro Logic I/II) - YouTube |
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| Film & Animation | Upload TimePublished on 24 Jun 2017 |
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