YouTube Audio Codecs - Phase Accuracy (for Matrix Surround Sound)

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Has anyone prepared some test tones/soundtracks to find out if all of the YouTube audio codecs are able to maintain suitable phase accuracy for matrix surround sound encoded soundtracks?

I ask this because, about ~25 years ago, when the VideoCD was introduced, one audio option was MP2 joint stereo, which adversely affected Dolby Surround encoding.


Kirk Bayne
 
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