Le 2021-05-23 à 13 h 36, Stefan Schreiber a écrit :
I know for sure that some companies would not like to spend 1 Mbit/s bitrate (or even more) on some HOA track at 3rd or 4th order. (I am not making this up.)
An interesting option (to me) is to stream in lossless FOA and add optional resolution with some parametric decoding (at the listening side). I noticed that FOA sound better with a lossless codec (with or without parametric decoding). I may have a strong bias for "lossless" (and/or that I don't master the art of audio compression). HOA is nice, but more channels doesn't always mean the results will be (a lot) better.
Netflix streams Dolby Atmos at 768 kbit/s. (if available, so this is max. bitrate)
This is for a compressed 5.1 stream at 24 bit resolution, which is marketing; a well produced mix doesn't have much to gain from a 24 bit target. 48Khz is also used as marketing; 32Khz can be enough to bring a decent experience (unless Netflix is streaming for dogs). The ".1 channel" is useless in most domestic situations; good bass management can extract enough low frequency information from available channels. And 5.1 as a native format (for reproduction on actual 5.1 systems, not "sound bars") is probably for a minority of listeners.
A 3-channel 16bit/32Khz Ambisonics FLAC streams requires 750 kb/s. Of course, numbers like this would scare any consumer who want "more" (from branded solutions), but in A/B tests (and situations like head-tracked binaural rendering), this simple version probably works just fine. Disclaimer: I'm not young, so I may not have the best ears.
Distribution though Internet brings a lot of advantages, so we can be creative with available codecs and formats.
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