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Lossless CD-Quality Streaming Radio
- Thread starter radiojomo
- Start date
First and foremost MP3, AC3, MP4/AAC/HLS and Vorbis are not, never have been and never will be lossless codecs. Abandon all hope. That's FLAC's and PCM's turf. Much too technical to explain why here; look it up on Wikipedia. At any rate, mathematically, a PCM file decoded from an MP3/4 file will be totally different of the master PCM used for encoding. Rip a cut from your favourite CD, fire up LAME, generate an SHA256 checksum of the PCM audio file from the CD and the MP3 file you encoded from it (lame -b320 -ms -q0 infilename.wav outfilename.mp3) and you will see they are different. There is "perceptual losslessness" (a.k.a transparency) which is only acheived by using high bitrate (256Kb and up), loose psychoacoustic modelling and channel configuration (i.e. discrete stereo rather than "joint" (phase matrix) stereo). Not the same thing as mathematical losslessness, which is impossible using any current MPEG audio codec.
44100 and 48000 Hz are standard sample rates that pretty much everybody these days uses. There might be one or two little independent streamers using lower sample rates (even Tempo FM in Wetherby upgraded from 22050 to 44100 about 5 or67 years ago) or a straggler still using Cook codec but these are becoming more and more rare. 8-bit sample resolution hasn't had widespread use outside of telephony and very old computer games for maybe 20? years now, if not longer. MPEG-1 audio codecs AFAIK don't directly support 8 or 24 bits, rescaling them to 16 bit.
There have been streamers encoding in FLAC format (none that I know of currently) but they are/were a rarity because of its extremely inefficient bandwidth usage for not really that much fidelity gain for most people, relative of just streaming in 320Kb Q0 LAME.
Anyhow, the sample rate and depth you specify has been in extremely wide use since, like, forever.
I'm sure kevtronics (Vwestlife) will be along shortly to detail why and how I'm wrong.
Uh..... what was your question again?
44100 and 48000 Hz are standard sample rates that pretty much everybody these days uses. There might be one or two little independent streamers using lower sample rates (even Tempo FM in Wetherby upgraded from 22050 to 44100 about 5 or67 years ago) or a straggler still using Cook codec but these are becoming more and more rare. 8-bit sample resolution hasn't had widespread use outside of telephony and very old computer games for maybe 20? years now, if not longer. MPEG-1 audio codecs AFAIK don't directly support 8 or 24 bits, rescaling them to 16 bit.
There have been streamers encoding in FLAC format (none that I know of currently) but they are/were a rarity because of its extremely inefficient bandwidth usage for not really that much fidelity gain for most people, relative of just streaming in 320Kb Q0 LAME.
Anyhow, the sample rate and depth you specify has been in extremely wide use since, like, forever.
I'm sure kevtronics (Vwestlife) will be along shortly to detail why and how I'm wrong.
Uh..... what was your question again?
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The "
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I didn't realize Kevtronics was Vwestlife. I watch his You Tube channel.
I think they will seek to attract and retain an audience in a way that makes business sense.
On the technical side, the outlook for audio quality is fantastic!
Of the stations I've heard, I'm very impressed with the subjective audio sound quality of streaming by the major radio groups.
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