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Playing raw AAC without transcoding
scarf:
OK thanks, probably right... how could I tell which version it is?
Also what would be the best way to make these files playable with least possible quality loss? I opened up the aac file in Audacity and took a look at the spectrogram, looks like it's about 34 kHz. I tried transcoding it to mp3 q9 (worst) and it cut the audio way down to 22 kHz and doubled the file size :'(
Ogg q0 (worst) was better, cutting it to 30 kHz and increasing the file size by 50%.... any other ideas? thanks
saratoga:
Normal hearing only goes up to 16 KHz, so there shouldn't be higher frequencies in normal audio.
I would convert the files to Ogg or regular AAC.
scarf:
Well yeah, I was looking at the total frequency of the file, so a 30 kHz Ogg file with 2 channels would be 15 kHz for each channel (ear), so it should be pretty OK.
but your statement reminds me of something quite interesting. Research has been done that instruments can produce frequencies over 100 kHz and, even though we don't hear these frequencies, they still have an effect on the tiny bones in our inner ear and our bodies, contributing to the overall "listening experience"... but short of a live concert, would need top-notch recordings and audio-reproduction equipment to re-experience the frequencies. But cutting out those frequencies does have effects... something to think about.
https://www.cco.caltech.edu/~boyk/spectra/spectra.htm
But for listening in the car, the Ogg looks like the best bet. AAC produces the cleanest copy but the file size more than quadruples!
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