Ogg+Flac as lossy+recovery file!
Reply #39 – 2002-02-21 17:48:19
Well, I've been experimenting with deltaS (the leftover) since I'm trying to find the most optimal way to store field recordings for my samples. I record a lot, but sometimes just don't have the time to manipulate. So I store the result, until I at least have the time to edit and take off the garbage (the long useless parts of a 2 hours recording....) In my case, I was particularly interested in compression closest possible to "bit perfect", since the material will, later, be manipulated and that psymodel can ruin an "artifact" that I may want to isolate later... Someone have suggested that Lossless Audio compressor (Monkey's, flac, shorten and friends) MIGHT not be the most efficient for the nature of the data contained in a leftover file. He was suggesting that a general purpose compressor would PROBABLY be better than one specialised with AUDIO. (In fact that was an interesting idea, because it's pretty true that DeltaS (leftovers) sound like fuzz or filtered white noise,; and the higher the bitrate of the lossy codec, the more fuzzy (and small) is the leftover. Try with Lame --freeformat 500kbps, fuzz-fuzz-fuzz. I tried, yet only once, to compress the leftover with zip instead of Monkey . Here's the result: Aphex Twin- I care because you do- 08 - Wet tip hen ax compressed with lame --alt-preset lowpass18 -F the result was 8 592 KB (original 54 655kb) the leftover compressed, in Monkeys audio at 43% the original size and in winzip, 55%, so I believe that Audio compressor are still more suited for leftovers than Genral purpose one. I may théorize that even if the result (leftover) sounds like fuzz, the samples in it still bear a strong correlation, that Monkey's audio is more able to exploit than WinZip. I would permit myself to add this note: Compression is still FAR from being pushed at it's max, we will see lossless Audio Compressor that will perform at ratios like 40 or more, just because Music is a lot simpler than we may think, there is so much redundency that today's Codecs and compressors don't perceive. Both Codec and compressor look at Audio data with a microscope, searching for extremely local redundency. They incorporate not much AI (if at all), they don't understand the nature of the sounds they compress.... Just look at MPEG4-SA (structured audio) the plan is to determine what instruments are played, in what way, the recreate it in a midi-like way, and then, to correct the mistakes that have been made.... Pretty powerfull and extremely scalable....Better than CD quality at 32kbps....