Hydrogenaudio Forums > New lossless codec (2:1)

Hydrogenaudio Forums > Lossless Audio Compression > Lossless / Other Codecs

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m0rbidini

Jun 20 2003, 17:46

Skymmer was harsh but I agree with him...

Christophe: It seems to me that you are on a very early stage of development (maybe only in the research phase), and that all your claims are nothing but hopes. There are some people in this forum (and others not in this forum) who already worked hard on lossless codecs and they cannot do what you mentioned. As Josh said, it isn't possible to create a lossless codec that can guarantee a 2:1 lossless compression ratio. Also, you haven't answered some of the questions that were made.

We don't mean to take your motivation. But please understand that these kind of claims are not taken seriously without results...

cya

Gabriel

Jun 21 2003, 09:41

I know that your books are now a few years old.
That is why I did not take into consideration the facts that changed. The few examples that I gave have never been right, no matter the year.

I just used it to try explaining you that although you probably have some knowledge that some of us do not have here, you also have to accept that some people here might have some knowledge that you do not have.

This is just an exchange.

btw I am serious regarding the verification of potential upcoming books. I was very upset to see some books for sold dispatching some serious mistakes (not your ones) - and It should problaby be faster than when I did it for english books.

eltoder

Jun 23 2003, 08:53

QUOTE(_Shorty @ Jun 20 2003 - 10:12 AM)

has anyone ever tried making a lossless codec that also uses lossy techniques, kind of like how (I believe, but could be wrong) how 'huffyuv' works with video? I believe huffyuv encodes the frame with jpg and then uses huffman coding on the difference between the original and the jpeg to obtain a lossless copy. I would imagine it would be quite possible to do something like an mp3 or vorbis encode, get the difference from the mp3/vorbis copy and the original copy, and then do a lossless compression on the difference data...but I wonder if it would actually be any good from a size standpoint. If it actually gave anything resembling decent results, sizewise, that would be great. Small lossless audio.

This was already implemented in LTAC (lossless transform audio codec). It uses simple DCT for lossy coding and arithmetic coding for difference. It's written by the same author as LPAC, and he claims that LPAC is better in both speed and compression IIRC.

-Eugene

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edit: This thread has been closed because of this post. If anyone has something usefull to add, feel free to PM me and I'll re-open it. -tigre

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