[vorbis-dev] lossless ogg encoding with good compression rate

General purpose mail maillist at pnpitalia.it
Wed Jun 25 17:40:30 PDT 2003



I think that there is a very simple way to encode audio files with lossless compression around 35%.
(the compression may be improved if we can lose some lsb bits around 30% for 2 and 25% for 3)
Other lossless audio encoder I've seen reach at maximum a compression of 48% (*.flac, *.ape)

So the questions are:
1- Is someone interested in another encoder?
2- If true n.1 may it be included in ogg format?
3- Is there some programmer that can help me, I don't know C a lot :(
4- It'll be not too much cpu consuming.

hopefully someone 'll answer to me.

Follow the description of how I've tested it:
1) create a wav file [A.wav]:
2) encode it in ogg format (my best result with high 7) [B.ogg]
3) decode the ogg into a wav again [C.wav] (the size will be the same as A.wav)
4) create a file with the diff of each sample from A.wav with B.wav [D.tmp] also with the  same size at least of the header.
5) bzip2 the D.tmp [D.tmp.bz2]
6) keep B.ogg and D.tmp.bz2 (the size will be around 17% of the original for each file)

imply is't it?

I think it's simple to recreate the a wave from this.

If it's possible to embed this in the creation process of a ogg file the procedure can become still more simple.

Francesco Riosa

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