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  • Nov 20 07:22
    linrio opened #558
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  • Jul 10 14:23

    jonsneyers on master

    Notice for JPEG XL Merge pull request #554 from sa… (compare)

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Jon Sneyers
@jonsneyers
JPEG XL draft spec is here: https://arxiv.org/abs/1908.03565
Pieter Wuille
@sipa
5 different entropy coders?
Jon Sneyers
@jonsneyers
@ika4 you can try -N -B
Zoey Riordan
@ZoeyR
how close is this to the final spec do you know?
Jon Sneyers
@jonsneyers
@dgriffen that will depend on ISO ballot comments and core experiment results
but probably there will still be quite some difference
Zoey Riordan
@ZoeyR
fair enough. It would probably be a waste of time for me to write a rust implementation based on the draft then I'm guessing?
Pieter Wuille
@sipa
oh, no 6
brotli, ANS, sANS, BAC, huffman, ABRAC
Jon Sneyers
@jonsneyers
I personally would like to get rid of some entropy coders (I think 3 different ones are needed, but no more), the Brunsli mode (dedicated jpeg recompression; this can also be done in the normal kPasses mode), and the dedicated lossless mode
basically everything after page 135 should be removed in my opinion, but I'm having a hard time convincing the Google team :)
I want to keep Brotli, ANS and ABRAC.
Zoey Riordan
@ZoeyR
well at the very least I'll reserve the rust crate name so no one else poaches it
Jon Sneyers
@jonsneyers
(MABEGABRAC is basically the same thing as MANIAC, by the way)
The Jared Wilcurt
@TheJaredWilcurt
:tada:
This is good progress
mo0nsniper
@mo0nsniper
How is the compression from PIK used in Jpeg XL? In FUIF I understand that the same algorithm is used both for Loossless and Lossy compression.
Jon Sneyers
@jonsneyers
JPEG XL (at least the current version of the spec) has 4 modes, which basically correspond to pik-lossy, pik-lossless, fuif, brunsli
Andrew Kvapil
@viluon
Hi, pardon the question, but is FLIF dead?
The Jared Wilcurt
@TheJaredWilcurt
@viluon FLIF is a filetype. There are tools to convert from other file types to it, and tools to view those files. It is open source so anyone can contribute to it to improve it, or create their own encoding/decoding tools based on the spec and existing source code.
Active development efforts seem to have moved from it to FUIF and JPEG XL, which will have FUIF essentially built in, and FUIF has many ideas that are taken from FLIF
aeriksen
@aeriksen
UGUI_FLIF doesn't seem to do anything. Running on MacOS
aeriksen
@aeriksen
It doesn't convert
Andrew Kvapil
@viluon
@TheJaredWilcurt yes, it is these active development efforts that I was talking about.
TobiasKnauss
@TobiasKnauss
any news regarding the standardization of JPEG XL and a demo implementation?
cathugger
@cathugger
The Jared Wilcurt
@TheJaredWilcurt
Hype
Neil Sandage anagram"Nile_EdenAgs" Hamilton+Sandys
@NEdenags_twitter
I want to replace JPEG, since FLIF is better than JPEG, how soon Fuji Camera, and Replace Motion JPEG aka MPEG video? ~ any guess about h.264 h.265 or VC1 or my favorite Matroska
The Jared Wilcurt
@TheJaredWilcurt
@NEdenags_twitter All of the good ideas from FLIF and FUIF are being added into JPEG-XL.
Jon Sneyers
@jonsneyers
JPEG XL will have slightly better lossless compression than FLIF, and it will decode about twice as fast on single-core and be parallelizable. Lossless encode is still rather slow atm, we still need to improve that.
We took MANIAC from FLIF, turned it into MA-ANS, and made it significantly more powerful: it also does lz77-style references, it has a predictor and multiplier per MA context, and more predictors and MA properties.
Jon Sneyers
@jonsneyers
The FLIF/FUIF-based mode in JPEG XL is called "Modular mode", and it is used for various things: lossless mode, the DC (1:8 image) in lossy mode, alpha and other extra channels, and all kinds of internal auxiliary images in lossy mode (the adaptive quantization map, block type selection map, chroma from luma coefficients, custom quantization tables, filter strength maps).
Version 0.1 was released last week. Plan is to reach 0.2 soon (bw-compatible bitstream), then 0.3 (stable libjxl api) by January, and hopefully we can get in the next Android and in Chrome somewhere in 2021.
The Jared Wilcurt
@TheJaredWilcurt
omg :heart: :heart: :heart: :heart: :heart: :heart:
this is extremely exciting