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Search took 0.01 seconds. Search: Posts Made By: skal
Forum: New and alternative video codecs 19th November 2021, 16:28
Replies: 83
Views: 40,723
Posted By skal
?! there's nothing really scary about assembly...

?! there's nothing really scary about assembly code, all things considered. I've seen more harm done by "malloc(-1)"'s than any SIMD code in media processing.


Bad drivers and HW interaction have...
Forum: New and alternative video codecs 23rd June 2021, 10:21
Replies: 83
Views: 40,723
Posted By skal
There's actually 3 situations where intra blocks...

There's actually 3 situations where intra blocks are used:

a) Isolated intra-blocks in a P/B frame: they are used to fill-in "unpredictable" blocks (like: resolving silhouettes, unseen...
Forum: New and alternative video codecs 14th June 2021, 10:23
Replies: 83
Views: 40,723
Posted By skal
WebP2 is separate from WebP right now, as an...

WebP2 is separate from WebP right now, as an experimental effort. But it shares WebP's goal (and learnings): be good for the web/transfert case, at super-low bitrate (and not necessarily for archival...
Forum: New and alternative video codecs 11th June 2021, 10:39
Replies: 83
Views: 40,723
Posted By skal
Thanks for the report! Should be fixed now.

Thanks for the report! Should be fixed now.
Forum: New and alternative video codecs 23rd December 2020, 13:25
Replies: 83
Views: 40,723
Posted By skal
That would be the ones with areas of highly...

That would be the ones with areas of highly different complexities (for instance the trees in 'Source du Pecher' use a lot of bits [~2bpp], whereas the wall on the left uses ~0.1bpp at max). Or the...
Forum: New and alternative video codecs 21st December 2020, 17:37
Replies: 83
Views: 40,723
Posted By skal
Btw, the latest commit...

Btw, the latest commit (https://chromium.googlesource.com/codecs/libwebp2/+/6b0aaad12b1134d4562583d327428efcfdb880a0) 6b0aaad of libwebp2 should now produce better results on the type of images...
Forum: New and alternative video codecs 9th December 2020, 22:11
Replies: 83
Views: 40,723
Posted By skal
For some other news, the 'Squoosh' app got...

For some other news, the 'Squoosh' app got updated right now, with WebP2 support: https://squoosh.app/
(amongst other codecs)
Forum: New and alternative video codecs 9th December 2020, 22:10
Replies: 83
Views: 40,723
Posted By skal
Yes, WebP2 is focussing on the low-bitrate...

Yes, WebP2 is focussing on the low-bitrate primarily.
But it doesn't mean that the 'medium' and 'large' cases are neglected!
Forum: New and alternative video codecs 9th December 2020, 14:43
Replies: 83
Views: 40,723
Posted By skal
WebP2 is based on recycled bricks from WebP-v1...

WebP2 is based on recycled bricks from WebP-v1 (lossless), along with elements from AV1 or similar, plus some new features (alpha, preview, ...) developed for the image use-case specifically.

For...
Forum: New and alternative video codecs 8th December 2020, 17:37
Replies: 83
Views: 40,723
Posted By skal
duly noted!

duly noted!
Forum: New and alternative video codecs 7th December 2020, 22:41
Replies: 83
Views: 40,723
Posted By skal
Jethro, 4:4:4 is pretty much the only...

Jethro,



4:4:4 is pretty much the only (internal) working space.
webp2 is able to use a mixed per-block 4:2:0 / 4:4:4 switch right now. But considering that 4:2:0 was invented for reducing...
Forum: New and alternative video codecs 7th December 2020, 20:23
Replies: 83
Views: 40,723
Posted By skal
That's quite interesting: does it look like...

That's quite interesting: does it look like PingoA+Brotli is the best tradeoff in size x time ?



thanks for spending time / watts testing this! Very useful.

skal/
Forum: New and alternative video codecs 7th December 2020, 00:14
Replies: 83
Views: 40,723
Posted By skal
The special tool extras/ewp2 can handle Y4M files...

The special tool extras/ewp2 can handle Y4M files with higher bit-depth samples.

./extras/ewp2 -h
Usage:
ewp2 in_file [-o out_file] [options]

Options valid if 'out_file' has the .wp2 or...
Forum: New and alternative video codecs 5th December 2020, 00:07
Replies: 83
Views: 40,723
Posted By skal
Thanks! Could you upload image_21447.ppm...

Thanks! Could you upload image_21447.ppm somewhere please?
(or on the bug-tracker https://bugs.chromium.org/p/webp2, even)
Forum: New and alternative video codecs 3rd December 2020, 23:15
Replies: 83
Views: 40,723
Posted By skal
thanks for testing -> should be fixed now,...

thanks for testing -> should be fixed now, hopefully!
Forum: New and alternative video codecs 3rd December 2020, 22:30
Replies: 83
Views: 40,723
Posted By skal
Regarding WebP2's triangle-based compression for...

Regarding WebP2's triangle-based compression for previews, i've set up a demo page you might find amusing here:

https://codepen.io/skal65535/project/full/ZwnQWM

You can visualize the...
Forum: New and alternative video codecs 3rd December 2020, 22:26
Replies: 83
Views: 40,723
Posted By skal
Yes, lossless Photos are still on the radar,...

Yes, lossless Photos are still on the radar, although probably less than -say- lossless coding of game assets (which are photo-like, sometimes!).

Tiles should help regarding decoding speed of...
Forum: New and alternative video codecs 25th November 2020, 20:22
Replies: 83
Views: 40,723
Posted By skal
looks like we need a replacement for...

looks like we need a replacement for setenv/getenv under Windows env. Thanks for pointing this out!
Forum: New and alternative video codecs 25th November 2020, 18:15
Replies: 83
Views: 40,723
Posted By skal
latest submit 7c0dceb...

latest submit 7c0dceb (https://chromium-review.googlesource.com/c/codecs/libwebp2/+/2560101) should fix the %zu problem.

It also introduced some ~10-15% speed-up on x86 contribution (thanks Ilya!)...
Forum: New and alternative video codecs 25th November 2020, 08:13
Replies: 83
Views: 40,723
Posted By skal
Hard to say without more details, the source...

Hard to say without more details, the source image, compile flags, exact libtiff library version used, etc.

Best is to open an issue on the bug tracker...
Forum: New and alternative video codecs 24th November 2020, 16:58
Replies: 83
Views: 40,723
Posted By skal
Thanks for the report, opened an issue...

Thanks for the report, opened an issue (https://bugs.chromium.org/p/webp2/issues/detail?id=5) for it.
Forum: New and alternative video codecs 24th November 2020, 12:27
Replies: 83
Views: 40,723
Posted By skal
Sorry, i'm not an avifenc/avifdec specialist,...

Sorry, i'm not an avifenc/avifdec specialist, just tried it quickly on Unix.


If you are interesting in non-8bit input/output, you can have a look at some tools in the 'extras...
Forum: New and alternative video codecs 24th November 2020, 07:47
Replies: 83
Views: 40,723
Posted By skal
That's expected: you cannot save to a lossy...

That's expected: you cannot save to a lossy format (jpg, webp), since it would defeat the purpose of showcasing WP2's compression capabilities.
Forum: New and alternative video codecs 23rd November 2020, 23:39
Replies: 83
Views: 40,723
Posted By skal
Hmm... if you missed the last 10 years of WebP...

Hmm... if you missed the last 10 years of WebP development, i made a recap presentation here: http://shorturl.at/BEMV8

And yes, it's used a lot.
Forum: New and alternative video codecs 23rd November 2020, 15:48
Replies: 83
Views: 40,723
Posted By skal
Btw, for definiteness here are some command line...

Btw, for definiteness here are some command line examples if you want to test encoding / decoding:

cwp2 cat.png -o cat.wp2 -d cat.wp2.png -q 44

avifenc --min 40 --max 40 -s 2 cat.png cat.avif...
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