Gianni Rosato

Hey everyone! fmetrics, a fast open-source perceptual metrics toolkit that runs on the CPU, is here: https://github.com/halidecx/fmetrics fmetrics includes support for IW-SSIM, MS-SSIM, CVVDP (via fcvvdp), SSIMULACRA2, & Butteraugli. All are faster than their reference implementations while maintaining competitive MOS correlation – see the blog post (https://halide.cx/blog/fmetrics) for more info. All code is Apache 2.0. Enjoy!!

Making Software: Image Compression
https://www.makingsoftware.com/chapters/image-compression

Cool to see WebP addressed here too!

fcvvdp 0.2.0! https://github.com/halidecx/fcvvdp/releases/tag/0.2.0

Highlights: ~9-12% speed boost for single-threaded, task threading (220% faster than the reference implementation with 8 threads on my 13700k), FFmpeg support via patch. Check it out and lmk what you think!

@barrbrain@floss.social wow, definitely going to look into this, thanks! Very cool!!

New Halide blog post on post-processing for chroma as it is relevant to compression efficiency: https://halide.cx/blog/chroma-handling

Seems like you can get a roughly 2% efficiency improvement with 4:2:0 decoder output just with smarter post-processing for chroma. Pretty neat!

#avif #webp #jpeg #transcoding #compression

@rachelplusplus@tech.lgbt Best of luck, I’ve consistently been a big fan of all of your image compression blog posts!

SVT-AV1 4.0.0 is here!
Changelog: https://gitlab.com/AOMediaCodec/SVT-AV1/-/releases/v4.0.0
SVT-AV1-PSY's porting efforts are fully complete, and this release also features huge AVIF improvements. Maybe the most exciting release to date by my standards – SVT-AV1 is finally a real perceptual encoder!

#av1 #avif #compression

Happy Holidays! Introducing fcvvdp, a faster CVVDP implementation: https://github.com/halidecx/fcvvdp

Compared to the reference implementation running on the CPU, fcvvdp is faster (~15%) despite being single-threaded. It sees stronger wins with user time (up to ~15x) and memory usage (>90% less memory).

#compression #av1 #video

I spoke with Julio Barba at VideoLAN Dev Days in London!

Here are our slides, discussing SVT-AV1-PSY: https://giannirosato.com/files/svt-av1-psy_vdd_2025.pdf

I'll find access to the video & post it soon!

#av1 #avif #ffmpeg #vdd

Introducing oavif: faster target quality image compression

https://giannirosato.com/blog/post/oavif/

oavif can be up to 63% faster than traditional target quality encoders. Learn how in the attached blog post!

#av1 #avif #compression

fssimu2 has its first release! https://github.com/gianni-rosato/fssimu2/releases/tag/0.1.0

fssimu2 is a fast SSIMULACRA2 implementation in Zig, with support for distortion map output. It is ~23% faster than the reference implementation at ~40% less memory usage, while being 99.97% accurate. Give it a look if you're interested!

New Halide blog post!

https://halide.cx/blog/consistency

Quality and speed define an image encoder's compression performance. Consistency is a close third, and easily overlooked in image encoder design. What value does it provide, and how can we measure it?

#avif #webp #jxl #jpegxl #compression

@thelinuxEXP@mastodon.social I hope this doesn’t mean schools switch en masse to local MS Office … would feel like a step in the wrong direction. Libreoffice FTW