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

SVT-AV1-HDR 3.1.3 "Cyclonus" is out! Including all-new features from SVT-AV1, plus code cleanups and stability fixes. Get the newest version of this all-purpose AV1 video encoder! ffmpeg and HandBrake builds are available by clicking the link below: github.com/juliobbv-p/s...

Enhancing HDR on Instagram for iOS With Dolby Vision: https://engineering.fb.com/2025/11/17/ios/enhancing-hdr-on-instagram-for-ios-with-dolby-vision/ #av1 #vp9 #hdr

I spoke with @juliobbv.bsky.social at VideoLAN Dev Days in London! Here are our slides, discussing SVT-AV1-PSY: giannirosato.com/files/svt-av... I'll find access to the video & post it soon!

Introducing oavif: faster target quality image compression giannirosato.com/blog/post/oa... 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! github.com/gianni-rosat... 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! halide.cx/blog/consist... 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

The Halide Compression website (halide.cx) now has an Atom feed – just paste the URL into your favorite RSS reader and you should be good to go!

New blog post about my experiences using spark.js with three.js: www.ludicon.com/castano/blog... Re-posts and feedback appreciated!

Anyone using rss/atom readers can now type `giannirosato.com` into their reader to get my website's atom feed

I got to interview Julio Barba from Google for the Halide blog: halide.cx/blog/julio-b... Go check it out if you're interested in what the next decade of multimedia tech might look like!

Completely redesigned my website with Zola (www.getzola.org) – check it out at giannirosato.com Let me know if any links are broken if you link to my site – it should be fully backwards compatible with my old link hierarchy

The “AV1 is a disaster” myth Here’s what’s actually true: - SVT-AV1 is fast, fully multithreaded and packed with SIMD. - It scales beautifully on modern CPUs. - It beats x264, x265, and VP9 in bitrate vs runtime. AV1 on CPU isn’t a disaster. It’s quietly winning.

Tune 3: Still Picture is coming to SVT-AV1: https://gitlab.com/AOMediaCodec/SVT-AV1/-/merge_requests/2489#note_2704093242 Formerly Tune 4 in SVT-AV1-PSY. Thank you @juliobbv.bsky.social#note_2704093242!

Exciting #avif news – libaom’s tune iq (derived from SVT-AV1-PSY’s Tune 4) is used across The Guardian’s website now. They say they serve mostly AVIF, with JPEG XL shipped when supported. Very exciting stuff! Thanks @juliobbv.bsky.social!

New post! After my previous post about image compression, a few people asked me to try different encoder settings. So I went ahead and tested a couple of them :) www.rachelplusplus.me.uk/blog/2025/07...

Improving AVIF in Open Source via the Halide blog halide.cx/blog/improvi... I wanted to write this to explain some of what went into Tune 4/Tune IQ, & help outline some of my reasoning for starting Halide Compression in the first place. I hope you enjoy! #av1 #avif #encoding

Introducing Iris-WebP, a better WebP encoder: halide.cx/iris/index.h... Iris offers up to >20% better compression than libwebp, and trades blows with libaom for AVIF. My goal is to build an image-first encoder ecosystem for the modern Web, so that new web image codecs aren't generally superfluous.

AV1 @ Scale: Film Grain Synthesis, The Awakening netflixtechblog.com/av1-scale-fi...

The world’s largest digital camera — which will create an unparalleled map of the night sky — is at the heart of the new Vera C. Rubin Observatory in Chile. Here’s how it works. nyti.ms/4n8OpgP

"I designed my own ridiculously fast game streaming video codec – PyroWave" themaister.net/blog/2025/06... Cool to see github.com/psy-ex/metrics in use in the wild, I'm glad it was useful!

New blog post: I've spent the last couple of months building a tool to compare different image encoders, and wrote an article about some of the things you need to consider to get reliable results. I also talk a bit about how JPEG-XL is looking promising! www.rachelplusplus.me.uk/blog/2025/06...

Help restore the tax deduction for software dev in the US (Section 174) news.ycombinator.com/item?id=4422... If you live in the US and you've ever used a piece of software, you're probably interested in this. There's a sign-able letter attached.

May have bitten off quite a lot with this next blog post, but the goal is in sight! Basically built an encoder comparison tool from scratch, to really nail down the details in my own mind. Should have some interesting things to say soon - think of it as a "yes, and" to Gianni's excellent post:

There's simply no way

Lil' teaser for an upcoming blog post, building on my last post (www.rachelplusplus.me.uk/blog/2025/03...): This graph compares compressing an image at a single fixed resolution (dotted curve) vs. encoding at multiple resolutions, netflix style (solid curve):

'Spilling and smearing' 2025, Jon Sneyers, image/jxl, 31 bytes #jxlart jxl-art.lucaversari.it?zcode=c8osSU...

Very good article explaining entropy from an information theory perspective – highly recommend reading if you’re interested: https://jasonfantl.com/posts/What-is-Entropy/

Updated numbers for Eve-AV1 & Eve-VP9 are public! The last time they were updated was around 2019, so this should give a more relevant look at how they perform. It takes a lot to improve a mature video encoder, and I'm very impressed with the Eve lineup. Shout-out @luctrudeau.bsky.social! #av1

Globalizing Productions with Netflix’s Media Production Suite netflixtechblog.com/globalizing-...

The real headline isn’t #HDR10+. It’s that #AV1 is about to become the most streamed codec at #Netflix "AV1-SDR is already the second most streamed codec at Netflix, behind H.264 [...] we expect the day is not far when AV1 will be the most streamed codec at Netflix" Quiet shift. Big milestone.

In addition to HDR10 and Dolby Vision, Netflix now also streams content in HDR10+ format, encoded in AV1, on compatible devices. It appears that Netflix has been waiting to adopt AV1 beyond SDR until it could do so with HDR10+. flatpanelshd.com/news.php?sub...

I've set up a starter pack on Video Tech. Please share and let me know if you're interested in joining. Thanks! go.bsky.app/KMv5Lid

Hey Bluesky! I’m Luc, a video compression researcher near Montreal. Coauthored AV1 and co-designed the dav1d decoder. Expect AV1 content, news, coding tricks, and memes. #AV1 #VideoCompression #OpenSource

GNOME 48 is here! https://release.gnome.org/48/

The last part of my AV1 encoder series is now up! Today we're looking at how it compares to existing AV1 and JPEG encoders, how using Rust for this project went, and where I might take this in future: www.rachelplusplus.me.uk/blog/2025/03...

New blog post is up! https://giannirosato.com/blog/post/comparing-encoders/ Comparing video encoders is easy, but often done incorrectly. We have good tools & a process, so it should be simpler from now on. #av1 #video #compression #encoding

working on a cute little algorithmic art tool made with svelte & webgpu

This is the single best article on color spaces I have seen around. Well written, well informed and illustrated with interactive visualizations. Truly brilliant work by Eric Portis! ericportis.com/posts/2024/o...

This is so cool!!! I've been excitedly following your tinyavif blog posts – keep it up!

Jpegli works in PDF pdfa.org/jpegli-works... Not that crazy of course, but cool to see jpegli getting coverage :)

If anyone has any idea, I would love to know what the transcoding pipeline looks like for Bluesky's video posts, because they really don't look good at all

I find it frustrating how hard it is to do photos and photo-adjacent videos without being exclusively limited to either of two buckets: 1) Only ever take pictures on an iPhone and only ever view them in Apple Photos. 2) Only ever take sRGB photos and Rec. 709 video on a dedicated camera and […]

SVT-AV1-PSY v2.3.0-B is here! The release notes are public on the SVT-AV1-PSY website: svt-av1-psy.com/releases/#v2... I'm super happy the team has continued work on this tool even as I’ve left the project. Very excited to see continued development! #av1 #encoding #video

Running Private DeepSeek R1 with Verifiable Security: https://tinfoil.sh/blog/2025-02-03-running-private-deepseek Many people are (rightfully) worried about the access AI service providers have to user data. Tinfoil appears to fix this problem for everyone using AI in the cloud. #ai #llm #deepseek