unlord

7 ms·

1.
by unlord 1y ago
> People don’t develop video codecs for fun like they do with software. And the reason is that it’s almost impossible to do without support from the industry. As someone who lead an open source team (of majority volunteers) for nearly a
2.
by unlord 1y ago
Someone asked about benchmarks, so I ran these just now to bring data to the discussion: nathan@arm1:~/git/rav1d.new/target$ hyperfine --warmup 2 "release/dav1d -q -i ~/Chimera-AV1-8bit-1920x1080-6736kbps.i
3.
by unlord 2y ago
It is actually quite a bit more misleading. I was not able to reproduce these numbers on Zen2 hardware, see https://people.videolan.org/~unlord/dav1d_6tap.png . I spoke with the slide author and he confirmed he was usin
4.
by unlord 2y ago
Encoding speed is not really a concern for web uses, where the image is decoded potentially millions or even billions of times more than it is encoded. I agree, PSNR is a terrible measure of quality. The study "Benchmarking JPEG XL los
5.
by unlord 2y ago
> Have you seen this more recent data that includes AVIF? https://cloudinary.com/labs/cid22 The graph from Cloudinary uses libaom to do the encoding at speed preset 7 (aom s7), which is far from speed preset 0 and d
6.
by unlord 2y ago
> While that most definitely is a consideration, AVIF lacks many features and much of the functionality offered by JPEG XL. What features are these? You have not named a single concrete advantage. The places where AVIF out-performs JPEG
7.
by unlord 2y ago
> Regarding JPEG XL's mobile support, it makes sense it would see limited development if the company that manages one of the biggest mobile players has been the greatest restriction on their success. The lack of support also disince
8.
by unlord 2y ago
The article claims that "Google wants control, and JPEG XL could take that away from them" however this is disingenuous. The JPEG XL format was co-authored by Google employees, and they have just as much say over the direction o
9.
by unlord 3y ago
> If you avoid it then you won't be using RISC-V at all, right now. I'm sorry this just isn't true. The K230 has RVV 1.0 hardware and has been available for 5 months. > Which matters much less than it used to, as gcc 14
10.
by unlord 5y ago
Note that AVIF is not just AV1 video keyframes. The entire compliment of AV1 video coding tools (including inter prediction with motion vectors) are available. This includes spatial and temporal scaling. Note this means that animated images
11.
Video encoder rollback optimization in rav1e(dev.to)
7 points by unlord 6y ago|0 comments
12.
by unlord 6y ago
Yes, and in fact you can see a demo of dav1d compiled to wasm here: http://jabberfr.org/tmp/ogv.js/ Note this works fine in desktop and mobile Safari.
13.
by unlord 6y ago
> But I think it should be noted the HM and VTM are reference encoder and decoder, they are not meant to be used for production nor in any way optimised. Sure, but my comparison was to the Ittiam production decoder.
14.
by unlord 6y ago
> It really is the state of the art Video Codec, at a decoding complexity that is quite manageable. ( Lower than AV1 ) I am afraid this has not been substantiated by any of the public decoder demonstrations I've seen. Please see th
15.
by unlord 6y ago
You may be interested in reading the license page for the royalty-free Opus audio codec: https://opus-codec.org/license/ Full disclosure, I am a member of the Xiph.Org Foundation.
16.
by unlord 7y ago
Please see the W3C Patent Policy regarding Web standards. https://www.w3.org/Consortium/Patent-Policy-20040205/ > The goal of this policy is to assure that Recommendations produced under this policy can be impl
17.
by unlord 7y ago
Yes, there is at least one third party patent license administrator for JPEG-XT: https://www.sisvel.com/licensing-programs/digital-video-disp...
18.
by unlord 7y ago
> It’ll be interesting to see if we find out more info and are able to test this encoder in the coming months. You won't have to wait long, more information will be coming out later this month. I manage the codec engineering team a
19.
by unlord 8y ago
What you are referring to is the encoding time using the libaom reference encoder, which was developed as a research code base to test bitstream features. AV1 (the format) was designed to be used for a variety of use cases including real-t