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Search took 0.00 seconds. Search: Posts Made By: benwaggoner
Forum: New and alternative video codecs 27th July 2023, 19:02
Replies: 175
Views: 96,497
Posted By benwaggoner
Yeah, 512x512 is really a thumbnail image size...

Yeah, 512x512 is really a thumbnail image size these days. Smaller thumbnails have value in many applications, but they're not the "main thing" people are optimizing for.
Forum: New and alternative video codecs 17th May 2023, 18:57
Replies: 175
Views: 96,497
Posted By benwaggoner
Early-stage encoders, and reference encoders in...

Early-stage encoders, and reference encoders in general, tend to be very tuned for metrics without much psychovisual optimization. They're also optimized for moving images more than still frames.
...
Forum: New and alternative video codecs 4th February 2023, 00:00
Replies: 175
Views: 96,497
Posted By benwaggoner
That's absolutely the tension in practical...

That's absolutely the tension in practical encoder development and tuning. Golden eyeball hours are really expensive and scarce, with metrics orders of magnitude cheaper. So, how do you make things...
Forum: New and alternative video codecs 4th January 2023, 18:45
Replies: 175
Views: 96,497
Posted By benwaggoner
My understanding is that the original VMAF was...

My understanding is that the original VMAF was trained only on x264 encodes, mainly with variation in CRF and frame size. I would hope Netflix has incorporated other codecs and a broader set of...
Forum: New and alternative video codecs 3rd January 2023, 19:12
Replies: 175
Views: 96,497
Posted By benwaggoner
That was originally true about VMAF, but more...

That was originally true about VMAF, but more recent versions have a mode to turn off the extra contrast bias. Since VMAF is a machine learning model trained on subjective ratings, updated subjective...
Forum: New and alternative video codecs 5th November 2022, 00:11
Replies: 175
Views: 96,497
Posted By benwaggoner
AOM seems to care about VMAF as well, which is...

AOM seems to care about VMAF as well, which is the least-bad broadly available metric. But not even VMAF solves the problem of how to score temporal variations in quality, like I or B frame strobing....
Forum: New and alternative video codecs 26th January 2022, 18:18
Replies: 175
Views: 96,497
Posted By benwaggoner
Yeah, there's a big impact of personal preference...

Yeah, there's a big impact of personal preference on psychovisual tradeoffs. People definitely tune for personal preference, and then prefer their own tunings. That's a big reason double-blind MOS...
Forum: New and alternative video codecs 12th August 2021, 23:28
Replies: 175
Views: 96,497
Posted By benwaggoner
The challenge is that wavelet transforms for...

The challenge is that wavelet transforms for interframe encoding have been tried many times, and have never resulted in anything competitive with block-based encoding and motion estimation. So unless...
Forum: New and alternative video codecs 11th August 2021, 21:17
Replies: 175
Views: 96,497
Posted By benwaggoner
I believe that project is focused on lowering...

I believe that project is focused on lowering ENCODING time for video codecs. This would be stuff like the ASICs YouTube is building. Pixels-per-second/watt is quite important for UGC like FaceBook...
Forum: New and alternative video codecs 5th August 2021, 23:48
Replies: 175
Views: 96,497
Posted By benwaggoner
I don't directly deal with the amazon.com catalog...

I don't directly deal with the amazon.com catalog side of things, but I do imagine we account for a material share of all images delivered globally. How does NHW compare to AVIF and HEIF H.264 for...
Forum: New and alternative video codecs 4th August 2021, 23:53
Replies: 175
Views: 96,497
Posted By benwaggoner
That said, I am certainly able to pass on the...

That said, I am certainly able to pass on the perspective of video experts to people inside Amazon.
Forum: New and alternative video codecs 3rd August 2021, 20:52
Replies: 175
Views: 96,497
Posted By benwaggoner
Your best bet to do something with NHW is to make...

Your best bet to do something with NHW is to make a JavaScript-compatible implementation of it so people can view the files without needing to use extra software. That would encourage experimentation...
Forum: New and alternative video codecs 3rd August 2021, 18:31
Replies: 175
Views: 96,497
Posted By benwaggoner
The "neatness" aspect wouldn't be appealing to...

The "neatness" aspect wouldn't be appealing to the mezzanine market at all. The goal of a mezzanine codec is to serve as a high quality input to additional filtering and then recompression with...
Forum: New and alternative video codecs 30th July 2021, 20:23
Replies: 175
Views: 96,497
Posted By benwaggoner
I can see places where AI can absolutely enhance...

I can see places where AI can absolutely enhance encoding. We're seeing ML-enhanced encoders already, and ML-enhanced scalers for improved playback. ML improvements to various in-loop filters are...
Forum: New and alternative video codecs 28th July 2021, 20:50
Replies: 175
Views: 96,497
Posted By benwaggoner
Yeah, lots more tools get proposed for codecs...

Yeah, lots more tools get proposed for codecs than get adopted. And psychovisual optimization only tools get looked at later in development.

In proposing a new intra coding approach, it's...
Forum: New and alternative video codecs 17th July 2021, 22:54
Replies: 175
Views: 96,497
Posted By benwaggoner
Alas, subjective evaluation comes after PSNR...

Alas, subjective evaluation comes after PSNR evaluation. VMAF seems to be used more and more, but has its own limitations (like not being able to accurately score adaptive quantization).

The...
Forum: New and alternative video codecs 15th July 2021, 23:57
Replies: 175
Views: 96,497
Posted By benwaggoner
AOM definitely does not prioritize "extremely...

AOM definitely does not prioritize "extremely fast" ;). And the whole VPx and libaom/libvpx architecture was very PSNR focused back to the On2 days. I think they would struggle to integrate any tools...
Forum: New and alternative video codecs 15th July 2021, 22:25
Replies: 175
Views: 96,497
Posted By benwaggoner
AV2 is in early development, and this would be a...

AV2 is in early development, and this would be a good time to make contributions as part of that standards process.
Forum: New and alternative video codecs 15th July 2021, 17:23
Replies: 175
Views: 96,497
Posted By benwaggoner
Any codec, video, audio, or still, needs to...

Any codec, video, audio, or still, needs to gracefully degrade when out of its sweet spot. The sheer variety of content out there is mind-boggling, and all the common image test libraries lack...
Forum: New and alternative video codecs 15th July 2021, 01:22
Replies: 175
Views: 96,497
Posted By benwaggoner
Preprocessing in encoding is a philosophical...

Preprocessing in encoding is a philosophical question as much as any. I tend to stay away from it unless the preprocessing actually improves net accuracy of the final encode.

There was a kerfuffle...
Forum: New and alternative video codecs 14th June 2021, 20:36
Replies: 175
Views: 96,497
Posted By benwaggoner
HEVC and VVC are also better-suited for parallel...

HEVC and VVC are also better-suited for parallel processing and SIMD in decoding single frames than older codecs. With Wavefront Parallel Processing, you can get one thread per 64 lines of the frame....
Forum: New and alternative video codecs 11th June 2021, 21:16
Replies: 175
Views: 96,497
Posted By benwaggoner
Wow, a minute for how big an image? I don't...

Wow, a minute for how big an image?

I don't sweat reference encoder speed much, because there are hugely unoptimized. I'm sure intra-only will be 100x faster in practical implementations. And...
Forum: New and alternative video codecs 28th May 2021, 00:46
Replies: 175
Views: 96,497
Posted By benwaggoner
Yeah, the problem with the whole VPx series that...

Yeah, the problem with the whole VPx series that AV1 inherited is that On2 had a PSNR-Above-All ethos for their encoders, believing that was the key thing that would drive adoption of their codecs....
Forum: New and alternative video codecs 17th May 2021, 21:11
Replies: 175
Views: 96,497
Posted By benwaggoner
No problem. I generally find HEIC to do well as a...

No problem. I generally find HEIC to do well as a JPEG superset, particularly in its ability to do nice sharp edges. Using --tskip can help a lot with mixed natural/synthetic content.
Forum: New and alternative video codecs 14th May 2021, 22:30
Replies: 175
Views: 96,497
Posted By benwaggoner
Oh, I think there's a very real chance that VVC...

Oh, I think there's a very real chance that VVC might get traction as an image codec! But getting broad decoder support is a precondition, and is mainly driven by video use cases.


The...
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