"Set for a year-end release, AV2 is not only an upgrade to the widely adopted AV1 but also a foundational piece of AOMedia’s future tech stack.
AV2, a generation leap in open video coding and the answer to the world’s growing streaming demands, delivers significantly better compression performance than AV1. AV2 provides enhanced support for AR/VR applications, split-screen delivery of multiple programs, improved handling of screen content, and an ability to operate over a wider visual quality range. AV2 marks a milestone on the path to an open, innovative future of media experiences."
I want to agree with you and I do to a large extend. I like new codecs and having more opensourcy coded is better than using a codec that has many patents. long term patents(current situation) slows technological progress.
what I don’t agree with you is some details.
first, Netflix youtube and so on need low bitrate and they (specially google/youtube) don’t care that much about quality. google youtube video are really bit starved for their resolutions. netflix is a bit better.
second, many people when they discuss codecs they are referring to a different use case for them. they are talking about archiving. as in, the best quality codec at a same size. so they compare original (raw video, no lossy codec used) with encoded ones. their conclusion is that av1 is great for size reduction, but cant beat h264 for fidelity at any size. I think that h264 has a placebo or transparent profile but av1 doesn’t.
so when I download a fi…I mean a linux ISO from torrents, I usually go for newest codec. but recently I don’t go for the smallest size because it takes away from details in the picture.
but if I want to archive a movie (that I like a lot, which is rare) I get the bigger h264 (or if uhd blueray h265).
third: a lot of people’s idea of codec quality is formed based on downloading or streaming other people’s encoded videos and they themself don’t compare the quality (as they don’t have time or a good raw video to compare).
4th: I have heard av1 has issues with film grain, as in it removes them. film grain is an artifact of physical films (non-digital) that unfortunately many directors try (or used to) to duplicate because they grew up watching movies on films and think that movies should be like so they add them in in post production. even though it is literally a defect and even human eyes doesn’t duplicate it so it is not even natural. but this still is a bug of av1 (if I read correctly) because codec should go for high fidelity and not high smoothness.
AV1 has issues with film grain. There are things you can do. Let me admit however that one movie that I have not encoded as AV1 is a restored version of the original Star Wars. And film grain is a contributor to that.
Another thing about film grain though is that it is often artificially added after as you say. With AV1, you can often get amazing compression that removes the grain as a side-effect and then just add it back yourself. To each their own how they feel about this approach.
I also agree that H.264 can be more transparent. However, that is at massive file sizes. Others may have the space for that but I do not… Perhaps I do mot have the eyes for it either. I am not extracting and comparing single frames. To me, the AV1 files that I have look better at the size that I am archiving than they would using any other codec.
I use the fact that massive bit rate H.264 looks great to my advantage as that is what my AV1 is being transcoded into when I watch it most of the time.
Some content compresses better than others. Sometimes I get massive size reductions with AV1 at what looks like great quality to me. Other times, it struggles to beat H.265 or even H.264 at similar quality. It is pretty rare that I do not choose AV1 though.
I often use Netflix VMAF to get an idea of target compression. It is not perfect though. You have to verify visually. Saves time trialing different parameters though.
I should say that the audio codec is another big factor. I typically pair AV1 with Opus audio and the size reductions there are amazing even at quality levels that are transparent to me.
If AV2 offers better quality at the same size, or similar quality at smaller sizes, I will likely switch to it long before having hardware that can play it natively.