AV1

New audio container for spatial audio and ambisonics.

The attached screenshot is the mod of this community.

So far, it seems efforts to work on this community are going to cease due to shortcomings of both the Lemmy.world lemmy instance & the mod's frustration with these issues. So, I'd encourage you to check out the AV1 community on lemmy.ml until things change here either with lemmy.world as a whole or the mod's interests

I've been experimenting with AV1 using FFmpeg with SVT-AV1 for 2 years. I've encoded quite a lot of my videos in AV1 by now, mostly just animated content.

AV1 is really good for an open source project, no doubt about that. But after so long using it, I can safely say that it is really just good for storage saving with excellent quality-speed tradeoff, however, it lacks fidelity. My major discontent with AV1 has been how the encoder blurs some details completely out even when setting crf as low as 14 whereas HEVC doesn't at all. Edit: Also in some instances, particularly with non-animated videos, AV1 performed way worse than HEVC which I believe is due to it doing a poor job in varied and difficult scenes.

At first, I thought AV1 is only better for animated videos but later I found its really just any video so I've switched back to using HEVC for storage and decided to use AV1 only with preset 6 and fast decode on for mobile devices.

I don't mean to say that AV1 is bad, it does provide better quality than HEVC for sure but I wouldn't call that an upgrade when HEVC still has the major edge in fidelity.

It makes sense for VOD services to make use of it but personally, I wouldn't use it for anything except quick and super low bitrate encoding.... for now.

I'm trying to get some pictures onto my Android phone with >8bpp depth and without the large file sizes of png and the like.

Android 12 supports avif, and that's great: https://developer.android.com/about/versions/12/features

I'm using a Samsung phone with Android 13, that sounds great too concerning avif support. Unfortunately it doesn't seem to work, only web browsers and the basic, dedicated app "AVIF Viewer" are able to open the .avif files - every other viewer app, Samsung built-in or external, doesn't.

Alas, avif support seems to be on the same level as jpeg-xl (works in browsers and one dedicated app). 12-bit legacy jpeg doesn't seem to be supported either.

=> Has anyone managed to find a viewer app with browsing feature (swipe to change pictures) that supports avif, or to convince Samsung's built-in apps to display .avif files?

Ffmpeg AV1 is a fantastic codec. Open and promising a better compression ratio than HEVC / AVC.

However I am unclear right now about the possible CRF settings.

x264 defaults to a CRF of 23 x265 defaults to a CRF to 28

These two seem to have a similar visual quality for me.

What is the corresponding CRF for AV1 – what CRF has a similar quality and what is the default?

Please excuse if this question was asked before. I googled and searched reddit. However I only found complicated answers wits PSNR etc but no simply estimate answer.

I'm not going to link it here. But there's a recent article on Streaming Media dot com proclaiming that there is some 3rd parties claiming that AV1 infringes patents. And some how Sisvel conned 51 outfits out of licensing royalties. Some how this big vapor legal battle is supposed to unfold that never came.

https://gitlab.com/AOMediaCodec/avm/-/commit/6c74d9b1b2566e9b0c735dcb1a21858f24a00298

C076_inter_mode_ctx C076 inter mode contexts

https://gitlab.com/AOMediaCodec/avm/-/merge_requests/781 https://gitlab.com/AOMediaCodec/avm/-/issues/166

Tutorial to how encode a video https://www.nxrte.com/jishu/11119.html#group=nogroup&photo=0

01/06/2023 18:40 https://www.oxfordlearnersdictionaries.com/definition/english/trade-off_2?q=trade-off

01/06/2023 https://www.bloomberg.com/press-releases/2023-06-01/alliance-for-open-media-s-volumetric-visual-media-working-group-opens-call-for-proposals-on-static-polygonal-mesh-coding The important part is this High quality of the 3d graphics Will be downloaded here Will be they anonymezed until Junpstart Other words are just fillers

https://cloud.tencent.com/developer/user/1601916 tencent news about codecs

An Open Video Dataset for Screen Content Coding https://ieeexplore.ieee.org/document/10017995 https://cloud.tencent.com/developer/article/2260936?areaSource=&traceId= Y. Wang Daede 2022 IEE

https://codecwar.com/compare/summary?id=07f9479cf20536da0e46190033e71e08 Comparison page Codecs Comparative Report

https://www.nxrte.com/jishu/6022.html#group=nogroup&photo=0 8K OTT Source: Coal Mine Factory Technical Articles

https://ca.linkedin.com/in/danilovucetic

Software Engineering Intern, Masters Google

Sep 2022 - Dec 20224 months

Mountain View, California, United States

Researched lightweight deep learning approaches for video restoration in the AV2 codec, generating multiple models capable of increasing quality (PSNR gain) by up to 2.5%.

Developed a method to generate quantized weights for linear combinations of output channels, called encoder-guided restoration, leading to improvements in codec performance of up to 2%.

Investigated distillation as a method of achieving highly efficient and effective models for video restoration.

Explanation to VVC https://www.nxrte.com/jishu/10757.html#group=nogroup&photo=0 Codec • Source: Technical Articles

Evolution of codec, Ali266 unlocks new growth in the field of ultra-high-definition video Codec • Source: Video Cloud Technology • February 1, 2023 at 5:04 pm • Technical Articles

https://bloggeek.me/rtcscale-2023/#h-niklas-enbom-meta-av1-for-meta-rtc Sriram Srinivasan / Meta – Real-time audio at Meta Scale audio WebRTC Niklas Enbom / Meta – AV1 for Meta RTC An integrator's perspective. Meta will adopt AV2

livevideostack in the early 2017 https://www-livevideostack-cn.translate.goog/news/2023-codec/?_x_tr_sl=auto&_x_tr_tl=en&_x_tr_hl=it&_x_tr_pto=wapp https://vcgit.hhi.fraunhofer.de/ecm/ECM https://sh2022.livevideostack.cn/

I tried to run Av1an docker image on my Ubuntu 22.04 machine with the following:

docker run --privileged -v "$(pwd):/videos" --user $(id -u):$(id -g) -it --rm masterofzen/av1an:latest -i input.mkv

However, the following error occured:

thread 'main' panicked at 'Input file "input.mkv" does not exist!', av1an-core/src/lib.rs:1206:5

The current directory in the terminal is the directory where input.mkv is stored in. So running pwd should have mounted the directory with the input.mkv to /videos. I also set mode for input.mkv to 777 just in case.