AV1: Difference between revisions

libaom
Developer(s)	Alliance for Open Media
Stable release	3.9.1 / 5 June 2024;; 6 months ago
Written in	C, assembly
License	BSD 2-Clause License (free software)
Website	aomedia.googlesource.com/aom

AOMedia Video 1
Internet media type	video/AV1,; video/webm
Developed by	Alliance for Open Media
Initial release	28 March 2018 (6 years ago)
Latest release	1.0.0 Errata 1; 8 January 2019 (5 years ago)
Type of format	Video coding format
Contained by	Matroska; WebM (nonstandard); ISOBMFF; RTP (WebRTC);
Extended from	VP10; Daala; Thor;
Standard	AOM AV1
Open format?	Yes
Free format?	See § Patent claims
Website	aomedia.org/av1-features/

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AOMedia Video 1 (AV1) is an open, royalty-free video coding format initially designed for video transmissions over the Internet. It was developed as a successor to VP9 by the Alliance for Open Media (AOMedia),^[2] a consortium founded in 2015 that includes semiconductor firms, video on demand providers, video content producers, software development companies and web browser vendors. The AV1 bitstream specification includes a reference video codec.^[1] In 2018, Facebook conducted testing that approximated real-world conditions, and the AV1 reference encoder achieved 34%, 46.2%, and 50.3% higher data compression than libvpx-vp9, x264 High profile, and x264 Main profile respectively.^[3]

Like VP9, but unlike H.264 (AVC) and H.265 (HEVC), AV1 has a royalty-free licensing model that does not hinder adoption in open-source projects.^[4]^[5]^[6]^[7]^[2]^[8]

AVIF is an image file format that uses AV1 compression algorithms.

History

AV1 logo prior to 2018

The Alliance's motivations for creating AV1 included the high cost and uncertainty involved with the patent licensing of HEVC, the MPEG-designed codec expected to succeed AVC.^[9]^[7] Additionally, the Alliance's seven founding members – Amazon, Cisco, Google, Intel, Microsoft, Mozilla, and Netflix – announced that the initial focus of the video format would be delivery of high-quality web video.^[10] The official announcement of AV1 came with the press release on the formation of the Alliance for Open Media on 1 September 2015. Only 42 days before, on 21 July 2015, HEVC Advance's initial licensing offer was announced to be an increase over the royalty fees of its predecessor, AVC.^[11] In addition to the increased cost, the complexity of the licensing process increased with HEVC. Unlike previous MPEG standards where the technology in the standard could be licensed from a single entity, MPEG LA, when the HEVC standard was finished, two patent pools had been formed with a third pool on the horizon. In addition, various patent holders were refusing to license patents via either pool, increasing uncertainty about HEVC's licensing. According to Microsoft's Ian LeGrow, an open-source, royalty-free technology was seen as the easiest way to eliminate this uncertainty around licensing.^[9]

The negative effect of patent licensing on free and open-source software has also been cited as a reason for the creation of AV1.^[7] For example, building an H.264 implementation into Firefox would prevent it from being distributed free of charge since licensing fees would have to be paid to MPEG-LA.^[12] Free Software Foundation Europe has argued that FRAND patent licensing practices make the free software implementation of standards impossible due to various incompatibilities with free-software licenses.^[8]

Many of the components of the AV1 project were sourced from previous research efforts by Alliance members. Individual contributors had started experimental technology platforms years before: Xiph's/Mozilla's Daala published code in 2010, Google's experimental VP9 evolution project VP10 was announced on 12 September 2014,^[13] and Cisco's Thor was published on 11 August 2015. Building on the code base of VP9, AV1 incorporates additional techniques, several of which were developed in these experimental formats.^[14]

Many companies are part of Alliance for Open Media, including Samsung, Vimeo, Microsoft, Netflix, Mozilla, AMD, Nvidia, Intel, ARM, Google, Facebook, Cisco, Amazon, Hulu, VideoLAN, Adobe, and Apple. Apple is an AOMedia governing member, although it joined after the formation. The management of the AV1 streams has been officially included among the typological videos manageable by Coremedia.^[15] The first version 0.1.0 of the AV1 reference codec was published on April 7, 2016. Although a soft feature freeze came into effect at the end of October 2017, development continued on several significant features. The bitstream format, was projected to be frozen in January 2018 but was delayed due to unresolved critical bugs as well as further changes to transformations, syntax, the prediction of motion vectors, and the completion of legal analysis.^{[citation needed]} The Alliance announced the release of the AV1 bitstream specification on March 28, 2018, along with a reference, software-based encoder and decoder.^[16] On 25 June 2018, a validated version 1.0.0 of the specification was released.^[17] On January 8, 2019, a validated version 1.0.0 with Errata 1 of the specification was released. Martin Smole from AOM member Bitmovin said that the computational efficiency was the greatest remaining challenge after the bitstream format freeze had been completed.^[18] While working on the format, the encoder was not targeted for production use and speed optimizations were not prioritized. Consequently, the early version of AV1 was orders of magnitude slower than existing HEVC encoders. Much of the development effort was consequently shifted towards maturing the reference encoder. In March 2019, it was reported that the speed of the reference encoder had improved greatly and within the same order of magnitude as encoders for other common formats.^[19] On January 21, 2021, the MIME type of AV1 was defined as video/AV1. The usage of AV1 using this MIME type is restricted to Real-time Transport Protocol purposes only.^[20]

Purpose

AV1 aims to be a video format for the web that is both state-of-the-art and royalty free.^[2] According to Matt Frost, head of strategy and partnerships in Google's Chrome Media team, "The mission of the Alliance for Open Media remains the same as the WebM project."^[21] A recurring concern in standards development, not least of royalty-free multimedia formats, is the danger of accidentally infringing on patents that their creators and users did not know about. This concern has been raised regarding AV1,^[22] and previously VP8,^[23] VP9,^[24] Theora^[25] and IVC.^[26] The problem is not unique to royalty-free formats, but it uniquely threatens their status as royalty-free.

Patent licensing	AV1, VP9, Theora, MPEG-5 Base profile	VVC, HEVC, AVC, MPEG-5 Main profile	GIF, MP3, MPEG-1, MPEG-2, MPEG-4 Part 2
By known patent holders	Royalty-free	Royalty bearing	Patents expired
By unknown patent holders	Impossible to ascertain until the format is old enough that any patents would have expired (at least 20 years in WTO countries)		Patents expired

To fulfill the goal of being royalty free, the development process requires that no feature can be adopted before it has been confirmed independently by two separate parties to not infringe on patents of competing companies. In cases where an alternative to a patent-protected technique is not available, owners of relevant patents have been invited to join the Alliance (even if they were already members of another patent pool). For example, Alliance members Apple, Cisco, Google, and Microsoft are also licensors in MPEG-LA's patent pool for H.264.^[22] As an additional protection for the royalty-free status of AV1, the Alliance has a legal defense fund to aid smaller Alliance members or AV1 licensees in the event they are sued for alleged patent infringement.^[22]^[6]^[27]

Under patent rules adopted from the World Wide Web Consortium (W3C), technology contributors license their AV1-connected patents to anyone, anywhere, anytime based on reciprocity (i.e. as long as the user does not engage in patent litigation).^[28] As a defensive condition, anyone engaging in patent litigation loses the right to the patents of all patent holders.^{[citation needed]}^[29]

This treatment of intellectual property rights (IPR), and its absolute priority during development, is contrary to extant MPEG formats like AVC and HEVC. These were developed under an IPR uninvolvement policy by their standardization organisations, as stipulated in the ITU-T's definition of an open standard. However, MPEG's chairman has argued this practice has to change,^[30] which it is:^{[citation needed]} EVC is also set to have a royalty-free subset,^[31]^[32] and will have switchable features in its bitstream to defend against future IPR threats.^{[citation needed]}

The creation of royalty-free web standards has been a long-stated pursuit for the industry. In 2007, the proposal for HTML video specified Theora as mandatory to implement. The reason was that public content should be encoded in freely implementable formats, if only as a "baseline format", and that changing such a baseline format later would be hard because of network effects.^[33]

The Alliance for Open Media is a continuation of Google's efforts with the WebM project, which renewed the royalty-free competition after Theora had been surpassed by AVC. For companies such as Mozilla that distribute free software, AVC can be difficult to support as a per-copy royalty is unsustainable given the lack of revenue stream to support these payments in free software (see FRAND § Excluding costless distribution).^[4] Similarly, HEVC has not successfully convinced all licensors to allow an exception for freely distributed software (see HEVC § Provision for costless software).

The performance goals include "a step up from VP9 and HEVC" in efficiency for a low increase in complexity. NETVC's efficiency goal is 25% improvement over HEVC.^[34] The primary complexity concern is for software decoding, since hardware support will take time to reach users. However, for WebRTC, live encoding performance is also relevant, which is Cisco's agenda: Cisco is a manufacturer of videoconferencing equipment, and their Thor contributions aim at "reasonable compression at only moderate complexity".^[35]

Feature-wise, AV1 is specifically designed for real-time applications (especially WebRTC) and higher resolutions (wider color gamuts, higher frame rates, UHD) than typical usage scenarios of the current generation (H.264) of video formats, where it is expected to achieve its biggest efficiency gains. It is therefore planned to support the color space from ITU-R Recommendation BT.2020 and up to 12 bits of precision per color component.^[36] AV1 is primarily intended for lossy encoding, although lossless compression is supported as well.^[37]

Technology

AV1 is a traditional block-based frequency transform format featuring new techniques. Based on Google's VP9,^[38] AV1 incorporates additional techniques that mainly give encoders more coding options to enable better adaptation to different types of input.

The Alliance published a reference implementation written in C and assembly language (aomenc, aomdec) as free software under the terms of the BSD 2-Clause License.^[40] Development happens in public and is open for contributions, regardless of AOM membership. The development process was such that coding tools were added to the reference code base as experiments, controlled by flags that enable or disable them at build time, for review by other group members as well as specialized teams that helped with and ensured hardware friendliness and compliance with intellectual property rights (TAPAS). When the feature gained some support in the community, the experiment was enabled by default, and ultimately had its flag removed when all of the reviews were passed.^[41] Experiment names were lowercased in the configure script and uppercased in conditional compilation flags.^{[citation needed]} To better and more reliably support HDR and color spaces, corresponding metadata can now be integrated into the video bitstream instead of being signaled in the container.

Partitioning

Frame content is separated into adjacent same-sized blocks referred to as superblocks. Similar to the concept of a macroblock, superblocks are square-shaped and can either be of size 128×128 or 64×64 pixels. Superblocks can be divided in smaller blocks according to different partitioning patterns. The four-way split pattern is the only pattern whose partitions can be recursively subdivided. This allows superblocks to be divided into partitions as small as 4×4 pixels.

"T-shaped" partitioning patterns are introduced, a feature developed for VP10, as well as horizontal or vertical splits into four stripes of 4:1 and 1:4 aspect ratio. The available partitioning patterns vary according to the block size, both 128×128 and 8×8 blocks can't use 4:1 and 1:4 splits. Moreover, 8×8 blocks can't use T-shaped splits.

Two separate predictions can now be used on spatially different parts of a block using a smooth, oblique transition line (wedge-partitioned prediction).^{[citation needed]} This enables more accurate separation of objects without the traditional staircase lines along the boundaries of square blocks.

More encoder parallelism is possible thanks to configurable prediction dependency between tile rows (ext_tile).^[42]

Prediction

AV1 performs internal processing in higher precision (10 or 12 bits per sample), which leads to quality improvement by reducing rounding errors.

Predictions can be combined in more advanced ways (than a uniform average) in a block (compound prediction), including smooth and sharp transition gradients in different directions (wedge-partitioned prediction) as well as implicit masks that are based on the difference between the two predictors. This allows the combination of either two inter predictions or an inter and an intra prediction to be used in the same block.^[43]^{[citation needed]}

A frame can reference 6 instead of 3 of the 8 available frame buffers for temporal (inter) prediction while providing more flexibility on bi-prediction^[44] (ext_refs^{[citation needed]}).

The Warped Motion (warped_motion)^[42] and Global Motion (global_motion^{[citation needed]}) tools in AV1 aim to reduce redundant information in motion vectors by recognizing patterns arising from camera motion.^[42] They implement ideas that were attempted in preceding formats like e.g. MPEG-4 ASP, albeit with a novel approach that works in three dimensions. There can be a set of warping parameters for a whole frame offered in the bitstream, or blocks can use a set of implicit local parameters that get computed based on surrounding blocks.

Switch frames (S-frame) are a new inter-frame type that can be predicted using already-decoded reference frames from a higher-resolution version of the same video to allow switching to a lower resolution without the need for a full keyframe at the beginning of a video segment in the adaptive bitrate streaming use case.^[45]

Intra prediction

Intra prediction consists of predicting the pixels of given blocks only using information available in the current frame. Most often, intra predictions are built from the neighboring pixels above and to the left of the predicted block. The DC predictor builds a prediction by averaging the pixels above and to the left of block.

Directional predictors extrapolate these neighboring pixels according to a specified angle. In AV1, 8 main directional modes can be chosen. These modes start at an angle of 45 degrees and increase by a step size of 22.5 degrees up until 203 degrees. Furthermore, for each directional mode, six offsets of 3 degrees can be signaled for bigger blocks, three above the main angle and three below it, resulting in a total of 56 angles (ext_intra).

The "TrueMotion" predictor was replaced with a Paeth predictor which looks at the difference from the known pixel in the above-left corner to the pixel directly above and directly left of the new one and then chooses the one that lies in direction of the smaller gradient as predictor. A palette predictor is available for blocks with up to 8 dominant colors, such as some computer screen content. Correlations between the luminosity and the color information can now be exploited with a predictor for chroma blocks that is based on samples from the luma plane (cfl).^[42] In order to reduce visible boundaries along borders of inter-predicted blocks, a technique called overlapped block motion compensation (OBMC) can be used. This involves extending a block's size so that it overlaps with neighboring blocks by 2 to 32 pixels, and blending the overlapping parts together.^[46]

Data transformation

To transform the error remaining after prediction to the frequency domain, AV1 encoders can use square, 2:1/1:2, and 4:1/1:4 rectangular DCTs (rect_tx),^[44] as well as an asymmetric DST^[47]^[48]^[49] for blocks where the top and/or left edge is expected to have lower error thanks to prediction from nearby pixels, or choose to do no transform (identity transform).

It can combine two one-dimensional transforms in order to use different transforms for the horizontal and the vertical dimension (ext_tx).^[42]^[44]

Quantization

AV1 has new optimized quantization matrices (aom_qm).^[50] The eight sets of quantization parameters that can be selected and signaled for each frame now have individual parameters for the two chroma planes and can use spatial prediction. On every new superblock, the quantization parameters can be adjusted by signaling an offset.

Filters

In-loop filtering combines Thor's constrained low-pass filter and Daala's directional deringing filter into the Constrained Directional Enhancement Filter, cdef. This is an edge-directed conditional replacement filter that smooths blocks roughly along the direction of the dominant edge to eliminate ringing artifacts.^[51]

There is also the loop restoration filter (loop_restoration) based on the Wiener filter and self-guided restoration filters to remove blur artifacts due to block processing.^[42]

Film grain synthesis (film_grain) improves coding of noisy signals using a parametric video coding approach. Due to the randomness, inherent to film grain noise, this signal component is traditionally either very expensive to code or prone to get damaged or lost, possibly leaving serious coding artifacts as residue. This tool circumvents these problems using analysis and synthesis, replacing parts of the signal with a visually similar synthetic texture based solely on subjective visual impression instead of objective similarity. It removes the grain component from the signal, analyzes its non-random characteristics, and instead transmits only descriptive parameters to the decoder, which adds back a synthetic, pseudorandom noise signal that's shaped after the original component. It is the visual equivalent of the Perceptual Noise Substitution technique used in AC3, AAC, Vorbis, and Opus audio codecs.

Entropy coding

Daala's entropy coder (daala_ec^{[citation needed]}), a non-binary arithmetic coder, was selected for replacing VP9's binary entropy coder. The use of non-binary arithmetic coding helps evade patents but also adds bit-level parallelism to an otherwise serial process, reducing clock rate demands on hardware implementations.^{[citation needed]} This is to say that the effectiveness of modern binary arithmetic coding like CABAC is being approached using a greater alphabet than binary, hence greater speed, as in Huffman code (but not as simple and fast as Huffman code). AV1 also gained the ability to adapt the symbol probabilities in the arithmetic coder per coded symbol instead of per frame (ec_adapt).^[42]

AV1 has provisions for temporal and spatial scalability.^[52]

Quality and efficiency

A first comparison from the beginning of June 2016^[53] found AV1 roughly on par with HEVC, as did one using code from late January 2017.^[54]

In April 2017, using the 8 enabled experimental features at the time (of 77 total), Bitmovin was able to demonstrate favorable objective metrics, as well as visual results, compared to HEVC on the Sintel and Tears of Steel short films.^[55] A follow-up comparison by Jan Ozer of Streaming Media Magazine confirmed this, and concluded that "AV1 is at least as good as HEVC now".^[56] Ozer noted that his and Bitmovin's results contradicted a comparison by Fraunhofer Institute for Telecommunications from late 2016^[57] that had found AV1 65.7% less efficient than HEVC, underperforming even H.264/AVC which they concluded as being 10.5% more efficient. Ozer justified this discrepancy by having used encoding parameters endorsed by each encoder vendor, as well as having more features in the newer AV1 encoder.^[57] Decoding performance was at about half the speed of VP9 according to internal measurements from 2017.^[45]

Tests from Netflix in 2017, based on measurements with PSNR and VMAF at 720p, showed that AV1 was about 25% more efficient than VP9 (libvpx).^[58] Tests from Facebook conducted in 2018, based on PSNR, showed that the AV1 reference encoder was able to achieve 34%, 46.2% and 50.3% higher data compression than libvpx-vp9, x264 High profile, and x264 Main profile respectively.^[59]^[3]

Tests from Moscow State University in 2017 found that VP9 required 31% and HEVC 22% more bitrate than AV1 in order to achieve similar levels of quality.^[60] The AV1 encoder was operating at speed "2500–3500 times lower than competitors" due to the lack of optimization (which was not available at that time).^[61] Tests from University of Waterloo in 2020 found that when using a mean opinion score (MOS) for 2160p (4K) video AV1 had the bitrate saving of 9.5% compared to HEVC and 16.4% compared to VP9. They also concluded that at the time of the study at 2160p the AV1 video encodes on average took 590× longer compared to encoding with AVC; while HEVC took on average 4.2× longer and VP9 took on average 5.2× longer than AVC respectively.^[62]^[63]

The latest encoder comparison by Streaming Media Magazine as of September 2020, which used moderate encoding speeds, VMAF, and a diverse set of short clips, indicated that the open-source libaom and SVT-AV1 encoders took about twice as long time to encode as x265 in its "veryslow" preset while using 15-20% less bitrate, or about 45% less bitrate than x264 veryslow. The best-in-test AV1 encoder, Visionular's Aurora1, in its "slower" preset, was as fast as x265 veryslow while saving 50% bitrate over x264 veryslow.^[64]

CapFrameX tested the GPUs performance with AV1 decoding.^[65] On 5 October 2022, Cloudflare announced that it has a beta player.^[66]

Profiles and levels

Profiles

AV1 defines three profiles for decoders which are Main, High, and Professional. The Main profile allows for a bit depth of 8 or 10 bits per sample with 4:0:0 (greyscale) and 4:2:0 (quarter) chroma sampling. The High profile further adds support for 4:4:4 chroma sampling (no subsampling). The Professional profile extends capabilities to full support for 4:0:0, 4:2:0, 4:2:2 (half) and 4:4:4 chroma sub-sampling with 8, 10 and 12 bit color depths.^[16]

Feature comparison between AV1 profiles
		Main (0)	High (1)	Professional (2)
Bit depth		8 or 10	8 or 10	8, 10 & 12
Chroma subsampling	4:0:0	Yes	Yes	Yes
	4:2:0	Yes	Yes	Yes
	4:2:2	No	No	Yes
	4:4:4	No	Yes	Yes

Levels

AV1 defines levels for decoders with maximum variables for levels ranging from 2.0 to 6.3.^[67] The levels that can be implemented depend on the hardware capability.

Example resolutions would be 426×240@30 fps for level 2.0, 854×480@30 fps for level 3.0, 1920×1080@30 fps for level 4.0, 3840×2160@60 fps for level 5.1, 3840×2160@120 fps for level 5.2, and 7680×4320@120 fps for level 6.2. Level 7 has not been defined yet.^[68]

seq_level_idx	Level	MaxPicSize (Samples)	MaxHSize (Samples)	MaxVSize (Samples)	MaxDisplayRate (Hz)	MaxDecodeRate (Hz)	MaxHeader Rate (Hz)	MainMbps (Mbit/s)	HighMbps (Mbit/s)	Min Comp Basis	Max Tiles	Max Tile Cols	Example
0	2.0	147456	2048	1152	4,423,680	5,529,600	150	1.5	-	2	8	4	426×240@30fps
1	2.1	278784	2816	1584	8,363,520	10,454,400	150	3.0	-	2	8	4	640×360@30fps
4	3.0	665856	4352	2448	19,975,680	24,969,600	150	6.0	-	2	16	6	854×480@30fps
5	3.1	1065024	5504	3096	31,950,720	39,938,400	150	10.0	-	2	16	6	1280×720@30fps
8	4.0	2359296	6144	3456	70,778,880	77,856,768	300	12.0	30.0	4	32	8	1920×1080@30fps
9	4.1	2359296	6144	3456	141,557,760	155,713,536	300	20.0	50.0	4	32	8	1920×1080@60fps
12	5.0	8912896	8192	4352	267,386,880	273,715,200	300	30.0	100.0	6	64	8	3840×2160@30fps
13	5.1	8912896	8192	4352	534,773,760	547,430,400	300	40.0	160.0	8	64	8	3840×2160@60fps
14	5.2	8912896	8192	4352	1,069,547,520	1,094,860,800	300	60.0	240.0	8	64	8	3840×2160@120fps
15	5.3	8912896	8192	4352	1,069,547,520	1,176,502,272	300	60.0	240.0	8	64	8	3840×2160@120fps
16	6.0	35651584	16384	8704	1,069,547,520	1,176,502,272	300	60.0	240.0	8	128	16	7680×4320@30fps
17	6.1	35651584	16384	8704	2,139,095,040	2,189,721,600	300	100.0	480.0	8	128	16	7680×4320@60fps
18	6.2	35651584	16384	8704	4,278,190,080	4,379,443,200	300	160.0	800.0	8	128	16	7680×4320@120fps
19	6.3	35651584	16384	8704	4,278,190,080	4,706,009,088	300	160.0	800.0	8	128	16	7680×4320@120fps

Supported container formats

Standardized:

ISO base media file format:^[69] the ISOBMFF containerization spec by AOMedia was the first to be finalized and the first to gain adoption. This is the format used by YouTube.
Matroska: version 1 of the Matroska containerization spec^[70] was published in late 2018.^[71]

Unfinished standards:

MPEG Transport Stream (MPEG TS)^[72]
Real-time Transport Protocol: a preliminary RTP packetization spec by AOMedia defines the transmission of AV1 OBUs (Open Bitstream Units^[73]) directly as the RTP payload.^[52] It defines an RTP header extension that carries information about video frames and their dependencies, which is of general usefulness to § scalable video coding. The carriage of raw video data also differs from for example MPEG TS over RTP in that other streams, such as audio, must be carried externally.

Not standardized:

WebM: as a matter of formality, AV1 has not been sanctioned into the subset of Matroska known as WebM as of late 2019.^[74] However support has been present in libwebm since May 2018.^[75]
On2 IVF: this format was inherited from the first public release of VP8, where it served as a simple development container.^[76] rav1e also supports this format.^[77]
Pre-standard WebM: Libaom featured early support for WebM before Matroska containerization was specified; this has since been changed to conform to the Matroska spec.^[78]

Adoption

Content providers

AV1 video is usually accompanied with AAC or Opus audio in an ISO base media file format (MP4) container.

In October 2016, Netflix stated they expected to be an early adopter of AV1.^[79] On 5 February 2020, Netflix began using AV1 to stream select titles on Android, providing 20% improved compression efficiency over their VP9 streams.^[80] On 9 November 2021, Netflix announced it had begun streaming AV1 content to a number of TVs with AV1 decoders as well as the PlayStation 4 Pro.^[81]

In 2018, YouTube began deploying AV1, starting with its AV1 Beta Launch Playlist. According to the description, the videos are (to begin with) encoded at high bitrate to test decoding performance, and YouTube has "ambitious goals" for rolling out AV1. YouTube for Android TV supports playback of videos encoded in AV1 on capable platforms as of version 2.10.13, released in early 2020.^[82] In 2020, YouTube started serving videos at 8K resolution in AV1.^[83]

In February 2019, Facebook followed its own positive test results, by saying it would gradually roll out the AV1 codec as soon as browser support emerges, starting with its most popular videos.^[59] Also in 2022, its parent company Meta expressed interest in SVT-AV1 as in the meantime Google engineer Matt Frost spoke at the ending on YouTube's Intel channel that an intention was to carry out a first test in 2023,^[84] when hardware acceleration will be introduced and widespread, but on the latest May video by Streaming Media the status was unknown and no statements from the AOMedia were expressed.^[85] MSVP (Meta Scalable Video Processor) was announced^[86] and the symposis was published in a popular scientific research website on 15 October 2022.

On 4 November 2022, the AV1 codec was announced with the article of Meta technology blog and with Mark Zuckerberg on Instagram Reels which shows AV1 codec compared with H.264/MPEG-4 AVC. Citing "Our Instagram engineering team developed a way to dramatically improve video quality. We made basic video processing 94% faster."^[87]^[88] Android has preliminary native AV1 playback.^[89]^[90]

In June 2019, Vimeo's videos in the "Staff picks" channel were available in AV1 and Opus.^[91] Vimeo is using and contributing to Mozilla's Rav1e encoder and expects, with further encoder improvements, to eventually provide AV1 support for all videos uploaded to Vimeo as well as the company's "Live" offering.^[91]

On 30 April 2020, iQIYI announced support for AV1 for users on PC web browsers and Android devices, according to the announcement, as the first Chinese video streaming site to adopt the codec.^[92]

Twitch deployed AV1 for its most popular content in 2022 or 2023,^[93] with universal support projected to arrive in 2024 or 2025.^[94]^[95]

In April 2021, Roku removed the YouTube TV app from the Roku streaming platform after a contract expired. It was later reported that Roku streaming devices do not use processors that support the AV1 codec. In December 2021, YouTube and Roku agreed to a multiyear deal to keep both the YouTube TV app and the YouTube app on the Roku streaming platform. Roku had argued that using processors in their streaming devices that support the royalty-free AV1 codec would increase costs to consumers.^[96]^[97]

In January 2022, Bilibili rolled out H.265 HEVC and AV1 encoding to videos with high view-count, while videos with lower view-count are only available in H.264 AVC.^[98]

In July 2024, DMM.com deployed AV1 on its DMM.TV service, becoming the first Japanese company to do so.^[99]

Software implementations

Libaom is the reference implementation. It includes an encoder (aomenc) and a decoder (aomdec). As the former research codec, it has the advantage of being made to justifiably demonstrate efficient use of every feature, but at the general cost of encoding speed. At feature freeze, the encoder had become problematically slow, but dramatic speed optimizations with negligible efficiency impact have subsequently been made.^[100]^[19]
SVT-AV1 includes an open-source encoder and decoder developed primarily by Intel in collaboration with Netflix^[101]^[102] with a special focus on threading performance. They implemented in Cidana Corporation (Cidana Developers) and Software Implementation Working Group (SIWG).^{^{[clarification needed]}} In August 2020, the Alliance for Open Media Software Implementation Working Group adopted SVT-AV1 as their production encoder.^[103] SVT-AV1 1.0.0 was released on 22 April 2022. SVT-AV1 2.0.0 was released on 13 March 2024.
rav1e is an encoder written in Rust and assembly language from the Xiph.Org Foundation.^[77] rav1e takes the opposite developmental approach to aomenc: start out as the simplest (therefore fastest) conforming encoder, and then improve efficiency over time while remaining fast.^[100]
dav1d is a decoder written in assembly and C99 focused on speed and portability, associated with VideoLAN.^[104] The first official version (0.1) was released in December 2018.^[105] Version 0.3 was announced in May 2019 with further optimizations demonstrating performance 2 to 5 times faster than aomdec.^[106] Version 0.5 was released in October 2019.^[107] Firefox 67 switched from Libaom to dav1d as a default decoder in May 2019.^[108] In 2019, dav1d v0.5 was rated the best decoder in comparison to libgav1 and libaom.^[109]
Cisco AV1 is a proprietary live encoder that Cisco developed for its Webex teleconference products. The encoder is optimized for latency^[110] and the constraint of having a usable CPU footprint as with a "commodity laptop".^[111] Cisco stressed that at their operating point – high speed, low latency – the large toolset of AV1 does not preclude a low encoding complexity.^[110] Rather, the availability of tools for screen content and scalability in all profiles enabled them to find good compression-to-speed tradeoffs, better even than with HEVC;^[111] Compared to their previously deployed H.264 encoder, a particular area of improvement was in high resolution screen sharing.^[110]
libgav1 is a decoder written in C++11 released by Google.^[112]

Other vendors had announced encoders, including EVE for AV1,^[113] NGCodec,^[114] Socionext,^[115] Aurora^[116] and MilliCast.^[117]

Software support

Web browsers:

Firefox (software decoder since version 67.0, released in May 2019: enabled by default on all desktop platforms - Windows, macOS and Linux for both 32-bit and 64-bit systems).^[118] Hardware decoder on compatible platforms since version 100.0, released on 3 May 2022.^[119]^[120]
Google Chrome: decoder since version 70, October 2018^[121] - encoder since 90, 14 April 2021.^[122]
Opera (since version 57, 28 November 2018)^[123]^[124]
Microsoft Edge (since Windows 10 October 2018 Update (1809) with AV1 Video Extension add-on,^[125] and natively since version 121 released in January 2024.)^[126]
Vivaldi (since October 2018)^[127]
Brave
SeaMonkey 2.53.5 (since November 2020)^[128]
Safari 17.0 (since September 2023) on iPhone 15 Pro, iPhone 15 Pro Max, iPhone 16 and Mac computers with Apple M3 SoCs^[129]^[130]^[131]

Video players:

VLC media player (since version 3.0)^[132]
mpv (since version 0.29.0)^[133]
Xine-lib (since 1.2.10)
IINA (since version 1.1.0 beta 1; 2 September 2020; decoding support)^[134]
PotPlayer (since version 1.7.14804, 16 October 2018).^[135]
K-Lite Codec Pack (since version 14.4.5, 13 September 2018)^[136]
Media Player Classic (since version 1.8.1, 14 September 2018)^[137]
MX Player (since version 1.24.1, 7 May 2020)

Encoder front-ends:

FFmpeg (libaom support since version 4.0, rav1e support since version 4.3, SVT-AV1 support since version 4.4)
HandBrake (since version 1.3.0, 9 November 2019 decoding support;^[138] since version 1.6.0, 29 December 2022, SVT-AV1 and QSV AV1 encoding support)^[139]
Bitmovin Encoding (since version 1.50.0, 4 July 2018)^[140]

Video editors:

DaVinci Resolve (since version 17.2, May 2021, decoding support; since version 17.4.6, March 2022, Intel Arc hardware encoding support, since version 18.1, November 2022, Nvidia hardware encoding support, AMD hardware encoding support added with version 18.5 in July 2023^[141])

Others:

GStreamer (since version 1.14)^[142]
OBS Studio (libaom and SVT-AV1 support since 27.2 Beta 1)^[143] and since OBS Studio 29.1 Beta 1 encoding with GPUs that support it (QSV, NVENC, VCN 4.0) as well as AV1 streaming transmission on YouTube and also other platforms via RTMP (Real Time Messaging Protocol), YouTube joins SRT Alliance.
MKVToolNix (adoption of final av1-in-mkv spec since version 28)
MediaInfo (since version 18.03)^[144]
Google Duo (since April 2020)^[145]
Adobe Audition (decoding support, preview video)
Avidemux (since version 2.76, 7 July 2020; decoding support)
VDPAU (since version 1.5, 7 March 2022; decoding support)

Operating system support

AV1 support by different operating systems
	Microsoft Windows	macOS	BSD / Linux	ChromeOS	Android	iOS
Codec support	Yes	Partial	Yes	Yes	Yes	Partial
Container support	ISO base media file format (.mp4) WebM (.webm) Matroska (.mkv)	ISO base media file format (.mp4) WebM (.webm)	ISO base media file format (.mp4) WebM (.webm) Matroska (.mkv)		ISO base media file format (.mp4) WebM (.webm) Matroska (.mkv)	ISO base media file format (.mp4) WebM (.webm)
Notes	Support introduced in Windows 10 October 2018 Update (1809) with AV1 Video Extension add-on for free download^[125] Support for hardware acceleration added in Windows 10 November 2019 Update (1909)^[146] Supported in Universal Windows Platform apps like Films & TV	Built-in playback support only on devices with M3 Apple silicon and higher, which have AV1 hardware decoders.^[147]^[130]^[131] Firefox 67 and higher and Chrome 70 and higher support playback on all devices.^[148]^[149]		Supports decoding, from ChromeOS 70 onward	Supported since Android 10^[150]^[151]^[152]	Playback support only on devices with A17 Apple Silicon and higher, which have AV1 hardware decoders.^[147]^[129]

Hardware

Comparison of AV1 hardware
Company	Product	Profile	Throughput (single core)^{[clarification needed]}	Throughput (max)^{[clarification needed]}	Ref
AMD	RDNA 2 (excluding Navi 24)	Main (0)		8K30 10-bit	^[153]^[154]^[155]^[156]
	RDNA 3			8K60 (10-bit encode, 12-bit decode)	^[157]^[158]
	RDNA 3.5			4K60
	Alveo MA35D				^[159]^[160]
Amlogic	S905X4		4K120	8K	^[161]
	S908X		8K60
	S805X2		1080p
Apple	A17 Pro		4K60		^[162]
	A18 / A18 Pro
	M3 series
	M4 series
Broadcom	BCM7218X			4K	^[163]
Chips&Media	WAVE510A WAVE627^[164]	Main (0)	4K60	4K120	^[165]
Google	Tensor Original / G2		4K60		^[166]
Google	Tensor G3		4K60		^[167]
Intel	Xe	Main (0)	8K 10-bit^[168]		^[169]^[170]^[154]^[171]
	Xe 2		8K 10-bit	8K 10-bit
	Arc			8K60	^[172]^[173]
	Data Center GPU Flex Series				^[174]^[175]
MediaTek	Dimensity 1000 series		4K60	4K60	^[176]^[177]^[178]^[179]
	Dimensity 8000 series				^[180]
	Dimensity 9000 series		8K30		^[181]^[182]
	MT96XX series		4K60 10-bit	4K60 10-bit	^[183]
	MT9950		8K30		^[184]
	Pentonic series
NETINT	Quadra T1 (1x Codensity G5 ASIC)		4x 4K60 10-bit streams	4x 4K60 10-bit streams	^[185]^[186]
	Quadra T2 (2x Codensity G5 ASICs)		4x 4K60 10-bit streams	8x 4K60 10-bit streams	^[185]^[186]
	Quadra T4 (4x Codensity G5 ASICs)		4x 4K60 10-bit streams	16x 4K60 10-bit streams	^[185]^[186]
Nvidia	GeForce 30	Main (0)	8K60 10-bit		^[187]^[154]^[188]
Nvidia	GeForce 40	Main (0)	8K60 10-bit	2x 8K60 10-bit	^[189]^[190]^[191]^[192]
Qualcomm	Snapdragon 8 Gen 2			8K60	^[193]
	Snapdragon 8/8s Gen 3
	Snapdragon X Plus/Elite	Main (0)	4K120 10-bit		^[194]
Realtek	RTD1311			4K	^[195]
Realtek	RTD2893			8K	^[196]^[197]
Rockchip	RK3588		4K60 10-bit		^[198]
Samsung	Exynos 2000 series		8K30		^[199]^[200]

Patent claims

In early 2019, Sisvel, a Luxembourg-based company, claimed to be forming a patent pool of patents essential to AV1.^[201] This development has not caused Google to reevaluate its planned AV1 usage^[202] and the Alliance for Open Media has stated they remain confident that AV1 still overcomes the environment of "high patent royalty requirements and licensing uncertainty".^[203] Sisvel began selling licenses to the pool, which contains patents from Philips, GE, NTT, Ericsson, Dolby, and Toshiba in 2020.^[204] Unified Patents has been tracking challenges to various patents in the pool.^[205]

On 7 July 2022, it was revealed that the European Union's antitrust regulators had opened an investigation into AOM and its licensing policy. It said this action may be restricting the innovators' ability to compete with the AV1 technical specification, and also eliminate incentives for them to innovate.^[206]

The Commission has information that AOM and its members may be imposing licensing terms (mandatory royalty-free cross licensing) on innovators that were not a part of AOM at the time of the creation of the AV1 technical, but whose patents are deemed essential to (its) technical specifications

On 23 May 2023, the European Commission decided to close the investigation while taking no further action. But in an email they reiterated that the closure does not constitute a finding of compliance or non-compliance with EU antitrust laws.^[207]

In October 2023, patent pool operator Avanci announced the start of a new licensing program targeting video streaming operators that use AV1 in addition to H.265, H.266, VP9, etc.^[208]

AV1 Image File Format (AVIF)

AV1 Image File Format (AVIF) is an image file format specification for storing still images or image sequences compressed with AV1 in the HEIF file format.^[209] It competes with HEIC which uses the same container format, built upon ISOBMFF, but HEVC for compression.

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External links

Official website

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[eetimes-av1release-6] Yoshida, Junko (28 March 2018). "Streaming Group to Pit AV1 Against H.265". EE Times. AspenCore, Inc. Archived from the original on 4 April 2019. Retrieved 4 April 2019.

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[comes_of_age-24] Ozer, Jan (June 2016). "VP9 Finally Comes of Age, But Is it Right for Everyone?". Archived from the original on 22 April 2018. Retrieved 21 April 2018.

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[ivc-26] Chiariglione, Leonardo (28 January 2018). "A crisis, the causes and a solution". Archived from the original on 17 April 2018. Retrieved 21 April 2018. two tracks in MPEG: one track producing royalty free standards (Option 1, in ISO language) and the other the traditional Fair Reasonable and Non Discriminatory (FRAND) standards (Option 2, in ISO language). (…) The Internet Video Coding (IVC) standard was a successful implementation of the idea (…). Unfortunately 3 companies made blank Option 2 statements (of the kind "I may have patents and I am willing to license them at FRAND terms"), a possibility that ISO allows. MPEG had no means to remove the claimed infringing technologies, if any, and IVC is practically dead.

[multichannel-nab2018-27] Baumgartner, Jeff (11 April 2018). "NAB 2018: Hardware Support a Big Step Ahead for AV1". Multichannel. Publishing Limited Quay House. Archived from the original on 4 April 2019. Retrieved 4 April 2019.

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[crisis-30] Chiariglione, Leonardo (28 January 2018). "A crisis, the causes and a solution". Archived from the original on 17 April 2018. Retrieved 21 April 2018. How could MPEG achieve this? Thanks to its "business model" that can simply be described as: produce standards having the best performance as a goal, irrespective of the IPR involved.

[meeting125-31] Timmerer, Christian (14 February 2019). "MPEG 125 Meeting Report". Bitmovin. Archived from the original on 6 April 2019. Retrieved 6 April 2019.

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[video_element-33] Wium Lie, Håkon (29 March 2007). "Proposal for the HTML 5 video element (Google TechTalks)". Google Video, later YouTube. Archived from the original on 25 February 2019. Retrieved 3 January 2019. Flash is today the baseline format on the web. The problem with Flash is that it's not an open standard. It's a proprietary format, it hasn't been documented, and it probably requires the payment of licenses if you are going to (…) write software for it (…) The web community has always been based on open standards. This has been what the web was founded on, where HTML started. That's why we developed the PNG image format – we wanted a freely implementable open standard to hold the content we are putting out there. Our content is too valuable to put into some locked format. This goes back all the way to SGML, in which the mantra was "own your data". (…) If we look at open standards for video today (…), there is one which I believe is the right one, and that's called Ogg Theora.

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[integrating-thor-35] Midtskogen, Steinar; Fuldseth, Arild; Bjøntegaard, Gisle; Davies, Thomas (13 September 2017). "Integrating Thor tools into the emerging AV1 codec" (PDF). Archived (PDF) from the original on 25 February 2019. Retrieved 2 October 2017. What can Thor add to VP9/AV1? Since Thor aims for reasonable compression at only moderate complexity, we considered features of Thor that could increase the compression efficiency of VP9 and/or reduce the computational complexity.

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[github-37] "libaom v1.3.0 changelog". AOM Github Repository. Archived from the original on 22 September 2021. Retrieved 22 April 2020.

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[VP10-43] Mukherjee, Debargha; Su, Hui; Bankoski, Jim; Converse, Alex; Han, Jingning; Liu, Zoe; Xu, Yaowu (2015), Tescher, Andrew G (ed.), "An overview of new video coding tools under consideration for VP10 – the successor to VP9", SPIE Optical Engineering+ Applications, Applications of Digital Image Processing XXXVIII, 9599, International Society for Optics and Photonics: 95991E, Bibcode:2015SPIE.9599E..1EM, doi:10.1117/12.2191104, S2CID 61317162

[ibc2018-talk-codec-wars-44] Ian Trow (16 September 2018). Tech Talks: Codec wars (Recorded talk). IBC 2018 Conference. 28 minutes in. Retrieved 18 September 2018.

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[feldman-obmc-46] Feldman, Christian (7 May 2019). VES104. AV1/VVC Update. Streaming Media Magazine (Talk) (published 6 January 2020). Event occurs at 9 minutes 33 seconds. Retrieved 8 January 2020.

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