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VP9 is an open and royalty-free video coding compression format. According to VP9 Wikipedia, “VP9 is the last official iteration of the TrueMotion series of video formats that Google bought in 2010...with the company On2 Technologies that created it.” VP9 is the successor to VP8 video compression format, for the WebM Project open video codec in 2013. VP9 Video Codec is documented in the Draft VP9 Bitstream and Decoding Process Specification, last modified March 2017, as well as the related document from the Internet Engineering Task Force (IEFT), RTP Payload Format for VP9 Video. WebMProject.org’s FAQs page describes VP9 as a highly efficient audio compression technology, VP9 delivers “high-quality video while efficiently adapting to varying processing and bandwidth conditions across a broad range of devices...VP9 makes it easy to integrate into existing environments and requires comparatively little manual tuning in the encoder to produce high-quality results.”
Next-Generation VP9 Bit-stream:
According to A Technical Overview of VP9—the Latest Open-Source Video Codec, 2015, “In late 2011, Google started working towards a next-generation video codec, aka VP9, with the explicit goal of creating a format that produces a much more compact bit-stream than predecessor VP8 (fdd000578), especially for high-definition content, with only a modest increase in decoding complexity.” The article also describes the VP9’s Coding Tools and Bit-Stream Features, referenced below.
VP9 Bit-Stream Features:
Note: Features are “designed to support specific use-cases that are important to Internet video delivery and consumption...Exploiting these features appropriately needs specialized encoders and/or decoders to be created.”
According to Naveed Altaf A in VP9 Codec – What is VP9?, May 2022, like VP8 but improved, VP9 uses block-based motion estimation for higher compression performance, has improved rate control, and supports High Dynamic Range (HDR) and 10-bit color depth. “The VP9 codec is similar to the H.265 (HEVC_family) process in terms of its working and supports parallel processing. It reduces the bitrate to half of the original without compromising on the quality...The VP9 codec works by compressing the initial raw video file using an algorithm into half the original size which makes it fit for seamless transmission over the internet.” Wikidata has a helpful comparison of compression efficiency between HEVC/H.265 and VP9 based on subjective assessments.
The WebM Project’s VP9 Coding Profiles page lists the VP9 4 variants, or coding profiles, that define the tools used during encoding. Profile 0 is the basic variant (default), the least demanding from hardware implementation.
The WebM Project’s VP9 Levels and Decoder Testing page defines 14 levels, limiting various encoding configuration options, for VP9 Profile 0 (8-bit) and Profile 2 (10-bit). Layers are coded with resolutions, frame rates, and bitstreams.
Levels listed: Max Luma Sample Rate, Max Luma Picture Size, Max Bitrate, Max CPB Size, Min Compression Ratio, Max Number of Tiles, Min Alt-Ref Distance, Max Reference Frames, Max Width and Height for Luma Picture, and Example Frame Size and Display Rate.
Google Groups Conversations user, James Zern, describes profiles and levels, stating “Profiles and levels are just a description of the properties of the particular bitstream, they don’t affect the decode process, they’re used to constrain the bitstream at encode time. In VP9’s case this information is transmitted out of band, e.g., via the container or dash manifest.”
Uses of VP9:
According to James Konik in The VP9 Codec: How Does It Stack Up?, June 2021, in the BitMovin.com blog post, “VP9 outperforms HEVC at resolutions above HD. That makes it a great choice if you’re working with video at different sizes, or if you’re focusing specifically on HD...Thanks to widespread hardware support, it gives smoother playback on PCs in most scenarios...Safari has added support for the codec, making it the clear choice for high-resolution video in the macOS version of browser.”
In the TuBeast.com’s article, Stream Faster and More Efficiently with VP9 – YouTube's Codec, January 2023, Tommy L. writes, VP9 is “primarily used for streaming video content on YouTube, and is designed to improve video streaming performance, quality, and reduce bandwidth usage. VP9 is also referred to as “YouTube’s Codec” because of its exclusive use on the platform.”
|Production phase||Generally, a final-state (end-user video delivery) format.|
|Relationship to other formats|
WebMProject.org, “WebM files consist of video streams compressed with the VP8 or VP9 video codec.”
WebM Wikipedia page, WebM - Container for VP8/VP9/AV1 (video), Vorbis/Opus (audio).
HyperText Markup Language (HTML) 5.
As stated in the Google Case Study: YouTube and HTML5, "HTML5 video supports next-generation video compression, with over two billion devices supporting the VP9 video codec."
|Has earlier version||VP8, VP8 Video Codec. VP9 Wikipedia, "VP9 is the successor to VP8."|
|Has later version||AV1, AV1. AV1 Wikipedia, AV1 "was developed as a successor to VP9 by the Alliance for Open Media (AOMedia)." Not described separately on this website at this time.|
|LC experience or existing holdings||The Library of Congress has VP9 in containers, including WebM, in its collections.|
|LC preference||See the Library of Congress Recommended Formats Statement for format preferences for moving image works.|
Open source, royalty free format.
The WebM Project states, “VP9, the WebM Project's next-generation open video codec, became available on June 17, 2013.”
WebMProject.org VP9 Video Code - summarizes VP9 topics relating to WebM Project.
Draft VP9 Bitstream and Decoding Process Specification Version 0.6, Last Modified 03- 27-2017. Note: Specification is not final.
Related Documents: RTP Payload Format for VP9 Video
Jan Ozer of Wowza.com, in VP9 Codec: Google’s Open-Source Technology Explained, 2021, wrote, “In terms of usage, by far the largest distributor of VP9-encoded content was YouTube, though YouTube still encodes the vast bulk of its files with H.264. In 2016, Netflix announced that it was using VP9 for video downloads, while JW Player distributes on-demand video in its online video platform using H.264 and VP9.”
Wikipedia endorses multimedia formats that are open and royalty free, as such since 2016 Wikipedia accepts VP8 and VP9 video formats.
As stated at VP9 Wikipedia, VP9 is supported in the following browsers: Chromium, Google Chrome, Opera, Firefox, Microsoft Edge, and Safari. “In March 2016 an estimated 65 to 75% of browsers in use on desktop and notebook systems were able to play VP9 videos in HTML5 webpages.”
Up-to-date browser support for VP9, “AV1 Video Format, meant to succeed its predecessor VP9” on CanIUse.com.
|Licensing and patents||
According to VP9 Wikipedia, “March 2019, Luxembourg-based Sisvel announced the formation of patent pools for VP9 and AV1.”
The WebM Project and Google are aware of the Sisvel Video Coding Licensing Program patent pools, stating “While open source, royalty free and/or no charge technologies are widely offered, there is no way to prevent third parties from demanding licensing fees on these types of technologies."
According to Phil Cluff in Did Sisvel AOM with Their Patents Down?, 2019, “Sisvel International S.A. announced two new patent pools, one for the VP9 video codec and one for the AV1 video codec...This pool seems to cover any device which houses a hardware decoder for either VP9 and AV1...Both AV1 and VP9 are marketed as ‘Royalty Free’ codecs by the Alliance for Open Media (AOM) and Google respectively, but it sees, that Sisvel doesn’t agree with statement...Their video specifically flags AV1 and VP9 as "FREE?" codecs, saying they still contain approaches based on patent encumbered technologies.”
Sisvel Supporting Links:
As stated by Jan Ozer in VP9 Codec: Google’s Open-Source Technology Explained, 2021, “Sisvel launched a patent pool for VP9 (and AV1) in March 2019 seeking royalties on consumer devices but not VP-encoded content...Since Sisvel isn’t seeking royalties on content, the pool should have minimal impact on streaming producers considering publishing with the VP9 codec.”
Depends upon algorithms and tools to read.
WebM Editors per Digiarty Software, Inc.:
System-on-a-Chip (SoC) manufacturers supporting VP9 list.
Supports the inclusion of metadata.
Per WebMProject.org HDR10+ Metadata Handling, “HDR10+ metadata can be specified in the form of ITU-T T.35 terminal codes. See the BlockAddID element in the WebM Container Guidelines. ATSC 2094-40/CTA-861.4 define one of the possible ways to specify HDR10+ metadata.”
Elecard.com’s page, HDR in Depth, April 2022, provides an overview of Standard Dynamic Range (SDR) and High Dynamic Range (HDR), the main HDR standards, and validation for video formats, VP9, among others.
None beyond availability of supporting software/hardware.
|Technical protection considerations||
WebMProject.orgVP Codec ISO Media File Format Binding provides information on “ISO Base Media Track for video encoded with Video Partition structured video codecs ("VP"),” listing ISO/IEC 23001-7—Common encryption in ISO base media file format files as a Normative Reference. Common Encryption for VP video streams is specified, “If the VP9 data is encrypted, the Protection Scheme Info box ('sinf') SHALL be present, and SHALL contain a Scheme Type ('schm') box. The scheme_type field of the 'schm' box SHALL be 'cenc', indicating that AES-CTR encryption is used when samples are encrypted.”
“RTP packets using the payload format defined in this specification are subject to the security considerations discussed in the RTP specification [RFC3550]...It is not an RTP payload format's responsibility to discuss or mandate what solutions are used to meet the basic security goals like confidentiality, integrity and source authenticity for RTP in general. This responsibility lays on anyone using RTP in an application... Applications SHOULD use one or more appropriate strong security mechanisms... Implementations of this RTP payload format need to take appropriate security considerations into account.”
Good support. WebMProject.org, “VP9 uses 16 bits for width and height, for a maximum resolution for 65536 x 65536 pixels. Neither VP9 nor VP8 place any restriction on framerate or datarate.”
FFmpeg and VP9 Encoding Guide, last updated 6 months ago, “VP9 offer different rate control modes, which determine the quality and file size...libvpx-vp9 offers a simple variable bitrate (VBR) mode by default.” VBR mode tries to reach the specified bit rate on average, higher bit rate, better quality.
|Clarity (high image resolution)||
Good support. Also stated by Sreejata Basu in the blog, Decoding the VP9 Codec, October 2021, “VP9 is a great choice for delivering Over-The-Top (OTT) video on desktop as it works smoothly on PCs at high resolutions. It can also save a good amount of bandwidth while delivering the same or better quality...The better support for HD+ and 360-degree videos also make it a great choice for delivering high quality video.”
Per Developers.Google.com, Recommended Setting for VOD, “VP9 supports a range of frame sizes, from tine resolutions through 4K. Larger frame sizes give higher quality but they require more bandwidth to deliver, and more processing power to decode.”
|Functionality beyond normal rendering||
Some support, scalability. According to the RTP Payload Format for VP9 Video, “The VP9 codec can maintain up to eight reference frames. It also allows a frame to use another frame of a different resolution as a reference frame, allowing internal resolution changes without requiring the use of key frames. Those features together enable VP9 to implement various forms of coarse-grained scalability, including temporal, spatial, and quality scalability modes.”
|Filename extension||Not applicable.|
|Internet Media Type||video/VP9
||VP9 Wikipedia. See (https://en.wikipedia.org/wiki/VP9#Adoption).|
|Magic numbers||Hex: 0x30395056
|Media Foundation and DirectShow Media Types. See (https://gix.github.io/media-types/).|
||Media Foundation and DirectShow Media Types. See (https://gix.github.io/media-types/).|
|Pronom PUID||See note.||No Pronom PUID as of May 2023|
|Wikidata Title ID||Q3815169
||VP9, open and royalty-free video coding format released by Google in 2013. VP-Next, Next Gen Open, VideoNGOV. See (https://www.wikidata.org/wiki/Q3815169)|
Naming Conventions/Considerations (2 different Codec Names found):
According to WebMProject.org, VP Codec ISO Media File Format Binding, the document “Specifies a general ISO Base Media track and sample format for video encoded with Video Partition structured video codecs ('VP'), such as MPEG VCB (MPEG-4 Part 31), VP8, VP9, and others”
Developer.Mozilla.org document, Web Video Codec Guide:
VP9 was created by On2Technologies as TrueMotion VP9. It is the last official iteration of the TrueMotion series of video formats. According to Wikipedia, On2 Technologies was a small, publicly traded company that designed video codec technology. It was acquired by Google in February of 2010. On2’s VP8 technology became the core of Google’s WebM video file format. Google developed VP9 and it was released on June 17, 2013. According to Calvin Wankhede of androidauthority.com, Google developed VP9 as a free and open codec to avoid dealing with H.265's confusing royalty situation.