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Per-frame quantizer in VideoEncoder

Category

Multimedia

Type

Chromium catches up

Status

Enabled by default (Chrome 117)

Intent stage

None

• Breaking change: No
• Enterprise impact: None
• Spec maturity: Published standard
• Web Platform Tests: Yes

Summary

Adds "quantizer" VideoEncoderBitrateMode for VideoEncoder. This allows to specify quantizer parameter for each frame for AV1, VP9, and AVC video codecs. Explainer: https://gist.github.com/Djuffin/3722232679b977058be787be0dff4254

Standards & signals

• Specification: https://www.w3.org/TR/webcodecs/#video-encoder-bitrate-mode
• Firefox: Neutral — Paul Adenot (Mozilla) expressed that minor changes to WebCodecs spec don't need to go through full "Request for Mozilla Position" process assuming they were approved by the Media Working Group.
• Safari: Positive — The issue was discussed on 07 March 2023 by w3c Media working group. Jer Noble (Apple) was actively actively participating and provided input for spec details. https://www.w3.org/2023/03/07-mediawg-minutes.html#t02
• Web developers: Positive — People ask for this on GitHub
• Tracking bug: https://bugs.chromium.org/p/chromium/issues/detail?id=1424154

Ecosystem

• Web Platform Tests: https://wpt.fyi/results/?q=per-frame-quantizer-in-videoencoder
• Chrome Platform Showcase: https://chrome-platform-showcase.paulkinlan-ea.deno.net/features
• GenDN reference: https://gendn.paulkinlan-ea.deno.net/features
• chrome.dev demos search: https://www.google.com/search?q=site%3Achrome.dev+Per-frame%20quantizer%20in%20VideoEncoder
• MDN Web Docs: https://developer.mozilla.org/en-US/search?q=Per-frame%20quantizer%20in%20VideoEncoder
• Baseline status: https://webstatus.dev/?q=Per-frame%20quantizer%20in%20VideoEncoder

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