On 7/5/23 8:57 PM, 'Eugene Zemtsov' via blink-dev wrote:
Intent to Implement and Ship: Per-frame quantizer in VideoEncoder
Contact emails
ezemt...@google.com
Explainer
None
Specification
https://www.w3.org/TR/webcodecs/#video-encoder-bitrate-mode
<https://www.w3.org/TR/webcodecs/#video-encoder-bitrate-mode>
Summary
Adds "quantizer" VideoEncoderBitrateMode for VideoEncoder. This allows
to specify a quantizer parameter for each frame for AV1, VP9, and AVC
video codecs. The quantizer parameter is set via codec specific
extensions for VideoEncoderEncodeOptions.
Assuming I know very little about video codecs, what use cases does this
enable for developers?
Blink component
Blink>Media>WebCodecs
<https://bugs.chromium.org/p/chromium/issues/list?q=component:Blink%3EMedia%3EWebCodecs>
TAG review
None.
Previously WebCodecs API had TAG review as a whole:
https://github.com/w3ctag/design-reviews/issues/612
<https://github.com/w3ctag/design-reviews/issues/612>
This is a new addition since that review, but it's a trivial addition
(IMHO) so a new review request isn't needed.
TAG review status
Not applicable
Risks
Interoperability and Compatibility
Gecko: Neutral
(https://github.com/mozilla/standards-positions/issues/837#issuecomment-1614666364
<https://github.com/mozilla/standards-positions/issues/837#issuecomment-1614666364>)
Paul Adenot (Mozilla) expressed that minor changes to WebCodecs spec
don't need to go through the full "Request for Mozilla Position"
process assuming they were approved by the Media Working Group.
WebKit: Positive
(https://www.w3.org/2023/03/07-mediawg-minutes.html#t02
<https://www.w3.org/2023/03/07-mediawg-minutes.html#t02>) The issue
was discussed on 07 March 2023 by w3c Media working group. Jer Noble
(Apple) was actively participating and provided input for spec details.
Can we request a formal position from WebKit, at least to let them know
we're intending to ship?
Web developers: Positive (https://github.com/w3c/webcodecs/issues/56
<https://github.com/w3c/webcodecs/issues/56>) People ask for this on
GitHub
Other signals:
WebView application risks
Does this intent deprecate or change behavior of existing APIs, such
that it has potentially high risk for Android WebView-based applications?
Will this feature be supported on all six Blink platforms
(Windows, Mac, Linux, Chrome OS, Android, and Android WebView)?
Yes
Is this feature fully tested by web-platform-tests
<https://chromium.googlesource.com/chromium/src/+/main/docs/testing/web_platform_tests.md>?
Yes
Tracking bug
https://bugs.chromium.org/p/chromium/issues/detail?id=1424154
<https://bugs.chromium.org/p/chromium/issues/detail?id=1424154>
Estimated milestones
Shipping on desktop
117
Shipping on Android
117
Link to entry on the Chrome Platform Status
https://chromestatus.com/feature/5783986600673280
<https://chromestatus.com/feature/5783986600673280>
--
Thanks,
Eugene Zemtsov.
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