LGTM2 On Tue, Oct 24, 2023 at 7:05 PM Dale Curtis <dalecur...@chromium.org> wrote:
> WMF has long switched away from Theora (to VP9) per prior discussions with > them and seconded by this comment: > https://phabricator.wikimedia.org/T329258#9275042 > > Switching to H264+MP4 is not necessary to avoid this deprecation. VP9+MP4, > VP9/VP8+WEBM, or even VP8+OGG are all more viable open codec options. > > - dale > > On Mon, Oct 23, 2023 at 8:41 PM Yuhong Bao <yuhong.bao....@gmail.com> > wrote: > >> >> I am asking the WMF to add MP4: >> https://phabricator.wikimedia.org/T329258 >> On Monday, October 23, 2023 at 8:53:14 AM UTC-7 Dale Curtis wrote: >> >>> Contact emailsdalec...@chromium.org >>> >>> ExplainerNone >>> >>> Specificationhttps://en.wikipedia.org/wiki/Theora >>> >>> Summary >>> >>> Chrome will deprecate and remove support for the Theora video codec in >>> desktop Chrome due to emerging security risks. Theora's low (and now often >>> incorrect) usage no longer justifies support for most users. Notes: - Zero >>> day attacks against media codecs have spiked. - Usage has fallen below >>> measurable levels in UKM. - The sites we manually inspected before levels >>> dropped off were incorrectly preferring Theora over more modern codecs like >>> VP9. - It's never been supported by Safari or Chrome on Android. - An >>> ogv.js polyfill exists for the sites that still need Theora support. - We >>> are not removing support for ogg containers. Our plan is to begin >>> escalating experiments turning down Theora support in M120. During this >>> time users can reactivate Theora support via >>> chrome://flags/#theora-video-codec if needed. The tentative timeline for >>> this is (assuming everything goes smoothly): - ~Oct 23, 2023: begin 50/50 >>> canary dev experiments. - ~Nov 1-6, 2023: begin 50/50 beta experiments. - >>> ~Dec 6, 2023: begin 1% stable experiments. - ~Jan 8, 2024: begin 50% stable >>> experiments. - ~Jan 16th, 2024: launch at 100%. - ~Feb 2024: remove code >>> and chrome://flag in M123. - ~Mar 2024: Chrome 123 will roll to stable. >>> >>> >>> Blink componentInternals>Media>Codecs >>> <https://bugs.chromium.org/p/chromium/issues/list?q=component:Internals%3EMedia%3ECodecs> >>> >>> Search tagstheora <https://chromestatus.com/features#tags:theora>, vp3 >>> <https://chromestatus.com/features#tags:vp3>, video >>> <https://chromestatus.com/features#tags:video> >>> >>> TAG reviewNone >>> >>> TAG review statusNot applicable >>> >>> Risks >>> >>> >>> Interoperability and Compatibility >>> >>> Sites which only provide a Theora video source will no longer have video >>> playback. These sites would already be broken in Chrome for Android or >>> Safari. >>> >>> >>> *Gecko*: Under consideration Private discussions. I asked if they'd >>> like an RFP for this, but haven't yet heard back. >>> >>> *WebKit*: Shipped/Shipping (https://caniuse.com/ogv) Safari never >>> shipped support for Theora. >>> >>> *Web developers*: Mixed signals Most developers are not likely to have >>> an opinion, some may lament the loss of one of the first open codecs on the >>> web. >>> >>> *Other signals*: >>> >>> Security >>> >>> Security positive change -- removes support for a complicated binary >>> parsing and decoding mechanism. >>> >>> >>> 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? >>> >>> None, never supported on Android or WebView. >>> >>> >>> Debuggability >>> >>> Can be debugged through media dev tools or chrome://media-internals. >>> >>> >>> Will this feature be supported on all six Blink platforms (Windows, Mac, >>> Linux, Chrome OS, Android, and Android WebView)?Yes >>> >>> Not currently supported on Chrome for Android. >>> >>> >>> Is this feature fully tested by web-platform-tests >>> <https://chromium.googlesource.com/chromium/src/+/main/docs/testing/web_platform_tests.md> >>> ?Yes >>> >>> As part of pre-work, I've switched all tests using Theora (of which >>> there were hundreds) over to using VP8/VP9 where appropriate. >>> >>> >>> Flag name on chrome://flagsTheoraVideoCodec >>> >>> Finch feature nameTheoraVideoCodec >>> >>> Requires code in //chrome?False >>> >>> Tracking bug >>> https://bugs.chromium.org/p/chromium/issues/detail?id=1489034 >>> >>> Estimated milestones >>> DevTrial on desktop 120 >>> >>> Anticipated spec changes >>> >>> Open questions about a feature may be a source of future web compat or >>> interop issues. Please list open issues (e.g. links to known github issues >>> in the project for the feature specification) whose resolution may >>> introduce web compat/interop risk (e.g., changing to naming or structure of >>> the API in a non-backward-compatible way). >>> None >>> >>> Link to entry on the Chrome Platform Status >>> https://chromestatus.com/feature/5158654475239424 >>> >>> This intent message was generated by Chrome Platform Status >>> <https://chromestatus.com/>. >>> >> -- > You received this message because you are subscribed to the Google Groups > "blink-dev" group. > To unsubscribe from this group and stop receiving emails from it, send an > email to blink-dev+unsubscr...@chromium.org. > To view this discussion on the web visit > https://groups.google.com/a/chromium.org/d/msgid/blink-dev/CAPUDrwcHS-cEzLXpJ6HTkQC-GU9eRhsjXg3wNBfLZX%3DTcF-Tiw%40mail.gmail.com > <https://groups.google.com/a/chromium.org/d/msgid/blink-dev/CAPUDrwcHS-cEzLXpJ6HTkQC-GU9eRhsjXg3wNBfLZX%3DTcF-Tiw%40mail.gmail.com?utm_medium=email&utm_source=footer> > . > -- You received this message because you are subscribed to the Google Groups "blink-dev" group. 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