Contact emailsdalecur...@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 bughttps://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/CAPUDrwdSRdjOa1tS%3Dptmvcbs5zn9Mh0y%3DCx6ynaNtKLz0UOtcg%40mail.gmail.com.
