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Explainer None Specification https://w3c.github.io/media-source Summary The Media Source standard long ago changed to disallow ambiguously defined behavior involving asynchronous range removals: * SourceBuffer.abort() no longer aborts SourceBuffer.remove() operations * Setting MediaSource.duration can no longer truncate currently buffered media Exceptions will be thrown in both of these cases now. Safari and Firefox have long shipped this behavior, Chromium is the last browser remaining with the old behavior. Use counters show ~0.001%-0.005% of page loads hit the deprecated behavior. Primarily small Russian sites. If a site hits this issue, playback may now break. Usage of abort() cancelling removals is increasing, so it's prudent to resolve this deprecation before more incompatible usage appears. Blink component Internals>Media>Source TAG review None TAG review status Not applicable Risks Interoperability and Compatibility Safari and Firefox have long shipped this behavior, Chromium is the last browser remaining with the old behavior. Use counters show ~0.001%-0.005% of page loads hit the deprecated behavior. Primarily small Russian sites. If a site hits this issue, playback may now break. Gecko: Shipped/Shipping (https://searchfox.org/mozilla-central/rev/e703d3fbd6da82cdda1256016a80abb1f245fedd/dom/media/mediasource/MediaSource.cpp#666) Ships both abort() and setDuration() restrictions. WebKit: Shipped/Shipping (https://github.com/WebKit/WebKit/blob/1afe2bf63106ce2c22fe78926d629780c2b6fd6a/Source/WebCore/Modules/mediasource/MediaSource.cpp#L732) Ships both abort() and setDuration() restrictions. Web developers: No signals Bug has 25 +1s so developers are hitting this discrepancy, but no direct feedback. 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? Yes. WebView based players using Media Source Extensions will be affected. Debuggability Clear exceptions are thrown when this issue occurs. Will this feature be supported on all six Blink platforms (Windows, Mac, Linux, ChromeOS, Android, and Android WebView)? Yes Is this feature fully tested by web-platform-tests? Yes https://wpt.fyi/results/media-source/mediasource-duration.html https://wpt.fyi/results/media-source/mediasource-remove.html Flag name on about://flags MediaSourceNewAbortAndDuration Finch feature name MediaSourceNewAbortAndDuration Rollout plan Will ship enabled for all users Requires code in //chrome? False Tracking bug https://issues.chromium.org/issues/40474569 Measurement https://chromestatus.com/metrics/feature/timeline/popularity/1428 (0.004970% of page loads) https://chromestatus.com/metrics/feature/timeline/popularity/1429 (0.001454% of page loads) Usage of abort() cancelling removals is increasing, so it's prudent to resolve this deprecation before more incompatible usage appears. Estimated milestones Shipping on desktop 138 Shipping on Android 138 Shipping on WebView 138 Anticipated spec changes Open questions about a feature may be a source of future web compat or interop issues. Please list open issues (eg links to known github issues in the project for the feature specification) whose resolution may introduce web compat/interop risk (eg, 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/5190983595327488?gate=5206078123671552 This intent message was generated by Chrome Platform Status. -- 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 visit https://groups.google.com/a/chromium.org/d/msgid/blink-dev/682376d1.170a0220.2aa17e.00d4.GAE%40google.com.
