LGTM1 to change the behaviour.
/Daniel
On 2025-05-13 20:30, Dale Curtis wrote:
The plan is to land the change right away given the low usage and long
shipped state on other UAs.
- dale
On Tue, May 13, 2025 at 10:57 AM Daniel Bratell <bratel...@gmail.com>
wrote:
Do you just want to deprecate it (i.e. add some warning when used)
or do you want to do the change right away? Doing the change right
away seems reasonable.
/Daniel
On 2025-05-13 18:44, Chromestatus wrote:
Contact emails
dalecur...@chromium.org
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
<https://issues.chromium.org/issues?q=customfield1222907:%22Internals%3EMedia%3ESource%22>
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
<https://chromium.googlesource.com/chromium/src/+/main/docs/testing/web_platform_tests.md>?
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 (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/5190983595327488?gate=5206078123671552
This intent message was generated by Chrome Platform Status
<https://chromestatus.com>.
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