LGTM3

On Saturday, June 6, 2026 at 10:04:09 AM UTC+2 Guido Urdaneta wrote:

> On Sat, Jun 6, 2026 at 5:16 AM Sangwhan Moon <[email protected]> wrote:
>
>>
>> On Jun 4, 2026, at 5:00, 'Guido Urdaneta' via blink-dev <
>> [email protected]> wrote:
>>
>> 
>>
>>
>> On Wed, Jun 3, 2026 at 5:22 PM Daniel Bratell <[email protected]> 
>> wrote:
>>
>>> Looking through the request, while I note that it's a small change there 
>>> is also quite a few fields not filled in. For instance, no explicit 
>>> requests for official Mozilla or WebKit standards positions, no TAG review, 
>>> no web developer position, and more. 
>>>
>> Could we get some motivation for skipping those fields, or if they should 
>>> not be skipped, well, updated info?
>>>
>> For TAG review: This is a minor addition (with consensus across browsers 
>> in a WG) to a spec that already has a TAG review. In the past, this type of 
>> small addition to an already reviewed spec was usually exempted from a new 
>> TAG review. We can request one if you think it's necessary. This is the TAG 
>> review of the original spec: 
>> https://github.com/w3ctag/design-reviews/issues/603
>>
>> For standards positions:
>> https://github.com/mozilla/standards-positions/issues/1417
>> https://github.com/WebKit/standards-positions/issues/679
>>
>> Officially this is "No Signals", since they positions were just 
>> requested.  In practice, though, the spec change had the explicit approval 
>> of the Mozilla and WebKit representatives. See 
>> https://github.com/w3c/mediacapture-transform/pull/125
>>
>>
>> Original TAG reviewer here. It seems like Mozilla is indirectly 
>> expressing concerns (I somehow missed this, although the comments did come 
>> 3 years after it was closed) on the original review (which I missed), were 
>> the details of the concerns brought up in another forum?
>>
>
> Their main concern was exposure on Window. Since this API is closely 
> related to WebCodecs the decision was to align with WebCodecs and ship it 
> on Window too.
> See the I2S: 
> https://groups.google.com/a/chromium.org/g/blink-dev/c/oo6MQoRbDXk/m/7Kjjfe9NAwAJ
>
>  
>
>>
>>
>> Regarding developer support: We reported "No Signals," which in this case 
>> actually means no public signals since we do not have we can link to.
>> Internally we are aware of positive signals from developers, but they're 
>> not public.
>> There is one developer comment here 
>> <https://github.com/w3c/mediacapture-transform/issues/122#issuecomment-3822679209>,
>>  
>> but I'm not sure it meets the threshold for a positive signal. 
>> Another developer participated in a discussion about an earlier proposal 
>> of this feature in the WG and their feedback was incorporated into the 
>> final proposal: https://youtu.be/BFxA2GavBnI?t=4798
>> It does not refer to the finalized version that landed in the spec, but 
>> maybe all taken into consideration this amounts to "Positive signals".
>>
>> Please let us know if there is any other field that requires more 
>> information.
>>
>>  
>>
>>> /Daniel
>>>
>>>
>>> On 2026-06-01 20:43, 'Dan Clark' via blink-dev wrote:
>>>
>>> LGTM2
>>>
>>> On Monday, June 1, 2026 at 11:39:09 AM UTC-7 [email protected] 
>>> wrote:
>>>
>>>> LGTM1
>>>>
>>>> On Monday, June 1, 2026 at 5:41:52 AM UTC-7 Chromestatus wrote:
>>>>
>>>>> *Contact emails*
>>>>> [email protected], [email protected]
>>>>>
>>>>> *Specification*
>>>>> https://www.w3.org/TR/mediacapture-transform/#track-processor-interface 
>>>>>
>>>>> *Summary*
>>>>> Adds discardedFrames and totalFrames attributes to the 
>>>>> MediaStreamTrackProcessor interface. These counters allow web developers 
>>>>> to 
>>>>> monitor the health of their media processing pipelines by tracking the 
>>>>> number of frames received and dropped by the processor. 
>>>>>
>>>>> *Blink component*
>>>>> Blink>MediaStream 
>>>>> <https://issues.chromium.org/issues?q=customfield1222907:%22Blink%3EMediaStream%22>
>>>>>
>>>>> *Web Feature ID*
>>>>> insertable-streams <https://webstatus.dev/features/insertable-streams> 
>>>>>
>>>>> *Motivation*
>>>>> *No information provided* 
>>>>>
>>>>> *Initial public proposal*
>>>>> *No information provided*
>>>>>
>>>>> *TAG review*
>>>>> *No information provided* 
>>>>>
>>>>> *TAG review status*
>>>>> Not applicable
>>>>>
>>>>> *Goals for experimentation*
>>>>> None 
>>>>>
>>>>> *Risks*
>>>>>
>>>>>
>>>>> *Interoperability and Compatibility*
>>>>> *No information provided* 
>>>>>
>>>>> *Gecko*: Positive (
>>>>> https://github.com/w3c/mediacapture-transform/pull/125) Spec PR was 
>>>>> approved by Mozilla 
>>>>>
>>>>> *WebKit*: Positive (
>>>>> https://github.com/w3c/mediacapture-transform/pull/125) Spec PR was 
>>>>> approved by WebKit 
>>>>>
>>>>> *Web developers*: No signals
>>>>>
>>>>> *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? 
>>>>> *No information provided* 
>>>>>
>>>>>
>>>>> *Debuggability*
>>>>> *No information provided* 
>>>>>
>>>>> *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 
>>>>> third_party/blink/web_tests/wpt_internal/mediacapture-insertable-streams/MediaStreamTrackProcessor-stats.https.html,
>>>>>  
>>>>> third_party/blink/web_tests/wpt_internal/mediacapture-insertable-streams/MediaStreamTrackProcessor-stats-transfer.https.html
>>>>>
>>>>> *Flag name on about://flags*
>>>>> *No information provided* 
>>>>>
>>>>> *Finch feature name*
>>>>> MediaStreamTrackProcessorStats 
>>>>>
>>>>> *Rollout plan*
>>>>> Will ship enabled for all users
>>>>>
>>>>> *Requires code in //chrome?*
>>>>> False
>>>>>
>>>>> *Tracking bug*
>>>>> https://issues.chromium.org/issues/513481577
>>>>>
>>>>> *Estimated milestones*
>>>>> Shipping on desktop 150 
>>>>> Shipping on Android 150 
>>>>> Shipping on WebView 150 
>>>>>
>>>>> *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). 
>>>>> *No information provided*
>>>>>
>>>>> *Link to entry on the Chrome Platform Status*
>>>>> https://chromestatus.com/feature/6267249280286720?gate=4665260125585408
>>>>>
>>>>> This intent message was generated by Chrome Platform Status 
>>>>> <https://chromestatus.com>. 
>>>>>
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