Re: [w3ctag/design-reviews] Data for measuring audio-video synchronization and end-to-end delay in realtime communications (#493)

Thanks for the reply! Sorry for not having checked it earlier. 

> As I understand it this exposes an integral of the intermediate latencies that it has seen on the communication path to be used as a synchronization hint. (Given the right set of samples it could maybe be used to unmask the actual intermediaries, but that's given the right samples that are short enough in terms of hops) This goes wildly outside of my field of expertise, but would this have any security/privacy implications? There isn't a S&P self assessment, so wasn't able to refer to that.

As it measures latency, the only privacy implication we can think of is that one maybe can infer the location of a participant in a real-time calling, but still very roughly. 

> 
> The other question was around other implementor interest; this isn't the right venue to solicit other implementor interest so we'd like to know if there was anything that was said from other implementors. It seems there are some extensions on WebRTC that only one implementation implement, which added up could result in fragmentation in the long run.

The proposal has been presented to W3C WG and browser implementers. While there is no signal from other implementers to implement this yet, the proposal has been reviewed without concerns raised.

It is true that some WebRTC extensions (including this one) are not yet standardized. Some popular applications are using them to improve their quality, and WebRTC also needs to learn from these applications to decide the next step, and normally that takes time.

> 
> I agree with the comments from @dbaron above on this being better suited for review from the IETF end.



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