On 8/7/18 6:21 AM, Jean-Yves Avenard wrote:
We have web-platform-tests for this feature which have landed… We know that 
YouTube intends to use this new functionality as soon as available.
http://w3c-test.org/media-source/mediasource-changetype.html
http://w3c-test.org/media-source/mediasource-changetype-play.html

Right, I meant tested against actual sites.

As far as test is concerned, limiting the type of codecs used was an artificial 
limitation to start with. So the core code involved has always been exercised 
since the MSE rearchitecture (which came with 42)

Great, thank you.

Chrome has it implemented behind a pref too, we haven’t discussed with others 
to determine their intention on that…

OK. Do you have any signals at all from Safari and Edge? Even just knowing "not opposed in current form but no concrete plans to implement" would be useful, compared to them suddenly coming back with requests for changes in the spec.

Google’s main interest for this is for ad insertions unfortunately, a bit sad 
when there’s so much potential.

Does this make the ad insertion case better for our users in some way, at least?

The implementation behind changeType followed several iterations to reach that 
point.

Ah, OK.  That makes sense.

I hope I answered all your questions.

Yes, thank you. This sounds reasonable to ship without a pref at all (which is the actual proposal here, just so everyone is clear), especially if we are fairly sure that Safari and Edge won't end up objecting to the spec.

-Boris
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