Hi > On 14 May 2018, at 6:47 pm, Tom Ritter <t...@mozilla.com> wrote: > > It seems like this will reveal a lot of information about the user's > hardware. Does the Resist Fingerprinting preference disable the API or > report standardized results? If not, can we get that bug on file (and > if it's easy, point out exactly where we would want to add the 'if() > return false'?) > > -tom
This is a concern that has been raised previously, and one that you can ultimately get with existing APIs, but those are typically after the fact, and by then it’s already too late to allow the user to have a decent media playback experience Existing canPlayType can tell you if we support a particular codec or not. During playback, we already expose various metrics (starting from bug https://bugzilla.mozilla.org/show_bug.cgi?id=580531) this became an official spec, to determine if the content plays well : number of frames dropped, number of frames decoded, how many were painted etc... As such MediaCapabilities doesn’t expose much more than what someone can already gather over time with what’s already existing. There are various ways we can build the Media Capabilities answer: collecting past metrics and build up a dictionary, or make assumptions based on the decoders (e.g. we know a hardware h264 decoder will always be smooth and power efficient). To get around fingerprinting, at the user’s choice, the obvious work around would be to report that everything is always supported, will always do so smoothly with great battery savings. This is something we already do for the existing apps. The user will end up with a poor video experience however. As it will typically be served content not always adapted to his machine capabilities. Providing a way to ensure the user will get a good video experience is paramount IMHO. Watching video on their web browser is what people do the most… JY
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