Re: [webrtc-pc] Missing specification on how to assign bandwidth between encodings and/or drop simulcast layers (#2141)

Ok. It looks good but IMHO too complex (finally those are 3 new fields!). But indeed if we remove the `minBitrate` field the browser would keep sending all layers even in bad circumstances.

However, you know that current implementations assume they can stop a layer without too much rationale (they just do it). Would that be the effective behavior if `minBitrate` is not given?

I've also some doubts regarding the `weight` parameter. It looks like it may conflict with `scaleResolutionBy`, `maxFramerate` and `maxBitrate`. IMHO the browser should be able to estimate the "weight" of a layer/stream based on those already defined values.

This is, I assume that your suggested `weight` field tells the browser how much percentage of BW it must allocate for each stream. IMHO we don't need that. The encoder should know that better than us based on `scaleResolutionBy`, `maxFramerate` and `maxBitrate` (and I'd love to introduce as less new parameters as possible).

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