[POC} Only load media segments for Representations known to be decipherable #1488
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Historically, the RxPlayer load media segments and perform the license-fetching logic in parallel, as it theoretically lead to faster playback when all qualities are decipherable.
However, this has always only been a theory and it may have the reverse effect on devices where we're not able to obtain all keys (this also is only theoretical).
To better know what the impact of loading media segments in parallel or after the license, I'm here only loading media segments (not the initialization segment, which can be loaded right away) either if the Representation is clear or is known to be decipherable.
This is only a Proof-Of-Concept with for now no intent to make it a feature.