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When ChunkSource implementations implement multi-track for DASH and SS, format selection will move inside of ChunkSource. If we, for example, fail to query the decoder to determine which tracks are playable, we need an opportunity to fail (i.e. say we're not prepared, so that maybeThrowError is called, from which we can throw). This may go away in the future if we remove the distinct preparation step and treat tracks/formats as things that can change dynamically, but for now this is what we have. Issue #514.