"Canonical" solution for identifying multiple streams?

[floe]

I have an application where I'm dealing with multiple video streams in one connection. AFAICT, there doesn't seem to be any built-in way to uniquely identify the different streams? As the mid is autogenerated and read-only, I currently use a separate mapping, sent out-of-band along with the SDP, that identifies which mid in the SDP belongs to which stream source (using the transceiver IDs). However, this feels like a rather convoluted hack, so is there any other solution people use in this scenario?