With some delay, I’ve put the slides that we presented at MPEG in October 2012, on how to extend MPEG-2 TS and MPEG-DASH to support synchronized playback of streams coming from IP based networks and from MPEG-2 TS based (non-IP) networks. The contribution is here:
J. Le Feuvre and C. Concolato, Extensions for Hybrid Delivery using MPEG-2 TS and DASH, MPEG, Shanghai, China, October 2012, n° M26903 [PDF].
and the slides here: