Statistical Multiplexing of DASH Segments in the ATSC 3.0 System
Abstract: When it comes to ATSC 3.0, uncovering effective ways to optimize bandwidth is the biggest challenge facing broadcasters today. However, the answer to this challenge is available: leverage a statistical multiplexing solution that maximizes the efficiencies of over-the-air distribution of HTTP ABR streams. The statistical multiplexing algorithms – available today with nearly two decades of research – help ensure all channels in a statmux pool are assigned the right amount of bandwidth on a video frame basis to deliver high quality at every point in time. By utilizing a Real Time ROUTE encoder, broadcasters can encapsulate DASH segments into an ATSC 3.0 stream without impacting the ATSC 3.0 gateway itself.The group of services, designated for a single standard RF channel, are statistically multiplexed and individually delivered as VBR ATS streams, the aggregated bitrate of which is fixed and controlled by the HEVC encoder. These ATS streams are packaged in DASH format and published to a ROUTE encoder which maintains original segment encode rate adding a small, fixed overhead. HEVC encoder built-in tools are used to monitor statmux pool bitrate. The tools complementing ROUTE encoder are used to monitor aggregated bitrate of group of services sharing the same frequency after ROUTE layer processing.