Implementing Lower Latency, Fast Startup and Switching for low-latency low-delay (L3D) DASH

Low-latency video streaming is essential for interactive applications such as sports betting and live concerts. The sixth edition of the MPEG DASH specification introduces new features enabling the L3D-DASH (Low Latency, Low Delay DASH) approach, which aims to minimize startup times and playback latencies. This paper presents an overview of L3D-DASH and details its implementation on the encoder and packager side, as well as on the client-side. We describe the encoding and packaging pipeline optimized for ultra-low-latency, including parallel video streams with distinct IDR placement strategies and the use of the Live Media Ingest protocol for efficient media delivery. On the client side, we discuss the implementation in dash.js and the challenges of L3D-DASH, such as adaptive bitrate switching and precise playback start and seeking. We then compare the performance of L3D DASH against classic non low latency DASH content. Initial results demonstrate that L3D-DASH achieves faster startup and a more stable low latency playback compared to classic DASH content. These findings highlight the potential of L3D-DASH to advance the state of low-latency streaming and improve user experience in latency-sensitive scenarios.