Update 01-l3d.inc.md

specs/l3d/01-l3d.inc.md

@@ -6,10 +6,40 @@ This feature description is an update to DASH-IF Low-Latency extensions [[!IOP5-
 
 ## Scenarios and Motivation ## {#l3d:scenarios}
 
-In 2017, [DVB](https://www.dvb.org) and [DASH-IF](https://www.dashif.org) started to collaborate to address 
+In 2017, [[DVB]](https://www.dvb.org) and [[DASH-IF]](https://www.dashif.org) started to collaborate to address 
 Low-Latency DASH-based services. Initially, a joint group was formed that developed a report that was issued 
 by DVB/DASH-IF as _DASH-IF/DVB Report on Low-Latency Live Service with DASH_ [[!LL-REPORT]].
 
+* Reviewing the Report - what has changed
+    * Do have new requirements in terms of latency < 3 seconds?
+        * There are new requirements that sports events may needed less than 3 seconds, but not that hard
+        * We have the report here: [https://dashif.org/webRTC/report](https://dashif.org/webRTC/report)
+            * Betting use case may be of relevance.
+            * Please check if any of the use case matter as is or in variants for the work we are planning top
+    * Do we have new requirements to tune and switching?
+        * faster tune-in, time to first video is very important and should be low (1-2 seconds may be too high)
+        * Start playback faster – do not wait for up to 2 seconds
+        * Faster switching to avoid buffering
+        * Independency of joining latency, switching latency and segment duration
+    * Do we have new requirements for efficiency?
+        * _Compression efficiency_
+        * _Enables scene-boundary aligned segments_
+        * _Mini-GOP-sized partial segments for random access and events_
+    * Are there any new use cases that requires new technology?
+        * Ad insertion w/o stream conditioning
+            * Return from ad break to an arbitrary place – not necessarily an IDR
+        * LL-HLS compatibility
+            * Reuse LL-HLS partial segments
+            * Use DASH templates to keep same MPD update efficiency
+        * Trick modes
+            * Small partial segments can be used for smoother trick play
+    * Did the defined technology for LL-DASH not meet the requirements?
+        * The technology may meet the requirements in terms of latency, but at the expense of reduced quality, including more re-buffering and/or reduced compression efficiency
+        * Today's technology typically requires that segment durations are in the range of 2 seconds. 
+* Next Steps
+    * add the above logic to the introduction of the feature.
+    * Start documenting the technology by reference to 6th edition
+    * also document client requirements
 
 ## Content Offering Requirements and Recommendations ## {#l3d:content-offering}