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--- wiki:regional_stat_mux [2017/10/18 21:56] – [MFEL Stat Mux] walkeradmin
+++ wiki:regional_stat_mux [2023/03/09 22:35] (current) – external edit 127.0.0.1
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 ====== Regional Stat Mux ======
 <color #db5f0b>Oct 2017</color>
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 ===== Introduction =====
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+----
+===== Overview =====
+When looking at National and Regional services, the regional service is switched in to replace a national service, in the past this has been performed by two processes:
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+<file>
+. Encode Regional Services in CBR
+. Remove enough bit rate from the National Reflex pool to fit in the CBR service
+. Switch in National CBR service
+</file>
+This process involved a lot of system re-configuration, albeit that can be automated.
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+{{:wiki:regional_stat_mux_mfel.jpg?600|}}
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+What the Regional Stat Mux in the MFEL does is quite different. Rather than reducing the video pool size, and running regional services in CBR, we include regional services in the stat mux. Please note that all regional services will get the same bit rate.
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+Lets take an example where you have a 20Mb/s video pool with 3 National and 1 regional service. The national and regional services are all part of that 20Mb/s pool. Lets say that in an instance in time, the regional service gets 4Mb/s, all other regional services will also get 4Mb/s. This means that you can switch in and out any regional service, and it will still fit perfectly in to the 20Mb/s video pool, so saving switching to and from CBR, and changing video pool sizes.
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-===== MFEL Configuration ====
+===== MFEL Configuration =====
 Below is an image of an MFEL Configuration for Regional Stat Mux. We can see that there are three National Services and two Regional Services.
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+===== Regional Stat Mux Parameters =====
+The amount of bits the regional services get, relative to their content is controllable to a point. The options are configured in the Console and the settings are below.
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+The regional subgroup complexity can be computed in various ways, thanks to an advanced parameter:
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+    statmux.smxRegionalCpxMode:
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+<file>
+: smart average: compute the average complexity of the regional subgroup with removing the outliers. (Default value).
+: average complexity: compute the average complexity of the regional subgroup.
+: maximal complexity: compute the maximal complexity of the regional subgroup.
+</file>
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+----
 ===== MFSP Configuration  =====
 In this example, the MFSP is really just doing remux to create MPTS streams from the SPTS streams coming in from the MFEL.
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-===== Overview =====
+===== To Recap =====
 The MFEL is encoding 3 National Services and 1 Regional Service using a defined Stat Mux Pool size (20Mbs a second in our case). However, each Regional Service gets the same bits. So we are encoding Regional 1 and Regional 2 using the same bit rate. See below for an example of the Stat Mux bit rates.
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 {{:wiki:mfsp_bit_rate_graph_regional_stat_mux.mp4|950x574|autoplay,loop}}
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+==== Dektec Output ====
-==== end ====
+Here we can see three Dektec windows. Top Left is TS1 output from the MFSP (so National 1,2 & 3 plus Regional 1). Top Right is the output from the MFSP for TS1 (so National 1,2 &4 plus Regional 2). The bottom window is a TS that contains only the two regional services, which remember have completely different content, but identical bit rate.
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+{{:wiki:dektec_regional_stat_mux.mp4|950x574|autoplay,loop}}
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