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Content Level QOS
  • 20 Jun 2023
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Contents

Content Level QOS

  • Updated on 20 Jun 2023
  • 1 Minute to read
  • Contributors
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Article summary

Monitor content streaming quality in real-time using the Content Level QOS report. To navigate to the report, from the Dashboard 360 menu, go to Real-Time in the left navigation, and click Content Level QOS. As you can see, the report organizes content into different categories, including Video title, Series title, Genre, Fast channel, and Platform.

The Content Level QOS report is updated every 30 minutes. You can change the default time frame using the Time Frame filter on the upper-right corner of the page. Real-time reports are stored for 24 hours. Note that the data is collected in real-time and may not have been fully processed. If you need accurate data, you should use historical reports.

Metrics
Description
ViewsThe number of views a video receives in real-time.
Buffering RatioBuffering Ratio is a KPI that indicates the quality of the playback experience. A high rebuffering ratio or a significant spike in this metric can be used to diagnose and troubleshoot parts of the delivery network.
Avg. TTFB (time to first byte)TTFB is the time (calculated in seconds) it takes to request information from the server and receive the information that was requested. To put it simply, it is the time between when you click on a video and when it starts to render.  
The streaming starts over a three-step process:
Step 1. Loading master-manifest file(m3u8)(e.g. https://cdn-ue1-prod.tsv2.amagi.tv/asvod/viewlift-example-tv/L34-123-OTT/L34-123-OTT.m3u8)

Step 2. Loading sub-manifest file(m3u8) mentioned inside the master-manifest file. sub-manifests are bitrate/resolution-specific playlists and will be selected by the player based on the bandwidth and other parameters
Step 3. Loading the video segments mentioned inside the sub-manifest file
So TTFB is equal to the sum of time taken in the above 3 steps.

Example:

Let's take an example to understand the TTFB (Time to First Byte) value for a video streaming directly from the origin server/from a cached copy. 

The TTFB for Master Manifest may take about 0.6 seconds. For the Child Manifest, it may be 3.8 seconds, and for the first Video Segment, the TTFB can be 1.6 seconds. When we add up these values, the minimum TTFB on the CDN side is 6 seconds, which is considered reasonable for a long video or playlist.

Avg. Resolution
Displays the average resolution; calculated as width by the height for a video. The unit of measurement of video resolution is Pixels.

% of Plays Failed to StartThe percentage of plays for a video that failed to start.
% of Plays DroppedThe percentage of plays for a video that was dropped.
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