Video - April 2017

April 2017

Video Test - Buffering Events

TrueNet measures the number of buffer events that occur in our standard video test. Buffer events are when when the video stream appears to stop, while waiting for additional data.

Methodology

TrueNet's video test chooses specific videos ( This month two videos, an HD one and an identical content 4K video)  The video will be cached (stored locally) by ISPs in NZ for all viewers, simply because we are downloading the video seven times a minute from 400+ different NZ addresses.

Each test downloads 10 seconds of content at a time, to fill any buffer to last 40 seconds.   So on startup, the test will immediately download (at full speed) 40 seconds of content, after a time gap (to allow for playback) it will then download a second 40 seconds of content, simulating keeping the 40 second playback buffer full.  This appears to be an international standard for consumer video testing.

TreuNet records buffer events by counting "Stops", where the simulated buffer would become empty.   We also record Resume and Finished events.   Chart 1 shows a count of the number of "Stops" (sometimes more than one in a single download attempt).

We also measure the start delay, ie the time taken for a video to start downloading so it can play.  The typical period for this is so small, usually less than 1 second, that we no longer publish this statistic.

Buffering Events during youtube Watching

Chart 1: Buffering Events by Day

Chart 2: Buffering Events for the Month

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