This Cedexis crowd-sourced internet
retrieved from multiple CDNs and similar sites,
which provide up to three measurements.
For example, a 43-byte test object measures
latency and response time, while a 102,400-byte
test object measures throughput. These test
objects are retrieved from every major CDN
and cloud provider and some relevant private
platforms. This crowd-sourced data provides
a real-time map of internet performance, and
data regarding the delivery performance from
multiple CDNs to the specific viewer later requesting video, or those proximate to them as
shown in Figure 5.
Cedexis OpenMix is the load-balancing solution that utilizes this
data. Within OpenMix, Cedexis customers identify the CDNs available
for delivery and the business rules
for choosing among them. As Simon
Jones, marketing leader at Cedexis, explained, the factors that can be
incorporated into the decision are
very broad and can be augmented by
third-party data via Cedexis Fusion.
For example, the latency, throughput,
and availability data provided by Radar would
obviously be considered. Beyond that, if two
CDNs were both delivering acceptable performance, you could choose the cheaper option.
Note that Radar is a free service; you only
start to pay once you use OpenMix. In March,
Cedexis added video QoE tracking to Radar.
According to Jones, Cedexis will track start
time, failure rate, rebuffer ratio, and bitrate
via a simple beacon that should easily integrate into any HTML5 player, but won’t be available for mobile or OTT devices for the foreseeable future.