In our experiments, we tested the network connection bandwidth
between the Amazon EC2 instances and the YouTube
website, and found that video downloading from YouTube website
to the instances is very fast.
Therefore, the startup latency
depends mainly on the burst interval setting and the transcoding
speed at the VM surrogate.
Fig. 10 shows that in general, the
longer the burst interval is, the larger the segment of video to
transcode is, and thus the longer the startup latency is.