Video traffic is going to be, if not already, the dominant constituent of the global Internet traffic. It was reported a few months back that traffic from Netflix alone constituted about 20% of the US Internet traffic. In this article, we want to discuss the performance various aspects of video lotions, video on-demand or video streaming to residences in particular. Other applications such as video conferencing and video register download are good topics for future discussions.
YouTube and Netflix movie on-demand are good examples of VOD or streaming video assistances. The videos are watched on many devices like PCs/ laptops, tablets, smartphones, and smart TVs( or TVs furnished with an external streaming device such as Google TV or Roku ).
Video streaming, contrary to the popular expectation, uses the TCP/ IP not the UDP/ IP etiquette. That means the video/ audio flakes are extradited error-free and in exact cycle( entails no communication degradation in transit ). If one is watching a 10 -minute video clip, the initial containers that are delivered are buffered for a short extent of occasion( reply 30 seconds) and the playing of the video is delayed by that extent. Once the video starts playing, the remaining packets of the video clip are gave endlessly in the background and will continue replenishing the screen. Thus the expose of the video is likely to be smooth after the initial interval holding the effect of nearly is available on real-time. Well, let us say most of the time, acquiring the network bandwidth and excellence are fully adequate.
Many times, the network excellence may not be up to equivalence. The bandwidth may diversify and get increased during the playing or there may be container losses. When the network behaves such, there may not be brand-new chips available for exposure as they are still arriving slowly or in the process of being retransmitted. A interrupt status/ icon( informing “still loading”) will be shown on the screen till fresh flakes become available to be displayed. This pausing may happen for a very short period if the connection is randomly degraded for a very brief extent of an hour. If this position happens once or twice it is dependent on the total duration of the video creek( say more than 5 minutes ), then there is no impact on the user experience.
On the other hand, if one is watching a one-hour video and the network alliance is frequently gradual or of bad quality, then there will be numerous glitches during that hour and it is not amusing to watch such a video -the user experience takes a definite hit.
I knew this phenomenon myself lately. I watch aged Tv scenes on Netflix regularly between 9 pm to 11 pm. I never had any user knowledge publications for the first six-months of this year – excellent rendition. Lately, however, the video delays not once but several times – I had to roughly throw overboard watching these displays. These substantiates are about 45 -minutes long and the full amounts of the file sizes are about 700 Gbytes. My Internet services are currently provided by Comcast via the cable modem. I generally get download accelerations in the range of 4 Mb/ s to 10 Mb/ s.
Unlike fiber to home, Internet delivered via cable is still shared by many dwellings in the community. The available bandwidth might descend to the lower end of the straddle during the prime time or hours of ponderous Internet usage. There may be container loss because of contention. The investigation as to why there is so much stuttering of the video at that time is still inconclusive and requires further study.
Another thing to note here is that in the Application Performance Management( APM) nature we have the response time metric for assessing the performance of an interactive App. But for VOD, we know what a bad customer know is but we don’t have a standard path of measuring the subscribers know. This metric should incorporate points such as the initial extent of delay and the number of suspensions( and their duration) encountered during the video delivery.