7/3/2023 0 Comments Nicecast keeps rebufferingThis then becomes a trade-off between quality and buffering, between player and encoding. Maybe the bandwidth is just above the average bitrate of the video, so the player chooses the highest quality, which is perhaps not optimal given its VBR and sudden bursts of action. Commonly there is a fault in the Adaptive Streaming strategy, where the player can be over-aggressive in its choice of quality. Going up one last rung we can investigate the player. This means when the action suddenly heats up, we’re likely to see buffering. However, because H.264 and other codecs encode at a Variable Bitrate (VBR) - where the video is encoded with a low bitrate at still moments, and high bitrate durings fast action - the average bitrate described in the manifest may not accommodate enough bandwidth for the video to play smoothly. With encoding, ideally our manifest is going to dictate the correct bitrate for video encoding. If it’s not the ISP or the CDN, then the problem may be the encoding process or the player itself. Moving up the ladder another rung, we’ve come to issues the publisher can control more directly. From here, we can decide to compare between different CDN providers and see if we can improve our video delivery. If rebuffering is high in particular countries, this might mean that your CDN provider is struggling in delivering video from your source, to that country. This can let us know if it's a specific service provider, or a certain region that is experiencing rebuffering issues.Ī CDN is used to cache content close to users, but most CDNs don’t do this as well across larger distances. If we think it was the ISPs fault, we can use Mux’s ASN filters to look into which ISPs are causing the biggest problems for our video. However if you leave the matter there, you would never improve your video pipeline. The most common culprits of Rebuffering issues are usually: the Internet Service Provider, the Content Delivery Network, Encoding Processes and the Player itself, in that order.Īssuming you have done everything correctly and it's clear sailing on a perfect day, then yes, it probably was the ISP’s fault there was buffering. Link42IconTroubleshooting Possible Causes of Rebuffering Then like all buffering metrics, we can try to investigate what is a trend and what is an anomaly. We can really delve deep into just how bad the experience is for our worst-hit viewers. This is also a great metric to scrutinise by Country, Browser, and Device. This allows us to look at that bottom 5% of viewers who are not having a great experience. However, this is a great metric to look at the 95th Percentile. As Internet Service Providers have improved, the video actually stopping to rebuffer once it’s loaded has become a less frequent occurrence. This metric can look pretty binary at first glance. ![]() ![]() To put that another way, it’s the percentage of the video a viewer tried to watch video, but was unable to. The Rebuffering Percentage reflects the amount of time video spent rebuffering, as a percentage of the total time video was requested. While the Rebuffer Score can give you a brief overview of whether buffering is currently a problem or not, the individual metrics we’re going to go over in this post can reveal more precise details. Link42IconMux’s Rebuffering MetricsĪt Mux we have four different rebuffering metrics along with our overall rebuffering score. When a consensus on terms is finally reached, we will let you know, bur for now we are sticking to Rebuferring. Other people may also call this Video “Stall” or “Stalling”. We call this “Rebuffering” to distinguish it from “Buffering” which can include other things. In this article we will be focusing on the issue where: a viewer has been receiving video playback, but it then stops, and the video has to “catch up”. In either case, the blame can sway between the Internet Service Provider, the Content Delivery Network, or the original Publisher.īefore we dive further into this subject, let’s review some terminology regarding Buffering. But, now that Adaptive Streaming has come to dominate online video, it’s become a little more complicated. In the days of Progressive Video, rebuffering was caused by there not being enough bandwidth for the video to be loaded. That little rolling wheel is the symbol for a bad viewer experience. ![]() Rebuffering is the most noticeable and most annoying fault for a viewer to experience.
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