Simple helix server down3/11/2023 AAC audio uses the concept of access units or packets, and one access unit contains 1024 samples. For video we use frames which typically is 25 frames per second (in Europe). The length in which units of video and audio are counted is different. Ensure that video and audio packets have the same length Make sure to check with your CDN provider(s) that they support HTTP/2 and have it enabled on your account. Note that HTTP/1.1 with pipelining has a similar performance advantage, except that many browsers disable this functionality.Ĭomparing MPEG-DASH throughput performance of HTTP/1.0 with HTTP/2 (SPDY SSL). Their test shows that HTTP/2 can sustain a higher throughput especially as the latency between the client and the server increases. compares the throughput performance of HTTP/1 and HTTP/2. The below graph from a research paper by Mueller et al. HTTP/2 helps by allowing a connection to be re-used for subsequent requests. Three trends have increased the overhead of these connections, the shift to (i) HTTPS which requires an extra TLS handshake, (ii) delivering video and audio in separate streams (referred to as unmuxed delivery), and (iii) smaller segment sizes (used to be 10 seconds, now 6 seconds or less). HTTP based streaming protocols require a lot of connections for downloading manifests (to know which segments to download) and the segments themselves. ![]() ![]() Deliver over HTTP/2 to reduce the connection overhead If a segment is 6 seconds long, and the player buffers 3 segments this will introduce a delay of 18 seconds. In order to ensure smooth playback the player will buffer a couple of segments. HTTP streaming protocols cut up the stream into segments, which are files that can be transported over HTTP like any other file. HTTP streaming protocols can use standard HTTP infrastructure which makes it much more straightforward to build and maintain the distribution infrastructure (you can use a standard web server such as Apache or Nginx). What are HTTP based streaming protocols and why is there a delay?īefore HTTP streaming there were other protocols such as RTSP and RTMP which had the downside of requiring dedicated infrastructure to distribute (remember the Flash Media Server, or RealNetworks’ Helix Server?).
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