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EN
Today’s Internet knows no bounds. New applications are marketed every single day. Many of them incorporate video sequences. These must be transported over the Internet quickly (often in real time). However, the Internet has not been designed for live communications and, regrettably, this may become apparent all too quickly. Countermeasures are required in the form of new, efficient transport techniques facilitating online video services. MPEG-DASH is one of such modern techniques. But how good is this new technique really? This paper delves into the matter. The paper contains an analysis of the impact that the new technology exerts on the quality of video streaming over IP networks. It also describes a new numerical tool – QoSCalc (DASH-HTTP) which has been used to analyze MPEG-DASH under different use scenarios. The results are presented graphically and their interpretation is provided
EN
The paper discusses the problem of video transmission in an IP network. The authors consider the ability of using the most popular video codecs that use both the MPEG2 Transport Stream and Dynamic Adaptive Streaming over Hypertext Transfer Protocol (DASH). The main emphasis was given to ensuring the quality of service and quality assessment methods, taking into account not only the service- or network provider’s point of view but also the end user’s perspective. Two quality assessment approaches were presented, i.e. objective and subjective methods. The authors presented the results of the quality evaluation for H.264/MPEG-4, H.265/HEVC and VP9 codecs.The objective measurements, proved by statistic alanalysis of user opinion scores, confirmed the ability of using H.265 and VP9 codecs in both real time and streaming transmissions, while the quality of video streaming over HTTP with the H.264 codec proved inadequate. The authors also presented a connection between the dynamics of network bandwidth changing and MPEG-DASH mechanism operation and their influence on the quality experienced by users.
PL
Transmisja wideo generuje w Internecie znaczący ruch. Jest ona stosowana zarówno w usługach czasu rzeczywistego jak i w usługach streamingowych, w których czas rzeczywisty nie odgrywa pierwszoplanowej roli. Internet jest zawodną platformą transportową. To może powodować obniżenie jakości usług. Aby wyjść temu naprzeciw, potrzebne są odpowiednio dobrane techniki transportowe dla strumieni wideo. Najczęściej używane są obecnie: MPEG2-TS i MPEG-DASH. Niniejsza praca zawiera wyniki badań oceniających wydajność obu tych technik transportowych w środowisku IP w powiązaniu z najnowszymi kodekami wideo, tj. H.265 i VP9.
EN
Video applications generate considerable traffic in the Internet. The video service is used for both real-time services and streaming services where time does not play primary role. The Internet is an unreliable transport platform. It can cause deterioration in quality of service. Excellently tuned transport techniques are needed to counter this. Currently, MPEG2-TS and MPEG-DASH are two such techniques. This paper contains analysis results that prove the capabilities of both transport techniques when used in conjunction with modern video codecs, namely H.265 and VP9.
4
Content available Video Streaming over IP using the DASH Technique
EN
Modern Internet serves as a high-performance platform for an ever-increasing number of services. Some of them – video services in particular – are of the broadband variety. So, it is not surprising that segments of networks can rapidly become congested, which may lead to a deterioration in quality. It is hoped that the new MPEG-DASH technique will alleviate congestion. This paper contains an analysis of the new technology’s impact on the quality of service in IP networks. It also explains a new numerical tool QoSCalc(DASH) that has been used to analyze the DASH method in different scenarios. The results are presented graphically and interpreted.
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