Video quality in next generation mobile networks &amp;#x2014; Perception of time-varying transmission

Lewcio, Blazej; Belmudez, Benjamin; Mehmood, Amir; Wältermann, Marcel; Möller, Sebastian

doi:10.1109/cqr.2011.5996089

Cited by 44 publications

(39 citation statements)

References 16 publications

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“…Taking the aforementioned settings for quality oscillation scenarios into account, no significant effect of switching frequency on perceptual quality was observed (RQ2). This finding contradicts the statement that video quality switching is a degradation itself [4], but on the other hand it confirms the result of [16]. Thus, adaptation intervals do not have to be considered in the first place when seeking an appropriate chunk length for a HAS system.…”

Section: Discussioncontrasting

confidence: 55%

“…Influence of the adaptation related parameters on viewers' perceptual quality have been already shown by previous studies. The study presenteded in [4] claims that "quality switches are perceived as a degradation itself". However, quality switches are often inevitable due to changing bandwidth conditions.…”

Section: Related Workmentioning

confidence: 99%

“…Ref in Table II). Finally, the sixth and seventh characters express the quality at the beginning and the end of the sequence in order(ranging from [1][2][3][4][5] depending on the levels available in the adaptation set as depicted in Table II column Level).…”

Section: A Test Materials and Conditionsmentioning

confidence: 99%

“…For the comparison of high and low frequent switching strategies, the quality was oscillated between Q i and Q i+k as starting quality level [1][2][3][4][5] ending quality level [1][2][3][4][5] Fig. 2: Description of the code structure for identifying characteristics of the adaptation test condition.…”

Section: A Test Materials and Conditionsmentioning

confidence: 99%

See 3 more Smart Citations

Perceptual Quality of HTTP Adaptive Streaming Strategies: Cross-Experimental Analysis of Multi-Laboratory and Crowdsourced Subjective Studies

Tavakoli

Egger

Seufert

et al. 2016

IEEE J. Select. Areas Commun.

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Abstract-Today's packet-switched networks are subject to bandwidth fluctuations that cause for degradation of user experience of multimedia services. In order to cope with this problem, HTTP Adaptive Streaming (HAS) has been proposed in recent years as a video delivery solution for the future Internet and being adopted by an increasing number of streaming services such as Netflix and Youtube. HAS enables service providers to improve users' Quality of Experience (QoE) and network resource utilization by adapting the quality of the video stream to the current network conditions. However, the resulting timevarying video quality caused by adaptation introduces a new type of impairment and thus novel QoE research challenges. Despite of various recent attempts to investigate these challenges, many fundamental questions regarding HAS perceptual performance are still open. In this paper, the QoE impact of different technical adaptation parameters including chunk length, switching amplitude, switching frequency and temporal recency are investigated. In addition, the influence of content on perceptual quality of these parameters is analyzed. To this end, a large number of adaptation scenarios have been subjectively evaluated in four laboratory experiments and one crowdsourcing study. Statistical analysis of the combined dataset reveals results that partly contradict widely held assumptions and provide novel insights in perceptual quality of adapted video sequences, e.g. interaction effects between quality switching direction (up/down) and switching strategy (smooth/abrupt). The large variety of experimental configurations across different studies ensures the consistency and external validity of the presented results that can be utilized for enhancing the perceptual performance of adaptive streaming services.

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Section: Discussioncontrasting

confidence: 55%

Section: Related Workmentioning

confidence: 99%

Section: A Test Materials and Conditionsmentioning

confidence: 99%

Section: A Test Materials and Conditionsmentioning

confidence: 99%

See 2 more Smart Citations

Perceptual Quality of HTTP Adaptive Streaming Strategies: Cross-Experimental Analysis of Multi-Laboratory and Crowdsourced Subjective Studies

Tavakoli

Egger

Seufert

et al. 2016

IEEE J. Select. Areas Commun.

View full text Add to dashboard Cite

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“…The incorporation of the effects of frame rate and resolution adaptations on the user perception to obtain the encoding configuration that maximizes the QoE for a certain type of content has been investigated in [7]. The study presented in [23] particularly compared the difference of the impact of increase and decrease of quality in response to a variation in the network condition. It is reported that downgrading the quality has a stronger impact on the QoE.…”

Section: Related Workmentioning

confidence: 99%

On subjective quality assessment of adaptive video streaming via crowdsourcing and laboratory based experiments

Sogaard

Shahid

Pokhrel

et al. 2016

Multimed Tools Appl

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Video streaming services are offered over the Internet and since the service providers do not have full control over the network conditions all the way to the end user, streaming technologies have been developed to maintain the quality of service in these varying network conditions i.e. so called adaptive video streaming. In order to cater for users' Quality of Experience (QoE) requirements, HTTP based adaptive streaming solutions of video services have become popular. However, the keys to ensure the users a good QoE with this technology is still not completely understood. User QoE feedback is therefore instrumental in improving this understanding. Controlled laboratory based perceptual quality experiments that involve a panel of human viewers are considered to be the most valid method of the assessment of QoE. Besides laboratory based subjective experiments, crowdsourcing based subjective assessment of video quality is gaining popularity as an alternative

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Experience of Wireless Telephony

Lewcio

2013

T-Labs Series in Telecommunication Services

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Video quality in next generation mobile networks — Perception of time-varying transmission

Cited by 44 publications

References 16 publications

Perceptual Quality of HTTP Adaptive Streaming Strategies: Cross-Experimental Analysis of Multi-Laboratory and Crowdsourced Subjective Studies

Perceptual Quality of HTTP Adaptive Streaming Strategies: Cross-Experimental Analysis of Multi-Laboratory and Crowdsourced Subjective Studies

On subjective quality assessment of adaptive video streaming via crowdsourcing and laboratory based experiments

Experience of Wireless Telephony

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