labmeeting - 20151013 - adaptive video streaming over http with dynamic resource estimation

NTUST - Mobilizing Information Technology Lab

Adaptive Video Streaming over HTTP with Dynamic Resource Estimation

Truong Cong Thang Univ. of Aizu, Aizu-Wakamatsu, JapanLe, H.T. ; Nguyen, H.X. ; Pham, A.T. ; Jung Won Kang ; Yong Man RoJournal of Communications and Networks, Vol. 15, No. 6, Dec. 2013

Advisor： Jenq-Shiou LeuStudent： Bing-Syuan WangDate： 2015/10/13National Taiwan University of Science and Technology

NTUST - Mobilizing Information Technology Lab 2

Outline• Introduction• Overview of Adaptive HTTP Streaming• Throughput Estimation• Experiments• Video Bitrate Estimation• Experiments• Conclusion


Introduction• Hypertext transfer protocol (HTTP) streaming has become a cost effective

means for multimedia delivery.

• Client-based approach.

• Bandwidth estimation. Bitrate estimation.

• Constant bitrate (CBR) video/Variable bitrate (VBR) video.• This solution may enable CBR-streaming even though the video is encoded in

VBR mode


Overview of Adaptive HTTP Streaming• Dynamic adaptive streaming over HTTP (DASH)• Metadata: media presentation description (MPD)


Throughput Estimation• Based on previous segment throughputs / last segment (aggressive method).


Throughput Estimation• : The estimated download throughput• : The estimated download duration


Experiments• Segment duration 6s; target buffer level 12s.• Client behavior with segment duration of 6 s and throughput estimation using:

(a) Aggressive method and (b) proposed method.

11.5s6s


Experiments• Comparison of the aggressive method and proposed method with segment

duration of 6 s using: (a) CDF of bitrate and (b) CDF of buffer level.


Video Bitrate Estimation• The bitrate is not constant.• The client will be able to dynamically select the highest possible bitrate.• Quantization parameter (QP)

(1-unit QP → 12%)

• A. Inter-Stream Bitrate Estimation

• B. Intra-Stream Bitrate Estimation


Experiments• Segment duration 2s; target buffer level 4s.• Preparing the video alternatives in VBR mode.


Experiments• Based on average bitrate (ABR), highest bitrate (HBR), estimated bitrate

(EBR)


Conclusion• The proposed method can capture quickly the changes of throughput, and

then adjust video bitrate accordingly.

• The estimation methods essentially do not affect the playback quality (less than 1 ms).

• The proposed solutions were effective to maintain a stable buffer under fluctuations of bandwidth and video bitrate.

labmeeting - 20151013 - adaptive video streaming over http with dynamic resource estimation

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