NDLI: Effective content-based video caching with cache-friendly encoding and media-aware chunking

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Effective content-based video caching with cache-friendly encoding and media-aware chunking

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Effective content-based video caching with cache-friendly encoding and media-aware chunking

Content Provider	ACM Digital Library
Author	Nam, Giyoung Bae, Sangwook Park, KyoungSoo
Abstract	Caching similar videos transparently in a network is a cost-effective solution that potentially reduces redundant data transfers. Recent study shows that network redundancy elimination (NRE) on the content level could produce high bandwidth savings in ISPs. However, we find that blindly employing existing NRE techniques to video contents could lead to suboptimal redundancy suppression rates. This is because (a) randomness in the video encoding process could produce completely different binaries even when they deal with seemingly identical video clips and (b) existing NRE chunking schemes incur high overheads since they do not utilize the underlying video format. In this work, we present two novel schemes that help similar or aliased videos to be cached more effectively in the NRE system. First, we propose a deterministic video encoding scheme that preserves the unmodified original content even after editing or re-encoding. This would eliminate the sources of encoding randomness, allowing the NRE systems to detect the redundancy across similar videos. Second, we propose a lightweight video chunking scheme that exploits the underlying video structure. Our "sample-based" chunking scheme groups the logically-related frames into a chunk, and significantly reduces the size of NRE chunk indexes as well as chunking overheads. Our preliminary evaluation shows that the deterministic video encoding scheme helps greatly expose the redundancy across similar videos even after editing. Also, our sample-based chunking reduces the chunking overhead by a factor of 2.0 to 22.5 compared with popular NRE chunking schemes and reduces the index size by 27 times over various video contents.
Starting Page	203
Ending Page	212
Page Count	10
File Format	PDF
ISBN	9781450327053
DOI	10.1145/2557642.2557657
Language	English
Publisher	Association for Computing Machinery (ACM)
Publisher Date	2014-03-19
Publisher Place	New York
Access Restriction	Subscribed
Subject Keyword	Caching Network redundancy eliminination Video encoding
Content Type	Text
Resource Type	Article

Sl.	Authority	Responsibilities	Communication Details
1	Ministry of Education (GoI), Department of Higher Education	Sanctioning Authority	https://www.education.gov.in/ict-initiatives
2	Indian Institute of Technology Kharagpur	Host Institute of the Project: The host institute of the project is responsible for providing infrastructure support and hosting the project	https://www.iitkgp.ac.in
3	National Digital Library of India Office, Indian Institute of Technology Kharagpur	The administrative and infrastructural headquarters of the project	Dr. B. Sutradhar bsutra@ndl.gov.in
4	Project PI / Joint PI	Principal Investigator and Joint Principal Investigators of the project	Dr. B. Sutradhar bsutra@ndl.gov.in Prof. Saswat Chakrabarti will be added soon
5	Website/Portal (Helpdesk)	Queries regarding NDLI and its services	support@ndl.gov.in
6	Contents and Copyright Issues	Queries related to content curation and copyright issues	content@ndl.gov.in
7	National Digital Library of India Club (NDLI Club)	Queries related to NDLI Club formation, support, user awareness program, seminar/symposium, collaboration, social media, promotion, and outreach	clubsupport@ndl.gov.in
8	Digital Preservation Centre (DPC)	Assistance with digitizing and archiving copyright-free printed books	dpc@ndl.gov.in
9	IDR Setup or Support	Queries related to establishment and support of Institutional Digital Repository (IDR) and IDR workshops	idr@ndl.gov.in

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