Music Video Redundancy and Half-Life in YouTube

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1 Old Dominion University ODU Digital Commons Computer Science Presentations Computer Science Music Video Redundancy and Half-Life in YouTube Matthias Prellwitz Michael L. Nelson Old Dominion University, Follow this and additional works at: computerscience_presentations Part of the Archival Science Commons Recommended Citation Prellwitz, Matthias and Nelson, Michael L., "" (2011). Computer Science Presentations. Book This Book is brought to you for free and open access by the Computer Science at ODU Digital Commons. It has been accepted for inclusion in Computer Science Presentations by an authorized administrator of ODU Digital Commons. For more information, please contact

2 Music Video Redundancy and Half-Life in YouTube Matthias Prellwitz and Michael L. Nelson Berlin, Germany

3 Linking to a particular copy Rolling Stones - Satisfaction Matthias Prellwitz and Michael L. Nelson 2

4 Metadata lost when YouTube video disappears video title url The Rolling Stones Satisfaction Matthias Prellwitz and Michael L. Nelson 3

5 Metadata hard to recover from Search Engines Matthias Prellwitz and Michael L. Nelson 4

6 But nearly 300 copies remain in YouTube Matthias Prellwitz and Michael L. Nelson 5

7 Linking music-related URIs Transparent URI semantics Opaque URI semantics Matthias Prellwitz and Michael L. Nelson 6

8 Popular Music US Top 40 Singles Charts of 9/25/10 Matthias Prellwitz and Michael L. Nelson 7

9 Popular Music Selected Music Blogs Matthias Prellwitz and Michael L. Nelson 8

10 Popular Music The 500 Greatest Songs of all Time Matthias Prellwitz and Michael L. Nelson 9

11 Total Result Size Range US Top 40 Singles Charts of 9/25/10 123,239 83,298 43,945 Lady Gaga Alejandro Selena Gomez & The Scene A Year Without Rain Matthias Prellwitz and Michael L. Nelson 10

12 Total Result Size Range Selected Music Blogs 264, , ,936 Lady Gaga Bad Romance Mariah Carey featuring Juelz Santana & Bone Thugs-n-Harmony Don't Forget About Us Matthias Prellwitz and Michael L. Nelson 11

13 Total Result Size Range The 500 Greatest Songs of all Time 174, , ,076 Michael Jackson Billie Jean The Isley Brothers That Lady (Part 1 and 2) Matthias Prellwitz and Michael L. Nelson 12

14 URI Unavailability Rooted from a selected collection Matthias Prellwitz and Michael L. Nelson 13

15 URI Unavailability Expected Half-life Matthias Prellwitz and Michael L. Nelson 14

16 URI Publication and Removal Rate Matthias Prellwitz and Michael L. Nelson 15

17 Lifetimes of unavailable videos Years Month Matthias Prellwitz and Michael L. Nelson 16

18 Reasons for no unavailable videos Matthias Prellwitz and Michael L. Nelson 17

19 When a YouTube video disappears video title The Rolling Stones - Satisfaction url Published :44 Removed (300 days online) HTTP/ Not FoundContent-Type: text/html; charset=utf-8 Matthias Prellwitz and Michael L. Nelson 18

20 Metadata purged from YouTube Databases Video feed curl -I " HTTP/ Not Found Content-Type: text/html; charset=utf-8 Private video Related videos curl -I " HTTP/ Not Found Content-Type: text/html; charset=utf-8 Parent Video not found Video comments curl -I " HTTP/ OK Content-Type: application/atom+xml; charset=utf- 8 Matthias Prellwitz and Michael L. Nelson 19

21 Metadata Normalization Dereferencing ASIN via amazon.com Webservice: Artist: Michael Jackson Title: Billie Jean (Single Version) Matthias Prellwitz and Michael L. Nelson 20

22 Availability of music-related metadata parsed out only at the first time a URI showed up in the result list for the first time YouTube crawling restrictions Remaining portion query video title against music related services via search engines Google/Yahoo! with site parameter Matthias Prellwitz and Michael L. Nelson 21

23 Retrieving and preserving a video s metadata Active preservation attempt once a video copy is available Parse HTML out for structured music-related metadata YouTube generated meta data AmazonMP3 affiliate link search engines with free-form video title against music-related websites Preserving metadata into the public web infrastructure Matthias Prellwitz and Michael L. Nelson 22

24 Preservation Prototype Matthias Prellwitz and Michael L. Nelson 23

25 Metadata preservation Example: twitter Matthias Prellwitz and Michael L. Nelson 24

26 Pointing to a Resolver service v=214szpqbuyc/ Author-side approach content creator points directly to a resolver service Server-side approach Plugin/Renderer class automatically rewrites YouTube video watch URIs to resolver service Client-side approach Web-Browser plugin intercepts click on Youtube video watch URIs and redirects to resolver service Matthias Prellwitz and Michael L. Nelson 25

27 YouTube Resolver service HTTP/ Not Found search for preserved metadata in list of designated accounts HTTP Status Code HTTP/ OK HTTP/ See Others * redirect exact best available granularity query YouTube API with those Provided (and evaluate) alternative copies *) Matthias Prellwitz and Michael L. Nelson 26

28 Future Work Evaluation of preservation and retrieval quality of chosen services exchange services additional automation of preservation process once YT URI was passed for resolving Evaluation of retrieved available copies redirect to best copy instead of returning a list to choose Consider international requesters taking requester s location (country) into account Matthias Prellwitz and Michael L. Nelson 27

29 Summary Pointing to a specific YouTube video copy by its URI has a risk of disappearance alternative copies over time available YouTube URIs unlikely to be cached once gone YouTube metadata only reliable for available URIs active preservation attempt Introducing a level of indirection: Resolver service check URI status and location header search the public web for injected metadata query for alternative copies Matthias Prellwitz and Michael L. Nelson 28

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