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Using a 34-months long (Aug 2014-Jun 2017) dataset, we show that success rates of streaming a stall-free version of a video over IPv6 have improved over time. We show that a Happy Eyeballs (HE) race during initial TCP connection establishment leads to a strong (more than 97%) preference over IPv6. However, even though clients prefer streaming videos over IPv6, we observe worse performance over IPv6 than over IPv4. We witness consistently higher TCP connection establishment times and startup delays (\u223c100 ms or more) over IPv6. We also observe consistently lower achieved throughput both for audio and video over IPv6. We observe less than 1% stall rates over both address families. Due to lower stall rates, bitrates that can be reliably streamed over both address families are comparable. However, in situations, where a stall does occur, 80% of the samples experience higher stall durations that are at least 1s longer over IPv6 and have not reduced over time. The worse performance over IPv6 is due to the disparity in the availability of Google Global Caches (GGC) over IPv6. The measurements performed in this work using the youtube test and the entire dataset is made available to the measurement community.<\/jats:p>","DOI":"10.1145\/3155055.3155057","type":"journal-article","created":{"date-parts":[[2017,10,26]],"date-time":"2017-10-26T14:19:33Z","timestamp":1509027573000},"page":"2-11","update-policy":"https:\/\/doi.org\/10.1145\/crossmark-policy","source":"Crossref","is-referenced-by-count":13,"title":["Measuring YouTube Content Delivery over IPv6"],"prefix":"10.1145","volume":"47","author":[{"given":"Vaibhav","family":"Bajpai","sequence":"first","affiliation":[{"name":"Technical University of Munich"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Saba","family":"Ahsan","sequence":"additional","affiliation":[{"name":"Aalto University"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"J\u00fcrgen","family":"Sch\u00f6nw\u00e4lder","sequence":"additional","affiliation":[{"name":"Jacobs University Bremen"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"J\u00f6rg","family":"Ott","sequence":"additional","affiliation":[{"name":"Technical University of Munich"}],"role":[{"role":"author","vocabulary":"crossref"}]}],"member":"320","published-online":{"date-parts":[[2017,10,25]]},"reference":[{"key":"e_1_2_1_1_2","doi-asserted-by":"publisher","DOI":"10.1109\/INFCOM.2012.6195644"},{"key":"e_1_2_1_2_2","doi-asserted-by":"publisher","DOI":"10.1145\/1879141.1879197"},{"key":"e_1_2_1_3_2","volume-title":"PAM 2015, New York, NY, USA, March 19-20, 2015, Proceedings. 249\u2013261","author":"Ahsan Saba","year":"2015","unstructured":"Saba Ahsan , Vaibhav Bajpai , J\u00f6rg Ott , and J\u00fcrgen Sch\u00f6nw\u00e4lder . 2015 . 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