YouTube 8-M

As part of its effort to accelerate the research of temporal concept localization, Google released the YouTube-8M Segment; a new extension of the original YouTube-8M dataset that includes human-verified labels at the 5-second segment level on a subset of YouTube-8M videos. With the additional temporal annotations, this is now a very good large-scale classification as well as temporal localization dataset that can be used to develop more advanced video understanding AI.

https://research.google.com/youtube8m/download.html