The "8" identifies it as part of the 8th group of videos for that specific action.
If you are looking for the architectures that made these videos famous in AI research, you should also look at:
The "vin" prefix typically refers to the Playing Violin action category. vin8.mp4
(Tran et al., 2015) – Often referred to as the C3D paper, which set a standard for using UCF101 samples like vin8.mp4 for feature learning.
This video is frequently cited in papers developing 3D Convolutional Neural Networks (3D CNNs) and Two-Stream Networks for identifying human movements. Other Notable Papers Using This Data The "8" identifies it as part of the
UCF101: A Dataset of 101 Human Action Classes From Videos in the Wild
The seminal paper associated with this dataset and its corresponding video files is: This video is frequently cited in papers developing
(Simonyan & Zisserman, 2014) – This paper introduced the concept of using both spatial (RGB) and temporal (optical flow) streams.