Here we catalog, visually demonstrate, and discuss the main causes of commonly encountered visual distortions into current 360-degree video processing pipelines. The main goal of the samples in this dataset is to demonstrate the visual distortions discussed in the paper: Azevedo, Roberto G. de A.; Birbeck, N.; De Simone, F.; Janatra, I.; Adsumilli, B.; Frossard, P. (2019) Visual distortions in 360-degree videos. IEEE Transactions on Circuits and Systems for Video Technologies (TCSVT). https://infoscience.epfl.ch/record/262698 Since 360-degree videos are intended to be consumed on head-mounted displays (HMDs) the viewer will only have a full appreciation of the distortion by using them. We provide the full source content so that the viewers can also download and check the images/videos using a HMD.