This web page helps you to convert video to four-side hologram video. The figure below illustrates the layout of the output video. In the output video, the padding part will be pure black as well as the background. If you'd like to put your phone/tablet below hologram pyramid, check the "screen up" box.

Please enter the length (0 < length ≤ 5000):
Please enter d (0 < d < length/2):
Please enter padding (make sure there's space left for video):
Screen up?

File with extension listed on wikipedia is allowed, but I cannot gurantee that the conversion always works for all video types. You can always run the codes locally and play with the codec. File size limit = 100M.

Download will automatically start when conversion is done.