Meaning of the mantra "Om Mani Padme Hum"

如得法师 gives his explanation of what Om Mani Padme Hum means in this video:
(starting from 2:57 mark)

I think his explanation is aligned with the wikipedia entry (the section "The 14th Dalai Lama says)

The rest of the video is good advice but getting the explanation from a Venerable is a unexpected return

The mantra is also called 六字大明咒 in Chinese.

Sharing a musical piece of the mantra that I find soothing:

My 班长 shared this video in class.

The meaning of Om Mani Padme Hung by His Holiness the Dalai Lama