This scene is from Star Trek II - The Wrath of Khan. The supporting character Spock has died and is to be given a 'sendoff' ceremony. It is interesting to note that this is a portrayal of the future of death, as the scene is set in the year 2364. In this science fiction setting the human race is a space faring one, and part of an intergalactic government with its own customs and attitudes towards death. 

In the video the body is inside a casket draped in a flag similar to a present-day military style funeral. However, the casket itself is the casing for a torpedo with the body inside it, instead of an active warhead. The casket is lowered into a conveyer belt in which members of the crew pay their final respects and the captain of the ship sounds an order for the body to be jettisoned into space to rest. 'Amazing grace' is then played on bagpipes as the casket is lowered into the launch bay and fired out into space leaving a bright streak. 

This portrays a tamed form of approaching death. As a member of a crew in a militarized organization, death is always looming and members are always ready and charged to lay down their lives for duty. Thus death is part of life and the members of the crew know how to ritualize death. The dead are sent into space, almost as if the body is reclaimed by the cosmos to finally rest in the vastness and emptiness of space.