What is the difference between "Performance", "Action Art", "Installation Art" and Video Art?

When the artist or the body of the artist is in focus, so the acting is part of the artwork, it's a performance. When the artist isn't visible but it's still about people and when it's that fast changing in time that you can see the "Beginning" and then "End", than it's "Action Art" (Happaning is kind of outsourced - not directed by a single artist but by many). Installation is when you can't see it "changing" in time, so it looks always the same, or can be at least restored, and when it's about objects.

However even still some installations like "My Breath rests here" ("Hier ruht mein Atem") have some performance character (at least in the creation phase), but than again not really, because than "the painting of a painting" could be also a performance, so it's more about the focus.

A recorded and shown as a video performance, without real life viewer and the interaction with the viewer like "The 30 € truth" or "Crying for this Video" for example is a video. (Definition by Bieniek)

Performance: most of the paintings by Sebastian Bieniek that were created until 1998 were in this performance burned.

In 1998 Sebastian Bieniek (Kunsthauses Tacheles in Berlin) burned most of the paintings that he had painted up to then. He wanted to finish painting that way.

Performance: most of the paintings by Sebastian Bieniek that were created until 1998 were in this performance burned.

Performance: most of the paintings by Sebastian Bieniek that were created until 1998 were in this performance burned.

Performance: most of the paintings by Sebastian Bieniek that were created until 1998 were in this performance burned.

Performance: most of the paintings by Sebastian Bieniek that were created until 1998 were in this performance burned.

Performance: most of the paintings by Sebastian Bieniek that were created until 1998 were in this performance burned.

Performance: most of the paintings by Sebastian Bieniek that were created until 1998 were in this performance burned.

The ashes of these paintings were later used to create new artworks: "The Phoenix Paintings", from the "other conceptual art" oeuvre, which is a kind of resurrection oeuvre.