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, lying in half a ton of minced meat for three days. Kunthaus Tacheles, Berlin.

In the performance, which began on October 12, 1999, Sebastian Bieniek was lying naked for three days in half a ton of minced meat. The performance took place in the unheated rooms of the Kunsthaus Tacheles. The minced meat in which Sebastian Bieniek lay had been delivered frozen by the butcher.

TAZ, german newspaper about "Born To Be Boulette", performance by Sebastian Bieniek (B1EN1EK)

in Kunsthaus Tacheles, Berlin, 1999.

Sebastian Bieniek Performance, 1999, lying in half a ton of minced meat for three days. Kunthaus Tacheles, Berlin.

Sebastian Bieniek Performance, 1999, lying in half a ton of minced meat for three days. Kunthaus Tacheles, Berlin..

Sebastian Bieniek Performance, 1999, lying in half a ton of minced meat for three days. Kunthaus Tacheles, Berlin.

Sebastian Bieniek Performance, 1999, lying in half a ton of minced meat for three days. Kunthaus Tacheles, Berlin.

Sebastian Bieniek Performance, 1999, lying in half a ton of minced meat for three days. Kunthaus Tacheles, Berlin.

Sebastian Bieniek Performance, 1999, lying in half a ton of minced meat for three days. Kunthaus Tacheles, Berlin.

Sebastian Bieniek Performance, 1999, lying in half a ton of minced meat for three days. Kunthaus Tacheles, Berlin.

Sebastian Bieniek Performance, 1999, lying in half a ton of minced meat for three days. Kunthaus Tacheles, Berlin.

Sebastian Bieniek Performance, 1999, lying in half a ton of minced meat for three days. Kunthaus Tacheles, Berlin.