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The first 34 minutes of the tapes were erased, and it is unknown if they contained footage of the assassination. There are four video recordings of the assassination, but three disappeared in 1981 after a failed attempt to authenticate them. None have been definitively authenticated as being shot by Abraham Zapruder due to their lack of provenance. Footage may have been shot by a second amateur, positioned closer to the president. That person was Wiegman, who was positioned behind the picket fence on the grassy knoll. Except for a brief clip shown in Oliver Stone's 1991 film "JFK", most of Wiegman's footage is still lost. The authenticity of the recording shot by Zapruder is controversial. While it is generally accepted that Zapruder took pictures during the assassination, there are still doubts about whether he kept filming after frame 313, where Zapruder said he stopped filming due to being overcome with shock. Many researchers feel the other camera angles do not show enough of Dealey Plaza to determine what happened, but frame 312 appears to show the president's head exploding, which would be consistent with the shot having come from the sniper's nest. The Zapruder film was shown in its entirety for the first time on television during "The JFK Assassination" episode of ABC News "20/20" on March 6, 1975. Frame-by-frame analysis has been conducted by various authorities over several decades since the Assassination. It was famously analyzed in the 1991 Oliver Stone film, "JFK". Although the film is the best known recording of the assassination, it is not useful for placing anyone in particular at the scene of the crime. The Zapruder film establishes that several shots were fired and that they came from behind and to the right of President Kennedy. A later recording by Dallas dressmaker Abraham Zapruder captured the 26 seconds leading up to, during and immediately following the assassination. Zapruder's film shows the motorcade turning onto Main Street near the Dallas County Records Building at 12:30 p.m. and traveling uptown for a few minutes. It then shows, in slow-motion, the assassination of the president three seconds later from behind and to the right of his limousine. The film shows one or two shots being fired by the sniper, with the gunman seemingly working his way toward Zapruder on a perch on top of a building overlooking Dealey Plaza. The Zapruder film was seized by Robert Groden in 1968 and provided to "USA Today" along with analysis by him and others in 1979–1980. cfa1e77820