The laws of each state vary and everything would depend on the specific facts of the case. However, genreally, once a defendant has been convicted, in order to set aside the conviction based on new evidence, the defendant is required to make a motion to set aside the conviction upon the grounds of newly discovered evidence. Assuming the prosecutor doesn't stipulate to the relief requested (and most do not for various reasons, many of which are actually justified), the court thereafter schedules oral argument and (possibly) an evidentiary hearing. That argument and hearing would look at various issues including, but not limited to, authentication of the new evidence and the likelihood of whether the evidence would have resulted in a different verdict if presented at the trial. Assuming the court rules in favor of the defendant, and depending on the nature of the ruling, it may order the conviction set aside with prejudice or it might order a new trial. Of course, all of that would also be subject to appellate review at the request of the losing party.Ok, I understand the file was only recently recovered. But then shouldn't he have been released from prison as soon as the video was available? Was it necessary to do a new trial? Do they have to do it every time unequivocal proof of the innocence of someone wrongly convicted turns up?
In other words: Maybe, maybe not