Here is a link to a Fifth Estate program that aired last evening - it gives a very fair (imo) look at all aspects of the use of videos in such cases - be it body/dash cams or bystander video. The last segment, beginning at the 30 minute mark (of 45 minutes) is about the Scott shooting.
http://www.cbc.ca/fifth/episodes/2016-2017/police-shootings-caught-on-camera
The segment centers on a documentary by a Toronto filmmaker titled 'Frame 394' - it has just been short listed for an Oscar. Maybe this doc has been posted already - not sure.
The filmmaker has enhanced and slowed down the video - the view is very good. The filmmaker also gives his perspective on the shooting, however I don't really see his point of view, nor do I understand why he changed his mind after viewing the video with more clarity. At the 39+ minute mark, the lawyer for Slager states (while speaking to his client) ' ... we want your video to be the best it can be ...'
However the defense now wants the video excluded altogether.
Caution - there are as many ads in this viewing as there are watching cable TV.
Thank you for linking us to that Fifth Estate program. I also came away from the Fifth Estate viewing not understanding the abrupt shift in opinion or the significance of frame 394.
So, I found this YouTube of the full "Frame 394" video. Much of it was actually shown in the Fifth Estate program.
Frame 394: Toronto Man Entangles Himself In Police-Involved Shooting | Oscar for Documentary Short
https://m.youtube.com/watch?v=GZSb00oSzuY&feature=youtu.be
I think Daniel Voshart first thought he saw the Officer Slager throwing or flinging the taser backwards. Further manipulations of the video caused him to believe that it was actually Walter Scott flinging the taser towards Slager with Slager not realizing that Scott had released the taser. Therefore, Voshart decided that Slager was justified in shooting Scott in the back as he was running away because Slager thought Scott had the taser.
With that said, I can think of at least one fact from the original film that doesn't necessarily back that theory up.
Anyhow, I now somewhat understand a little incident that occurred in court on Friday. Andy Savage was cross examining Saldana and attempted to show him a still shot from what he said was Saldana's video. Scarlett Wilson, the prosecutor, wondered from which film the still shot came? I didn't understand that, now I do. The still shot seemingly came out of nowhere, had not been previously shown or talked about, etc. The judge ruled that without more information the photo could not be shown to either Saldana (or the jury).
So, my guess is that the still shot was of frame 394 in the enhanced video in the possession of Andy Savage.
I am also thinking there is something a little too convenient about the making of "Frame 394".