When I click to link to a video clip, Acrobat Pro DC asks my permission since it might harm my PC, and it gives me a box to check to say 'No, don't ask me again'. Also, I can go to Edit > Preferences and say 'Always' grant permission for whichever available players are listed. That solves a serious problem for me since my PDFs have over 100 little video clips in them, and readers will hate having to give permission again and again and again. Unfortunately these capabilities exist only in Acrobat, not in Reader. When I click to open a file in Reader, the permission window does not have a 'Do not ask me again' box, so my readers will see this warning 100+ times. Also Reader has the same Edit > Preferences choices as in Acrobat, but THEY DON'T WORK. I can say 'Always', but it still asks me again and again and again. This may seem like a rare problem, but all the code is already written in Acrobat, and it should be fairly easy to move it into Reader, no? The first two video files in the PDF are attached below. They are linked to the icons on page 6 and 7. But they go through an intermediate folder named _Examples in the book itself. So to test it you would have to put them in a folder with that name, or just re-link them.
(I know MOV files are deprecated for security reasons, but they are extremely important for this application for two reasons: 1. Readers are linguists who will want to study the videos one frame at a time and apparently only Quicktime has this ability; and 2. The videos are all short - just one sentence each in deaf sign language - and other video players that I have investigated all end with a black screen instead of leaving the last frame visible. This effectively wipes from the reader's memory everything he has just seen. The purpose is for the reader to analyze what he has seen and the black screen will leave leave his mind blank mind as soon as he sees it.)
If there is any way you could let me know if this requested improvement is given some priority, I would very much appreciate it. And I will be happy to work with your team in any way I can. You can also feel free to remote to my computer and see what I'm taking about.
-Peyton Todd