I have been using Jacksta Media Recorder for a long time now, and it has always worked marvelously for me when I need to download a video. Jaksta can download nearly any online video that I can watch in Safari.
But recently, Jaksta does download the exact videos I want, but the downloads turn out to be .mp4 files that QuickTime hangs on when trying to play them…
What can I do ?
The exact reason for this is unknown, but it might have something to do with the fact that not all browsers play HTML5-videos using the same technology.
It turns out that your solution is to use the Google Chrome (or Firefox) web browser – instead of Safari – with Jaksta running in the background. That way, when you play the online video in Chrome (or Firefox), the file that Jaksta downloads will be a .mp4 video that QuickTime can play without any problems.
That’s it !