When you import the file onto your computer, it is just a 120fps video file - it doesn't know when or where to convert it to 30fps, which is why it appears as if it "lost" the slomo when really it's playing in its native 120fps. So, when you playback a video the iPhone is converting the selected section of the 120fps video into 30fps, giving it the slow motion effect - the whole video COULD be watched at a normal speed with no problem. This is significant because if you were to playback that video at 30 fps, the videos would appear to be playing in smooth slow motion because there is 4 times the frames to display. Rather, it's shot at 120 frames per second, a typically higher frame rate than normal video recording. The video itself isn't shot in "slomo", so to speak. The reason importing it directly onto your computer doesn't appear to work is due to the way the iPhone plays back slomo videos.
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