At most, you’re going to get a gentle decrease of slow motion, and depending on the subject of your video, you may introduce artifacts and ghosting into your image. At this point, we should click pause and take a reality check - using optical flow isn’t going to turn 24fps footage and make it appear as if it was shot with a Phantom camera.
Therefore, you need to film at 24fps 4K.įirst, we’ll have our model walk towards the camera with a relatively static background, and we’re going to decrease the speed by 25 percent. Or perhaps you want your shot to enter slow-motion from a 24fps sequence, but your camera can’t do speed ramping. Perhaps your camera doesn’t shoot with a high FPS, or maybe it does but only at 1080p. In most circumstances, if you intend for your shot to be displayed in slow motion, it’s best to film at a higher frame rate.
Online slow motion video player software#
Essentially, the software interpolates the missing frame by analyzing and comparing pixel data from the surrounding frames, creating what would appear in-between. Optical flow, which is what we’re looking at today, uses motion estimation to generate new frames from the source. However, with duplicated frames, the appearance of the slow-motion will be staggered.įrame blend is similar in that it duplicates frames, but it blend the duplicated and original frames with cross dissolves to smooth out the jitteriness. Your NLE will duplicate the adjacent frames to make the footage playback slower. However, optical flow is just one of a few frame interpolation methods available. More recently, these features have been added directly to NLEs, as opposed to being individual software or plug-ins, allowing filmmakers to make their 24fps footage fluidly slower than usual. It’s also used in timelines to match media at different frame rates. It’s been around for a while and it’s often used to restore archival footage that wasn’t shot at today’s standard frame rate. However, as with most digital manipulation forms, whether saving highlights, removing background hiss, or frame interpolation, there’s only so far you can push something before the media breaks down.įrame interpolation is nothing new. Frame interpolation allows for the slowing effect. It allows us to take a 24fps shot, apply a time remapping method, and have the footage appear as if it was shot at a higher frame rate, then decreased to 24fps. Modern software gets us slow motion shots through frame interpolation.
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