We find that while the video is simple, it does a good job in explaining the methods on Apple’s iOS and Android to get slow motion footage ready for posting on the web or social media. There is some basic editing and trimming for cutting the nonaction parts.
You can find the official video link here if needed: https://www.cnet.com/videos/make-slow-motion-videos-on-a-phone/
Nick Moore the creator of the Youtube channel of the same name has done a primer video on the recording of audio along with high-speed video. He goes into some detail about the usability aspects and limitations of recording audiothat is usable. Interestingly it can also mean you are better off faking the audio in post production for a better effect especially if you want it for a movie or tv show that demands quality audio.
The frequencies needed and data capture rate matter a lot in slow motion audio recording. In the end, it is a balancing act of what can be heard by the human ear and what you can exploit on reasonable time frames. It is much easier for example to record audio up to 240fps but it becomes increasingly less usable the higher the frame rate goes. At 1000fps you probably will not have anything worth keeping.
There has been a lot of work put it developing software that can interpolate frames for video editing and compositing applications. Twixtor in the late 90’s was perhaps the first time the technology could make something worthwhile and really produce acceptable results in a computationally acceptable timeframe.
Today the most used algorithm is Adobe’s Optical Flow in Premiere or Time Warp in After Effects which use vector directional plus acceleration of pixel values to derive in between frame data to generate new frame information from the preceding frame as point A and the next frame as point B. The results can do some wonders to really slow down things above the frame rate ceiling of the camera.
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