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60 frames per second (fps) video footage




What is frame rate?

It simply is the rate at which frames of video are captured, transmitted and played. Frame rate is generally expressed in terms of frames per second (fps). The most common video frame rates are 23.976 fps, 25 fps, 29.97 fps, 50 fps and 59.94 fps. When dealing with interlaced video such as the NTSC 480i and ATSC 1080i standards which have an effective frame rate of 29.97 fps, the video fields are displayed at twice rate in comparison with the effective frame rate of 59.94.

What is High Frame Rate?

In simple terms the difference between so called High Frame Rate video footage and the normal format is an increased number of images being shown each second. The standard format for videos has long been around 24 frames per second. This number of images allows the human eye and brain to put things together in a flowing sequence so that you don’t notice the tiny gaps between each image. Because of these phenomena, the higher the FPS, the smoother the motion appears. In general, the minimum FPS needed to avoid jerky motion is about 30 FPS. For high-motion content, an encoding session around 60 FPS may be more beneficial.

Factors That Affect FPS

CPU:

A general rule of thumb is that the higher the frame rate, the higher the CPU requirement, or in case of video security solutions it is translated to more powerful DSP chip built into the camera. Although this makes the video more candy to the eye but it puts a burden on power consumption of the camera, the required bandwidth for transmission of higher quality video, the storage needed to save the video footage and finally the price tag of the camera because of the use of higher performance DSP chip.

Content Type:

Slow movement: If fewer than 15 percent of the pixels on any given frame change from frame to frame, your content is relatively stationary. For example, if your shot shows a person talking while sitting in a chair, the video frame is mainly updating around the person’s face. If your content exhibits slow movement, you can just stick to the 30 fps and have an acceptable image quality.

Fast movement: If more than 25 percent of the pixels on any given frame are changing, your content may be rapidly updating and may require more data to store the new information. A close-up shot of a situation in amusing park exhibits fast movement. Fast movement clips can require up to twice as much bit rate. This is where you need the extra fps for capturing all the details that happen in the camera’s field of view.

As stated previously, high-motion content requires more resources than low-motion video. Therefore, it is more important to properly select a CPU to handle the task, and to choose the right profile and key frame rate. If the encoding process cannot keep up with the content, it starts dropping frames.

Higher frame rates such as 60 fps are normally used to capture high-speed events with short duration. For example, casino security systems generally use high-fps cameras to detect suspicious activity at the gaming tables e.g. when someone in casino is cheating which can happen in less than a second. The higher frame rates also allow the security staff at a bank to see a suspect’s face clearly and also in distinguishing between fake and real money. Another application is reading the license plate of a fast moving vehicle and maybe identifying the face of the driver, etc. RedLeaf provides 60fps cameras so you don’t ever lose a single moment when using our security solutions.
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