Frame rate refers to the number of individual frames that comprise each second of video you record, also known as FPS (frames per second.) The most common frame rates in video are 24, 25 and 30 frames per second.
where, Shutter speed refers to the amount of time that each individual frame is exposed for. In video, the shutter speed you use will almost always be a fraction of a second. The number used in setting a camera’s shutter speed refers to the denominator of that fraction of a second.
For example, if you set your camera’s shutter speed to 60, that means that each frame is being exposed for 1/60th of a second. People often make the mistake of equating frame rate with shutter speed. In other words, some people determine that if they are shooting with a shutter speed of 1/100th of a second, that they are in turn shooting 100 frames per second. This is not the case. Depending on the camera you are using and the frame rate you have selected, you are probably shooting at either 24, 25 or 30 frames per second and exposing each individual frame for 1/100th of a second. Often abbreviated to just FPS, frames per second refers to the speed at which a camera can capture photos. At the time of writing this definition, Canon’s top-of-the-line pro bodies are capable of capturing up to 14 photos in a single second (14 fps). Technology is evolving rapidly though, and the chances are pretty good that by the time you read this glossary term, things will have reached an even higher level.
Lower end cameras like consumer point and shoots, tend to be much slower at around the 2-3 fps level. Mid-range DSLRs shoot in the 3-5fps range. The speed at which a camera can shoot, depends on several factors. Thee include the speed at which the shutter/mirror mechanism can re-cock itself and the speed of the camera’s internal memory. When you shoot a photo, the camera first writes that photo to internal memory called the buffer. The buffer then pushes the photo file over to your memory card.
Our eyes perceive time in windows of about 1/30 of a second. These windows have blurry edges, so unlike a camera shutter's instant opening and closing, we see things moving slower than about 30 frames per second as discrete events, and things moving faster as just blurs. Hollywood movies are shot at 24 frames per second, which is why we have slight jumpiness. Video is shot at about 60 fields (TV) or frames (HD) per second, which is why live sports events seem to have fluid motion on TV, while NFL newsreels shot on film at 24 FPS have jumpier motion.
As a rule of thumb, you want the denominator of your shutter speed to be approximately double the number of frames per second that you are recording. In other words, if you are recording at 30 frames per second, you want your shutter speed to be 1/60th of a second.