As an expert in the field of film and video production, I can tell you that the term "strip" refers to a length of film that has a specific number of frames on it. In the context of film, a "box" is a term that is not commonly used to describe a length of film. However, if we were to consider a "box" as a metaphor for a frame of film, then we could discuss the number of frames in a 6-second strip.

The number of frames in a 6-second strip depends on the frame rate at which the film or video is shot. The most common frame rates are 24 frames per second (fps) for film and 30 fps (or 29.97 fps for NTSC video) for video.

Let's calculate the number of frames for both common frame rates:

1. For 24 fps:
6 seconds * 24 frames/second = 144 frames

2. For 30 fps (or 29.97 fps for NTSC):
6 seconds * 30 frames/second = 180 frames (or 178.2 frames for NTSC, which we can round to 178 for simplicity)

So, in a 6-second strip, there would be 144 boxes (frames) at 24 fps or 180 boxes (frames) at 30 fps.

read more >>

Step 5. Count the number of "R" waves, or inverted "V"s within 30 large squares on the strip. Each large square is equal to 0.2 seconds, 30 squares equals six seconds. Multiply that number by 10 to get the number of beats per minute.read more >>