23.976p
Some 24p productions, especially those made only for NTSC TV and video distribution (e.g. in Canada or the USA), actually have a frame rate of 24 * 29.97 / 30 frame/s, or 23.976frame/s. Many use the term "24p" as a shorthand for this frame rate, since "23.976" does not roll off the tongue as easily. This is because the "30frame/s" framerate of NTSC is actually 30/100.1%, also referred to as 29.97frame/s – this framerate is matched when video at 23.976frame/s has a 3:2 pulldown applied. Similarly, 60i is shorthand for 60/100.1% fields per second. Some NLE programs may refer to 23.976 as 23.98, causing a small amount of confusion.
Nevertheless, even in NTSC regions, film productions are often shot at exactly 24 frame/s. This can be a source of confusion and technical difficulties if material is treated as normal video, since the slightly differing framerates can be problematic for video and audio sync. However, this is not a problem if the video material is merely treated as a carrier for material which is known by the editing system to be "true" 24frame/s, and audio is recorded separately from moving images, as is normal film practice.