Inverse Telecine

Inverse Telecine (also abbreviated IVTC) is only necessary for film material that has been processed for the American television standard NTSC and describes the process of reducing the material stretched to 29.97 FPS with the help of fields to 23.976 FPS.

In the case of films, this effort is not very great, since the entire material has usually already been cut before the 3: 2 pull-down is used and the pull-down pattern does not change during the course of the film.

With series, music videos and other TV productions, however, the film material is already subjected to a 3: 2 pull-down before the actual cut and is also partially mixed with material that was filmed directly with a video camera at 29.97 FPS and therefore none at all Includes pull-down. This means that there is no longer a uniform pull-down pattern for the final material. The effort is then relatively high here, which is why encoders such as TMPGEnc already offer automatic detection, which does not, however, deliver completely satisfactory results.

Since modern screens such as plasma and LCD televisions, but also 100 Hz tube sets, work internally exclusively with progressive image material, i.e. can not display half images , the built-in deinterlacers must be able to use inverse telecine technology for NTSC material simply fading the fields would lead to an annoying jerking.