Home page of James A. Mendrala

James A. Mendrala, CTS

Current time in Val Verde, a Northern suburb of Los Angeles, California

A Disscusion of 24 Frame and the new 48s Frame for DTV

This article, Mastering at 24p, was featured in the February, 1999 issue of Broadcast Engineering, page 92. The new ATSC standard permits the transmission of basically 5 video formats. 3 SDTV formats (4:3 and 16:9) and 2 HDTV formats (1920x1080 and 1280x720), along with their respective variations of field per second and/or frames per second. This seems to be creating an impossible scenario for the production and post production industry. In the past, the production and post production industries have delivered their products in either NTSC, PAL, or component at either 30 fps or 25 fps, interlaced. With the introduction of DTV, the networks and independent television groups are specifying different formats. Some want 1920x1080 at 30 fps interlaced, some want 1280x720 at 60 fps progressive, and others want 640x480 at 30fps, interlaced and so on. This is creating an impossible financial and operational burden on the production and post production industries.

Digital Cinema article

This article which appeared in the October, 1995 issue of TV Technology explores why television has thwarted the use of electronic means for distributing film to motion picture theaters. Issues of what is needed in theatrical motion picture presentation, such as resolution, contrast, colorimetry and the "film look" are discussed.

Aspect Ratio and Image Cut-Off

Motion picture films are photographed for projection in various aspect ratios (width of the projected picture divided by its height). The aspect ratio (A/R) used to film the picture is not always the same as that employedto project or televise the film. To further complicate matters motion pictures for theatrical projection are filmed with both flat and squeezed images. This was a contribution to the SMPTE Committee on Telecine Practice N19.18

24 Frames Progressive (24p) vs 30 Frames Interlaced (30i)

With today's new DTV standard it is obvious that 24 frame progressive should be of great interest to the broadcaster. The images are free of aliasing.

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