NTSC video standard

Because of the many different types of media that can be used in ACID, time can be measured in a wide variety of ways. The right half of the time display always shows the measures.beats.milliseconds, as does the ruler at the top of the timeline. The left hand of the time display can be customized to fit your preferences. For example, when creating video projects for broadcast in the United States, you would want to use the NTSC video standard, which is SMPTE Drop (29.97 fps, video). To change the format displayed, right-click the time display or the Time Ruler below the timeline. Then, from the context menu, choose Time at Cursor Format and select the format. If the Time Ruler at the bottom of the timeline is not visible, from the View menu, select Time Ruler. Make sure Show Time Ruler is selected and has a check mark next to it. 

SMPTE 170M. 1999. Standard for Television—Composite Analog Video Signal, NTSC for Studio Applications. Society of Motion Picture and Television Engineers, White Plains, N.Y. 

As shown in Figure 11.9, an NTSC-standard Digital Video (DV) file in the United States would have dimensions of 720 X 480 at 29.970 frames per second ( s). So rendering would occur like this ... 

Worldwide, there were a limited number of standards based on CVBS the NTSC 525-line system and the SECAM 625-line and the 625-line systems. Additionally, there were some country-specific differences in places such as France and the UK. For more details see [1]. Limited variation is the main reason why analog video interfaces were so simple to use. With the emergence of digital images, however, the number of video interface standards has exploded. 

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