In 1080i, how many video frames are commonly transmitted each second?

In the 1080i format, which stands for 1080 interlaced, the standard transmission rate is 30 frames per second (fps). This format is designed to enhance the delivery of video content by alternating the progressive scan of horizontal lines, which gives the appearance of a full frame being displayed every 1/30 of a second. Interlacing helps reduce flicker and allows for smooth motion, making it suitable for television broadcasts and maintaining high resolution in fast-moving scenes.

The interlaced approach effectively transmits these frames without consuming excessive bandwidth, a crucial factor for broadcast television. In contrast, other frame rates like 24 fps or 60 fps are associated with different formats or applications, such as cinematic films or high-definition video. Thus, the correct answer reflects the standard usage in 1080i broadcasting.