Video resolution: 720 vs 704 differences

When converting a video ad video, the original width of the output image cannot be filled with 720 pixels of the entire screen after the CVBS signal output by the DVD is switched, however, there are about 8 pixels in the left and right, that is, there are only 704 pixels.

This involves the legal resolutions officially stipulated by the DVD. Here it may not be called resolutions, but it should be called "frame size"

720x576 (480 NTSC), known as the D1 Standard

It is also called "Full d1 ". In NTSC, "Full d1" refers to 720x480 pixels, while in PAL and SECAM systems, "Full d1" refers to 720x576.

704x576 (480 NTSC), called "cropped d1"

The reason for the emergence of corpped d1 is that the 8-pixel width on both sides of the video frame may not contain valid data. Therefore, you can crop this data to save bandwidth.

Most DVDs use the full D1 standard, and only some DVDs use "cropped d1"

From the above analysis, we can draw a conclusion:

704 non-standard DVD pixel size. To be consistent with the PAL/NTSC standard, it is normal to display 8 pixels black edges on the left and right.