Combining SD and HD Video

Many video producers find that they need to combine HD footage with SD footage, or combine several HD video sizes, within the same project. Converting a video format to a higher-resolution format is called upconverting, and the reverse is called downconverting. The process of upconverting and downconverting is not as simple as scaling a video frame. Changes in aspect ratio (4:3 for SD and 16:9 for HD), frame rate, and scanning method (interlaced and progressive) may also be involved.

For more information about downconverting, see Downconverting HD Video.

For more information about upconverting, see Upconverting SD Video.