What does video post-processing mean?

Post-black is to insert a full black screen in the back end of the video for a period of time to reduce the video bit rate. For example, a three-minute video with 5000 bit rate and 60FPS will be double-clicked after uploading, which will reduce the picture quality. If you insert a black screen for five minutes later, the video bit rate may be recognized as lower than 2000 or even lower, so the website will not double-click the video.

Mailbox refers to the image displayed in the picture. In addition to the normal picture, there is a black border around the original photographic picture. This kind of black edge is caused by the difference in size and specification between the original image and the display image after conversion, which is generally called LB.

Its name comes from the fact that the shape of the effective graph in the graph is similar to that of a sealed letter. (For a detailed explanation, please refer to the name origin section described later. )

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It is explained here that letter boxes, mailboxes and black box screens with similar shapes are not used, because they are related to the existing word "box", but because of the combination of "box", that is, it means that the picture is in the shape of letters.