mp4 format

MPEG-4 contains most of the functions of MPEG-1 and MPEG-2 and the advantages of other formats, and adds and expands support for Virtual Reality Modeling Language (VRML), object-oriented synthesis files (including sound effects, video and VRML objects), as well as digital rights management (DRM) and other interactive features. One of the features of MPEG-4 that is more advanced than MPEG-2 is that it no longer uses macro blocks for image analysis, but records changes on individuals in the image. Therefore, even if the image changes quickly and the bit rate is insufficient, the No block screen will appear.
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mp4 format

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MPEG-4 contains most of the functions of MPEG-1 and MPEG-2 and the advantages of other formats, and adds and expands support for Virtual Reality Modeling Language (VRML), object-oriented synthesis files (including sound effects, video and VRML objects), as well as digital rights management (DRM) and other interactive features. One of the features of MPEG-4 that is more advanced than MPEG-2 is that it no longer uses macro blocks for image analysis, but records changes on individuals in the image. Therefore, even if the image changes quickly and the bit rate is insufficient, the No block screen will appear.