Abstract: A main frame structure having box-section bearing beams of a launch vehicle engine includes a body. The body includes upper bearing table tops, lower bearing table tops, a cross gasket, a connecting ring and the box-section bearing beams. The box-section bearing beam includes an upper surface, a lower surface and two side beam walls, and has a cavity structure. Penetrating transverse ribs penetrating the two side beam walls are arranged on the box-section bearing beams, and one ends of the box-section bearing beams are circumferentially distributed at an outer side of the connecting ring. The lower bearing table tops are arranged at the outer side of the connecting ring, the lower bearing table tops are connected to the cross gasket, and the other ends of the upper surfaces and the lower surfaces are connected by means of arc chamfers and are connected to the upper bearing table tops.

Abstract: The disclosure provides a video coding method and a video coding apparatus and a video decoding method and a video decoding apparatus. The video coding method includes: when determining that a current block is coded in intra block copy prediction mode, carrying first indication information and second indication information in bitstream data corresponding to the current block by a video coder, wherein the first indication information specifies that a prediction mode of the current block is intra prediction, the second indication information specifies that the current block is coded in intra block copy prediction mode; and sending the bitstream data with the first indication information and the second indication information by the video coder.

Abstract: The disclosure provides a video coding method and a video coding apparatus and a video decoding method and a video decoding apparatus.