Abstract: The present disclosure relates to a method, apparatus, device, storage medium and program product for processing multimedia data. The method comprises: acquiring first multimedia draft data, wherein the first multimedia draft data is generated based on a segmented recording operation, video materials collected by the segmented recording operation being used to form video track segments in the first multimedia draft data; importing the first multimedia draft data into a first editor, so that the video track segments are displayed on a video editing track of the first editor; updating the first multimedia draft data in response to triggering a video editing operation for the video track segments on the first editor, to obtain second multimedia draft data; and generating a target video based on the second multimedia draft data in response to a trigger operation of video synthesis.

Abstract: A high-strength high-modulus polyimide fiber and its preparation method pertain to the technical field of high-performance organic fiber. This fiber includes the polyimide (PI) fiber made from 3,3?,4,4?-biphenyl tetracarboxylic diandhydride (BPDA), p-phenylenediamine (pPDA) and 2-(4-aminophenyl)-1H-benzimidazol-5-amine (BIA), wherein the molar ratio between PPDA and BIA is 1:10˜3:1. During the synthesis, other diamine and diandhydride monomers may also be added. In the preparation process, the gradient temperature reaction method and one-step continuous preparation method are adopted, the synthesis and processing difficulty caused by the increase of the content of BIA is overcome, the problem of poor uniformity and stability of fiber is solved and PI fiber with high strength and high modulus is obtained. Its strength may reach 4.5 GPa and modulus may reach 201 GPa.