但是,当我尝试使用gcc编译时,我得到以下输出：

root:/Users/mbrodeur/Downloads/HACKATHON CONTENT/Tutorials-> gcc -o tutorial02 tutorial02.c -lavutil -lavformat -lavcodec -lz -lavutil -lm -lswscale -D_THREAD_SAFE -lSDL2
tutorial02.c: In function ‘main’:
tutorial02.c:41: error: ‘SDL_Overlay’ undeclared (first use in this function)
tutorial02.c:41: error: (Each undeclared identifier is reported only once
tutorial02.c:41: error: for each function it appears in.)
tutorial02.c:41: error: ‘bmp’ undeclared (first use in this function)
tutorial02.c:98: warning: assignment makes pointer from integer without a cast
tutorial02.c:110: error: ‘SDL_YV12_OVERLAY’ undeclared (first use in this function)

现在,我读到SDL_Overlay不再在SDL2中使用,所以在这里是问题.我一直在戳,但似乎找不到任何帮助.是否替代SDL_Overlay？有必要吗？

SDL_Overlay用于以下上下文：

SDL_Overlay     *bmp;
bmp = SDL_CreateYUVOverlay(pCodecCtx->width,pCodecCtx->height,SDL_YV12_OVERLAY,screen);