Question

我正在尝试开发一个可以与ffmpeg同时播放多个视频的代码。我需要在2x2矩阵背景上播放视频，并在其左上角播放另一个视频。问题：左上角的视频轻弹且不够稳定。 top-left video is flicking while playing 代码：

SDL_Surface *screen = SDL_SetVideoMode(640, 480, 24, 0);
void video_display(VideoState *is) {
  SDL_Rect rect;
  VideoPicture *vp;
  int w, h, x, y;
  h = screen->h;
  w = ((int)rint(h * aspect_ratio)) ;
  if(w > screen->w) {
    w = screen->w;
    h = ((int)rint(w / aspect_ratio)) ;
  }

  rect.x = (screen->w - w) / 2;
  rect.y = (screen->h - h) / 2;

  if(  is->video_id == 0 ){
     rect.w = w;
     rect.h = h;
     SDL_DisplayYUVOverlay(vp->bmp, &rect); // i think the problem is over here
  }
  else if( is->video_id == 1 ){
     rect.w = w/2;
     rect.h = h/2;
     SDL_DisplayYUVOverlay(vp->bmp, &rect);
  }

当我选择0/1时，我只在音频之间移动。我的问题是：为了让左上角的视频稳定可见，我应该编码什么？

如何使用ffmpeg c编程在彼此之上播放多个视频

0 个答案: