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• FFMPEG + SDL : How To Show Multi Frames In Separate Region ?

  19 mai 2014, par user3051473

  I’m using ffmpeg and SDL to develop an camera monitor APP and I want to show four separate streams at the same time(via four rtsp source). As following figure out :

  Now I achieve this by setting the SDL display region, and I identify different display region by using the different SDL_Rect identifying by the variable i(from 1 - 4).

  But this cause the efficient problem. For every region, I need to scale to the whole screen and lock/unlock screen, then display.

  I’m wondering that, Can I merge 4 different AVFrame(come from REG1 - REG4) into the whole picture and then show this picture ?

  Hope that the describe about is detail enough for you to konw my problem.
  Also thanks for your help.

  -------------------
  
  -        -        -
  
  -  REG1  -  REG2  -
  
  -        -        -
  
  -------------------
  
  -        -        -
  
  -  REG3  -  REG4  -
  
  -        -        -
  
  -------------------
  
  
  
  public void ShowFrame(AVFrame *pFrame, AVCodecContext *pCodecContext)
  
  {
  
      SDL_LockYUVOverlay(pBmp);
  
      AVPicture pict;
  
  
  
      // TODO scale pFrame to pict
  
      // ...
  
  
  
      SDL_UnlockYUVOverlay(pBmp);
  
  
  
      // WIDTH and HEIGHT represent the whole screen size
  
      SDL_Rect rect;
  
      rect.x = (WIDTH / 2) * (i % 2);
  
      rect.y = (HEIGHT / 2) * (i > 1 ? 1: 0);
  
      rect.w = WIDTH / 2;
  
      rect.h = HEIGHT / 2;
  
      SDL_DisplayYUVOverlay(pBmp, &rect);
  
  }

• capture attribute to show the camera directly

  29 août 2017, par PKnight

  Dialog Box

  I would expect specifying the capture attribute to show the camera directly, rather than having to navigate through the dialog boxes above.
  I want the camera to go directly and I can record a video.

  <input type="file" accept="video/mp4,video/x-m4v,video/*" capture="camcorder" />

  I tried in several ways, but none worked. It’s always shows the dialog box to choose a camera. Can anybody help me ? Thank you

• Can FFmpeg show only media info and encoding progress/statistics ? [on hold]

  19 octobre 2017, par NESHOM

  Is there a way to force FFmpeg to only show media info (including format, codec, duration, etc) and encoding progress/statistics in output console ?

  Currently I am using these commands :

  -v quiet -stats

  However, it only shows encoding progress/statistics. I am wondering if I can add media information SPECIFICALLY duration of the input/source file into this.