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• How to play multiple video on top of each other with ffmpeg c programming

  13 septembre 2016, par Tom Goldberg

  I’m trying to develop a code which can plays multiple videos simultaneously with ffmpeg.
  I need to play a video on a 2x2 matrix background and another video in the top left corner of it.
  Problem : The top left corner video is flicking and not stable enough.
  top-left video is flicking while playing
  code :

  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);
  
    }  

  When i choose 0/1, i move between audio only.
  My question is : What should i code in order to make the top-left video stable to view ?

• How to play a part of the MP4 video stream ?

  14 novembre 2014, par AgentFire

  I have a URL (<ip>/ipcam/mpeg4.cgi</ip>) which points to my IP camera which is connected via Ethernet.
  Accessing the URL resuls in a infinite stream of video (possibly with audio) data.

  I would like to store this data into a video file and play it later with a video player (HTML5’s video tag is preferred as the player).

  However, a straightforward approach, which is simple saving the stream data into .mp4 file, didn’t work.

  I have looked into the file and here is what I saw (click to enlarge) :

  

  It turned out, there are some HTML headers, which I further on manually excluded using the binary editing tool, and yet no player could play the rest of the file.

  The HTML headers are :

  --myboundary
  
  Content-Type: image/mpeg4
  
  Content-Length: 76241
  
  X-Status: 0
  
  X-Tag: 1693923
  
  X-Flags: 0
  
  X-Alarm: 0
  
  X-Frametype: I
  
  X-Framerate: 30
  
  X-Resolution: 1920*1080
  
  X-Audio: 1
  
  X-Time: 2000-02-03 02:46:31
  
  alarm: 0000

  My question is pretty clear now, and I would like any help or suggestion. I suspect, I have to manually create some MP4 headers myself based on those values above, however, I fail to understand format descriptions such as these.

  I have the following video stream settings on my IP camera (click to enlarge) :

  

  I could also use the ffmpeg tool, but no matter how I try and mix the arguments to the program, it keeps telling me this error :

  

• Firefox doesn't play mp4 file in HTML5 video

  21 janvier 2016, par Developer

  I recorded a video with my mobile which had the format ".mp4". Now if I load that video in HTML5 video tag, I get an error HTTP "Content-Type" of "video/3gpp" is not supported. Why does Firefox consider the file as 3gpp although it is an mp4 file ?
  If I log the file properties when it is loaded on to browser, I see the following

  { name: "test.mp4", lastModified: 1434536249000, lastModifiedDate: Date 2015-06-17T10:17:29.000Z, size: 41151959, type: "video/mp4" }

  This means firefox identifies the type as mp4 only. But doesn’t play it giving the error HTTP "Content-Type" of "video/3gpp" is not supported.