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• Nginx allow only my domain to access a video url

  4 septembre 2019, par Bruno F

  i’m setting up a web server that contains live video streaming embed into the html5 video tag. My workflow is to grab the rtsp video from an ip camera, decode it to a HLS format using ffmpeg and send the video to my server.
  Nginx allows access to the video through a url, which I put in my video tag as a source.

  Everything works perfectly, the only problem is that anyone can access the URL of the video and put that URL on their website without my permission.

  Is there any way to only allow my domain to access, and block for example www.domain2.com to put it into their video tag or other framework thath they use ? i’m think Nginx can do the job maybe.

  Here are the codes of Nginx and my html in case is needed.

  HTML :

  <video class="video-js vjs-default-skin vjs-big-play-centered vjs-fluid" controls="controls" preload="none">
  
  <source src="//mydomain.com/live/stream.m3u8" type="application/x-mpegURL"></source>
  
  </video>

  Nginx :

  location /live {
  
              types {
  
                      application/vnd.apple.mpegurl m3u8;
  
              }
  
              limit_conn addr 5;
  
              alias /home/stream;
  
              add_header Cache-Control no-cache;
  
              add_header 'Access-Control-Allow-Origin' '*';
  
      }

  Many thanks guys !

• ffmpeg drawtext to 'burn' text to video

  13 janvier 2018, par itsme

  I made a video in .MOV format which I edited until I got a mp4 file. Instead of subtitles, I used multiple drawtext feature (in a bash batch file) of ffmpeg to add texts.

  In a China Weibo post (like twitter), I link to my uploaded video in Youku. If I click on the youku link, it brings me to youku and the video plays with the text. When I click on the video image of Weibo (I supposed hosted video or live streaming , etc ?) the video plays but without the text from drawtext.

  Is there a way I could redo my drawtext (with some settings) so that the text could not be removed by weibo ?

  [edit]
  Very sorry. My mistake. I am new to Weibo with only 1 post. Weibo gives an image for preview of any video link. I think it is limited to 6 min 30secs. My drawtext starts only after.

• When is the callback function of avio_alloc_context() triggered as the official ffmpeg documents ?

  2 septembre 2021, par user14767109

  According to the official FFmpeg documents (such as the two links below), the fifth parameter of avio_alloc_context() function is the callback function. How can this callback function be triggered ?

  


  I don't understand the official documents very well.

  


  AVIOContext* avio_alloc_context(unsigned char * buffer,
    int     buffer_size,
    int     write_flag,
    void *  opaque,
    int(*)(void *opaque, uint8_t *buf, int buf_size)     read_packet,
    int(*)(void *opaque, uint8_t *buf, int buf_size)     write_packet,
    int64_t(*)(void *opaque, int64_t offset, int whence) seek
)


  


  Function link : function link

  


  Code link：code link