Recherche avancée

Sur d’autres sites (4393)

• Red5 live stream - huge delay on localhost

  23 janvier 2013, par user1958067

  I m running Red5 1.0.0 RC1, with JW Player and ffmpeg on Linux Mint14

  There is a huge delay while streaming, even when everythings happening on my machine/localhost.

  I do following steps :

  1. FFmpeg : ffmpeg -i 'http://localhost:port' rtmp://localhost/oflaDemo/live.flv

  2. Red5 : TCPnoDelay ist set to true.

  3. JW Player : Bufferlength is set to 0. Also tried 2 and 3.

   :

      <code class="echappe-js">&lt;script type=&amp;#39;text/javascript&amp;#39;&gt;<br />
  
       jwplayer(&amp;#39;mediaspace&amp;#39;).setup({<br />
  
      &amp;#39;flashplayer&amp;#39;: &amp;#39;player.swf&amp;#39;,<br />
  
      &amp;#39;file&amp;#39;: &amp;#39;live&amp;#39;,<br />
  
      &amp;#39;type&amp;#39;: &amp;#39;rtmp&amp;#39;,<br />
  
      &amp;#39;streamer&amp;#39;: &amp;#39;rtmp://localhost/oflaDemo&amp;#39;,<br />
  
      &amp;#39;controlbar&amp;#39;: &amp;#39;none&amp;#39;,<br />
  
      &amp;#39;autostart&amp;#39;: &amp;#39;true&amp;#39;,<br />
  
      &amp;#39;bufferlength&amp;#39;: &amp;#39;3&amp;#39;,<br />
  
      &amp;#39;width&amp;#39;: &amp;#39;640&amp;#39;,<br />
  
      &amp;#39;height&amp;#39;: &amp;#39;380&amp;#39;<br />
  
    });<br />
  
  &lt;/script&gt;
  
  

  The delay is something between 7-10 seconds !
  This all is happening on and from localhost, so bandwith shouldnt be the issue.

• Live Streaming WebM with Wowza Server

  2 décembre 2010, par noreply@blogger.com (John Luther)

  Guest blogger Charlie Good is CTO and co-founder of Wowza Media Systems

  As a company, we at Wowza move fast and like to tinker. When WebM was announced in May, we saw it as a promising new approach to HTML5 video and decided to do an experiment with live WebM streaming over http.

  Adding WebM VP8 video and Vorbis audio to the other encoding formats that our server supported was easy (we designed the Wowza server to be codec-agnostic). We then created a WebMfile and implemented WebM HTTP streaming.

  We originally created the demo as a proof-of-concept for the IBC show in September, 2010 but have made it available to watch on our web site.

  The file is streamed live (more precisely, "pseudo-live") over http using the Wowza server-side publishing API (PDF). The result is very impressive ; playback starts fast and the VP8 image quality is fantastic.

  You will need a WebM-enabled browser or VLC media player 1.1.5 to view the live stream.

  If you’re interested in keeping up with Wowza’s WebM progress, visit Wowza Labs or drop us a note at info@wowzamedia.com.

  

• Programming in C : Opening, Reading and Transcoding of Live TV with libavcodec. libavformat etc

  19 décembre 2011, par mmoment

  I'm currently developing a live streaming Software for my University Project.

  I am supposed to open a Live Video Stream from a USB Stick( I am using the Hauppauge WinTV-HVR 950Q under Linux) and read the Stream.
  Then I'm supposed to transcode it to h246. and send it to some devices in the Network.

  My Problem

  ---

  I can use the v4l API to access the USB Stick, but transcoding does currently not work as far as I know, therefore I want to use the libav to do so. I know that using the command line tools transcoding of live streams with ffmpeg is not a big deal, but doing so in C seems to be more of a problem.

  1. Here's how I open some static Video File :

     static char* path = "./video.mpeg" ;
     AVFormatContext *pFormatCtx ;

     av_register_all() ;

     if(av_open_input_file(&pFormatCtx, path, NULL, 0, NULL) !=0)
     
     printf("Opening file \"%s\" failed", path) ;
     return -1 ;
     else printf("Opening the file \"%s\" succeeded", path) ;

  2. Here's how I understand to how open a Live Feed

     static char* path = "/dev/dvb/adapter0/dvr0" ;
     AVFormatContext *pFormatCtx ;

     av_register_all() ;
     avdevice_register_all() ;

     if(avformat_open_input(&pFormatCtx, path, NULL, NULL) != 0)
     
     perror("avformat_open_input") ;
     return -1 ;
     else printf("Yay") ;

  3. Here's how I understand to how open a Live Feed

     if(av_find_stream_info(pFormatCtx)<0)
     
     printf("Could not find any Stream Information the file \"%s\"", path) ;
     return -1 ;
     
     // Dump information about file onto standard error
     dump_format(pFormatCtx, 0, path, 0) ;
     AVCodecContext *pCodecCtx ;

     // Find the first video stream
     int videoStream=-1 ;
     for(i=0 ; inb_streams ; i++)
     

     if(pFormatCtx->streams[i]->codec->codec_type==AVMEDIA_TYPE_VIDEO)
     
     {
     
         videoStream=i;
     
         break;
     
     }

     if(videoStream==-1) return -1 ; // Didn't find a video stream

     // Get a pointer to the codec context for the video stream
     pCodecCtx=pFormatCtx->streams[videoStream]->codec ;

     AVCodec *pCodec ;

     // Find the decoder for the video stream
     pCodec=avcodec_find_decoder(pCodecCtx->codec_id) ;
     if(pCodec==NULL)
     
     fprintf(stderr, "Unsupported codec !\n") ;
     return -1 ; // Codec not found
     
     //Open codec
     if(avcodec_open(pCodecCtx, pCodec)<0)
     
     printf("Could not open the Codec") ;
     return -1 ; // Could not open codec
     

  So now how can you help me ?

  I would really appreciate it if anyone knew how to open a live stream and could give me a good example.