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• avformat/hls : Fix regression with ranged media segments

  26 juillet 2016, par Anssi Hannula

  avformat/hls : Fix regression with ranged media segments
  Commit 81306fd4bdf ("hls : eliminate ffurl_* usage", merged in d0fc5de3a6)
  
  changed the hls demuxer to use AVIOContext instead of URLContext for its
  
  HTTP requests.
  HLS demuxer uses the "offset" option of the http demuxer, requesting
  
  the initial file offset for the I/O (http URLProtocol uses the "Range :"
  
  HTTP header to try to accommodate that).
  However, the code in libavformat/aviobuf.c seems to be doing its own
  
  accounting for the current file offset (AVIOContext.pos), with the
  
  assumption that the initial offset is always zero.
  HLS demuxer does an explicit seek after open_url to account for cases
  
  where the "offset" was not effective (due to the URL being a local file
  
  or the HTTP server not obeying it), which should be a no-op in case the
  
  file offset is already at that position.
  However, since aviobuf.c code thinks the starting offset is 0, this
  
  doesn’t work properly.
  This breaks retrieval of ranged media segments.
  To fix the regression, just drop the seek call from the HLS demuxer when
  
  the HTTP(S) protocol is used.
  

  • [DH] libavformat/hls.c

• Republish RTMP or RTSP stream to Windows Media Services

  25 novembre 2016, par Ioannis Kokkinis

  I would like a definite answer on if it is possible to republish an RTMP stream to a windows media services publishing point with any free software (preferably ffmpeg).If yes, how ? This point can be a smooth streaming publishing point or the older version of media services.

  for the smooth streaming scenario there is some information on the internet, but no real answers or working examples on how it was achieved. People suggest to use ffmpeg this way :

  ffmpeg -re -i rtmp://xxx.xxx.xxx.xxx:1935/application/stream  -movflags isml+frag_keyframe -f ismv -threads 0 -acodec copy -vcodec copy 'http://xxx.xxx.xxx.xxx/publishpoint_name.isml/Streams(video)'

  This ofcourse requires for the the source video to be h264 and source audio to be aac. also requires that you have setup IIS and installed the smooth streaming web component and have setup a push publishing point with the name "publishpoint_name" (not sure if the isml is needed)

  The above does not work for me, and information is scarce on the internet.

• Passing FFmpeg encoder output to live 555 media server

  23 septembre 2013, par Ashutosh

  I need help on transmitting encoded output from encoder video output to live 555 media server.

      ret=avcodec_encode_video2(c,&pkt,(AVFrame*)&sc_dst_data,&gotim);
  
      source=ByteStreamMemoryBufferSource::createNew(*env,pkt.data,ret);
  
      if (source == NULL){}
  
      videoES = source;
  
      video_source=H264VideoStreamFramer::createNew(*env,videoES);
  
      video_sink->startPlaying(*video_source,afterPlaying, video_sink);

  The above codes doesn't transmit the streams properly.it breaks.any insights on how to do for a proper streaming in ffmpeg ?
  Please help.