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• Using FFmpeg with a file handle

  14 juillet 2014, par William Seemann

  Does anyone know if it’s possible to pass a FileDescriptor AND an byte offset to FFmpeg using the pipe protocol. If so, how do you do this programmatically ?

• crtmpserver error, appselector can be a final destination

  29 mai 2015, par user2366736

  I’m trying to setup a CRTMP serve by using its script run and its default script crtmpserver.lua. my os is centos6, and kenerl version 2.6.32.

  The server start ok, showes
  /crtmpserver/src/crtmpserver.cpp:267 GO ! GO ! GO !

  But when i use ffmpeg to push a flv stream, using the command
  ffmpeg -re -i test.flv -acodec copy -vcodec copy -f flv rtmp ://localhost:1935/appselector/room1

  it shows the error
  RTMP_ReadPacket, failed to read RTMP packet header
  rtmp ://localhost:1935/appselector/room1 : Operation not permitted

  and the crtmpserver shows the following error

  /applications/appselector/src/rtmpappprotocolhandler.cpp:66 appselector can be a final destination

  /thelib/src/protocols/rtmp/basertmpprotocol.cpp:1049 Unable to send rtmp message
  to application

  /thelib/src/netio/epoll/tcpcarrier.cpp:89 Unable to signal data available

  /thelib/src/netio/epoll/iohandlermanager.cpp:130 Handlers count changed : 11->10 IOHT_TCP_CARRIER

  /thelib/src/protocols/protocolmanager.cpp:45 Enqueue for delete for protocol [IR(3)]

  /thelib/src/application/baseclientapplication.cpp:246 Protocol [IR(3)] unregistered from application : appselector

  Does the default lua config has some wrong ?

• Segmentation fault receiving rtp stream using FFmpeg

  27 février 2018, par RoBo

  I would need some help with a project I am working on. Currently, I am trying to implement a program that is supposed to receiving a video stream via RTP protocol but I can’t seem to figure out a solution as to why it is not working.

  My program so far :

  #include 
  
  #include <libavformat></libavformat>avformat.h>
  
  #include <libswscale></libswscale>swscale.h>
  
  
  
  #define HOST "127.0.0.1"
  
  #define PORT "20000"
  
  #define NETWORK_ADDRESS "rtp://@"HOST":"PORT
  
  
  
  int main()
  
  {
  
      /** Register all muxers, demuxers and üprotocolls*/
  
      av_register_all();
  
      /** Global initialization of network protocolls */
  
      avformat_network_init();
  
  
  
      /** Open video file incoming from newtwork */
  
      AVFormatContext *pFormatCtxt = NULL;
  
      av_dict_set(&amp;pFormatCtxt, "protocol_whitelist", "rtp", 0);
  
      if ( avformat_open_input( &amp;pFormatCtxt, "stream.sdp", NULL, NULL ) != 0 )
  
          return -1;
  
  
  
      printf("Video file opened.\n");
  
  
  
      /** Retrieve stream information */
  
      if( avformat_find_stream_info( pFormatCtxt, NULL ) &lt; 0 )
  
      return -1;
  
      .
  
      .
  
      .
  
  }

  The .sdp file has been generated with the terminal command :

   ffmpeg -re -i GoP2_output_10fps.avi -vn -ac 1 -c:a copy -f rtp rtp://127.0.0.1:20000 > stream.sdp

  According to these instructions here I get the following content :

  v=0
  
  o=- 0 0 IN IP4 127.0.0.1
  
  s=No Name
  
  c=IN IP4 127.0.0.1
  
  t=0 0
  
  a=tool:libavformat 57.83.100
  
  m=video 20000 RTP/AVP 96
  
  b=AS:2418
  
  a=rtpmap:96 MP4V-ES/90000
  
  a=fmtp:96 profile-level-id=1;    config=000001B001000001B58913000001000000012000C48D8800553284A01443000001B24C61766335362E36302E313030

  To white list the RTP protocol I used av_dict_set(&pFormatCtxt, "protocol_whitelist", "rtp", 0) from this SO discussion here.

  Now after white listing it, the program execution stops after the avformat_open_input() function call and outputs a segmentation fault.
  I understand this error means I am trying to access memory that I am not supposed to, but I don’t understand why this is happening and how to proceed from here.

  As I am quite new to the topic of ffmpeg and haven’t been able to find a solution myself, I was hoping somebody here who knows their way around could provide me some help ?

  My OS is : Ubuntu 16.04