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• Streaming engines best practice in C

  20 novembre 2014, par ash

  LANG : C / ENV : Linux

  I am developing a streaming engine, for now I am able to start, stop and pause the stream, but seeking is the operation that’s giving me a lot of headache, I already asked a question here before and fixed some issues inside the code from the answers.

  Using lseek() function, I am passing the open streaming file descriptor as first argument, plus I am using UDP for transmitting, something like the following code :

  transport_fd = open(tsfile, O_RDONLY);
  
  int offset = 1024;
  
  off_t offsetIndicator;
  
  if ((offsetIndicator=lseek(transport_fd, offset, SEEK_CUR))<0) printf("Error seeking\n");

  Whenever I try to seek while streaming, the streaming stops and the pictures hangs.

  Is there anything I should pay attention to ?, i.e : like attempting to sleep() or nanosleep() after seeking into the file in order for the changes to take effect.

  I couldn’t find examples, papers or realted articles for best practices in such engines.

  EDIT :

  After testing, it seems like the file continued to stream but receiving devices on the network didn’t catch the stream connection anymore, and calculating the time it took to finish after subtract seeking time, the stream seems to be finished normally.

  CODE SNIPPET :

  while (!completed) 
  
  {
  
      while (/* Comparing conditions */ && !completed)
  
      { 
  
          if (seekLck == 1) // seekLck is a semaphore to test seek signal from father process initiated by 0
  
          {
  
              int offset = 1024;
  
              off_t offsetIndicator;
  
              if ((offsetIndicator=lseek(transport_fd, offset, SEEK_CUR))<0) 
  
                  printf("Error seeking\n");
  
              nanosleep(&nano_sleep_packet, 0); //Try to sleep to see if it is still hanging, didn't work 
  
              seekLck = 0;
  
          }   
  
          len = read(transport_fd, send_buf, packet_size);
  
          if(len < 0) {
  
              fprintf(stderr, "File read error \n");
  
              completed = 1;
  
          } 
  
          else if (len == 0)
  
          {
  
              fprintf(stderr, "Sent done\n");
  
              completed = 1;
  
          }
  
          else
  
          {
  
              sent = sendto(sockfdstr, send_buf, len, 0, (struct sockaddr *)&addr, sizeof(struct sockaddr_in));
  
              if(sent <= 0)
  
              {
  
                  perror("send(): error ");
  
                  completed = 1;
  
              }
  
          }
  
      }
  
      nanosleep(&nano_sleep_packet, 0);
  
  }
  
  close(transport_fd);
  
  close(sockfdstr);
  
  free(send_buf);
  
  printf("cleaning up\n");
  
  return 0;
  
  }

• node js (or other) as streaming server

  20 décembre 2013, par Abdul Ali

  Apologies if a simple question but cannot find anything helpful . Am also new to the streaming concept.

  Goal is to set up a server which keeps on listening for data on a speific port. The user will be sending sequence of images from their iphone (# of images unknown).

  when the data is receieved, ffmpeg should start to get data from that port (as input) and send those images to ffserver to be streamed as a live video.

  did try Nginx-Rtmp module but the iphone developer have informed that in iphone, only ip and port can be given to open a stream (and no other part of the url can be given e.g. streamname and application name in case of nginx-rtmp)

  Any help and guide will be appreciatd that what can be used to set up a free and very simple sever that simply receives the images which ffmpeg can capture and send to ffserver .

• libx264 fails on HTTP Live Streaming (FFmpeg)

  12 juillet 2016, par shintaroid

  I want to live stream with HTTP Live Streaming, but I have problem with libx264 or maybe something other.

  My hardware and software environment :

  • Macbook Pro
  • VirtualBox with Ubuntu 16.04
  • Nginx and FFmpeg (in Ubuntu)

  I am able to stream a static video file (in Ubuntu with Nginx and FFmpeg).
  The FFmpeg command is as following :

  $ffmpeg -i /my/sample/video.mp4 -codec:v libx264 -f hls /output/file.m3u8

  But when it comes to webcam (live streaming), Mac OS Safari fails to open the stream. I used the following command :

  $ffmpeg -i /dev/video0 -codec:v libx264 -f hls /output/file.m3u8

  I guess it’s the problem of libx264 because when I use mpeg2video encoder, Mac OS Safari indeed can play the stream :

  $ffmpeg -i /dev/video0 -codec:v mpeg2video -f hls /output/file.m3u8

  I know there is a library called video4linux2, should I use video4linux2 for capturing my webcam ? But I don’t know the appropriate FFmpeg command for HTTP Live Streaming (I tried FFserver but there is error something like cannot rename hls)

  anyone shed some light on my problem ?