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• How can I improve the up-time of my coffee pot live stream ?

  26 avril 2017, par tww0003

  Some Background on the Project :

  Like most software developers I depend on coffee to keep me running, and so do my coworkers. I had an old iPhone sitting around, so I decided to pay homage to the first webcam and live stream my office coffee pot.

  The stream has become popular within my company, so I want to make sure it will stay online with as little effort possible on my part. As of right now, it will occasionally go down, and I have to manually get it up and running again.

  My Setup :

  I have nginx set up on a digital ocean server (my nginx.conf is shown below), and downloaded an rtmp streaming app for my iPhone.

  The phone is set to stream to example.com/live/stream and then I use an ffmpeg command to take that stream, strip the audio (the live stream is public and I don’t want coworkers to feel like they have to be careful about what they say), and then make it accessible at rtmp://example.com/live/coffee and example.com/hls/coffee.m3u8.

  Since I’m not too familiar with ffmpeg, I had to google around and find the appropriate command to strip the coffee stream of the audio and I found this :
  

  ffmpeg -i rtmp://localhost/live/stream -vcodec libx264 -vprofile baseline -acodec aac -strict -2 -f flv -an rtmp://localhost/live/coffee

  Essentially all I know about this command is that the input stream comes from, localhost/live/stream, it strips the audio with -an, and then it outputs to rtmp://localhost/live/coffee.

  I would assume that ffmpeg -i rtmp://localhost/live/stream -an rtmp://localhost/live/coffee would have the same effect, but the page I found the command on was dealing with ffmpeg, and nginx, so I figured the extra parameters were useful.

  What I’ve noticed with this command is that it will error out, taking the live stream down. I wrote a small bash script to rerun the command when it stops, but I don’t think this is the best solution.

  Here is the bash script :

  while true;
  
  do
  
          ffmpeg -i rtmp://localhost/live/stream -vcodec libx264 -vprofile baseline -acodec aac -strict -2 -f flv -an rtmp://localhost/live/coffee
  
          echo 'Something went wrong. Retrying...'
  
          sleep 1
  
  done

  I’m curious about 2 things :

  1. What is the best way to strip audio from an rtmp stream ?
  2. What is the proper configuration for nginx to ensure that my rtmp stream will stay up for as long as possible ?

  Since I have close to 0 experience with nginx, ffmpeg, and rtmp streaming any help, or tips would be appreciated.

  Here is my nginx.conf file :

  worker_processes  1;
  
  
  
  events {
  
      worker_connections  1024;
  
  }
  
  
  
  
  
  http {
  
      include       mime.types;
  
      default_type  application/octet-stream;
  
  
  
      sendfile        on;
  
  
  
      keepalive_timeout  65;
  
  
  
      server {
  
          listen       80;
  
          server_name  localhost;
  
  
  
          location / {
  
              root   html;
  
              index  index.html index.htm;
  
          }
  
  
  
          error_page   500 502 503 504  /50x.html;
  
          location = /50x.html {
  
              root   html;
  
          }
  
  
  
          location /stat {
  
                  rtmp_stat all;
  
                  rtmp_stat_stylesheet stat.xsl;
  
                  allow 127.0.0.1;
  
          }
  
          location /stat.xsl {
  
                  root html;
  
          }
  
          location /hls {
  
                  root /tmp;
  
                  add_header Cache-Control no-cache;
  
          }
  
          location /dash {
  
                  root /tmp;
  
                  add_header Cache-Control no-cache;
  
                  add_header Access-Control-Allow-Origin *;
  
          }
  
      }
  
  }
  
  
  
  rtmp {
  
  
  
      server {
  
  
  
          listen 1935;
  
          chunk_size 4000;
  
  
  
          application live {
  
              live on;
  
  
  
              hls on;
  
              hls_path /tmp/hls;
  
  
  
              dash on;
  
              dash_path /tmp/dash;
  
          }
  
      }
  
  }

  edit :
  I’m also running into this same issue : https://trac.ffmpeg.org/ticket/4401

• x264 Encoding use x264_picture_clean crash

  5 mai 2017, par Wong Sam

  When I use iphone encoding CMSampleBufferRef To H264, it offen crash at x264_picture_clean I dont’t know how to deal it

  enter image description here

  x264_picture_t* pPic_in; 

  here is my init about pPic_in

  pPic_in = (x264_picture_t*)malloc(sizeof(x264_picture_t));
  
  pPic_out = (x264_picture_t*)malloc(sizeof(x264_picture_t));
  
  
  
  x264_picture_init(pPic_out);
  
  
  
  x264_picture_init(pPic_in);
  
  x264_picture_alloc(pPic_in, csp, pParam->i_width, pParam->i_height);
  
  
  
  pPic_in->img.i_stride[0] = width;
  
  pPic_in->img.i_stride[1] = width / 2;
  
  pPic_in->img.i_stride[2] = width / 2;
  
  pPic_in->img.i_plane = 3;

  and i set data here

      picture_buf = yuv420_data;
  
      pPic_in->img.plane[0] = picture_buf;
  
      pPic_in->img.plane[1] = picture_buf + y_size;
  
      pPic_in->img.plane[2] = picture_buf + y_size*5/4;

  it looks well , when i run it on my iphone,but sometimes it will crash at

  x264_picture_clean

  here is more detail abuot pPic_in when crash occer
  enter image description here

  Thank u very much

• x264 Encoding use x264_picture_clean crash

  5 mai 2017, par Wong Sam

  When I use iphone encoding CMSampleBufferRef To H264, it offen crash at x264_picture_clean I dont’t know how to deal it

  enter image description here

  x264_picture_t* pPic_in; 

  here is my init about pPic_in

  pPic_in = (x264_picture_t*)malloc(sizeof(x264_picture_t));
  
  pPic_out = (x264_picture_t*)malloc(sizeof(x264_picture_t));
  
  
  
  x264_picture_init(pPic_out);
  
  
  
  x264_picture_init(pPic_in);
  
  x264_picture_alloc(pPic_in, csp, pParam->i_width, pParam->i_height);
  
  
  
  pPic_in->img.i_stride[0] = width;
  
  pPic_in->img.i_stride[1] = width / 2;
  
  pPic_in->img.i_stride[2] = width / 2;
  
  pPic_in->img.i_plane = 3;

  and i set data here

      picture_buf = yuv420_data;
  
      pPic_in->img.plane[0] = picture_buf;
  
      pPic_in->img.plane[1] = picture_buf + y_size;
  
      pPic_in->img.plane[2] = picture_buf + y_size*5/4;

  it looks well , when i run it on my iphone,but sometimes it will crash at

  x264_picture_clean

  here is more detail abuot pPic_in when crash occer
  enter image description here

  Thank u very much