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• ffmpeg - how to "set" continuity counters when generating .ts segments for HLS live streaming ?

  17 mars 2021, par Rob

  Say I have a batch of 40 JPEGs that represent 2 FPS video, and I want to generate a m3u8 playlist + h264 ts segments for an HLS live stream - so I do something like this :

  



  ffmpeg -y -framerate 2 -start_number 0 -i /frames/frame_%d.jpg -frames:v 40 \
       -c:v libx264 -crf 21 -preset veryfast -g 2 \
       -f hls -hls_time 4 -hls_list_size 5 -hls_flags omit_endlist \
       -start_number 0 -segment_start_number 0 -segment_list_flags +live video/stream.m3u8


  



  and it gives me a playlist like this :

  



  #EXTM3U
#EXT-X-VERSION:3
#EXT-X-TARGETDURATION:4
#EXT-X-MEDIA-SEQUENCE:0
#EXTINF:4.000000,
stream0.ts
#EXTINF:4.000000,
stream1.ts
#EXTINF:4.000000,
stream2.ts
#EXTINF:4.000000,
stream3.ts
#EXTINF:4.000000,
stream4.ts


  



  Great. Now say I get another batch of 40 JPEGS that follows the first, and I want to drop stream0.ts (the first 4 seconds / 8 frames of the original 40 JPEGS), and add a new stream5.ts (the first 4 seconds / 8 frames of the next 40 JPEGS) :

  



  ffmpeg -y -framerate 2 -start_number 8 -i /frames/frame_%d.jpg -frames:v 40 \
       -c:v libx264 -crf 21 -preset veryfast -g 2 \
       -f hls -hls_time 4 -hls_list_size 5 -hls_flags omit_endlist \
       -start_number 1 -segment_start_number 1 -segment_list_flags live video/stream.m3u8


  



  Then I get this :

  



  #EXTM3U
#EXT-X-VERSION:3
#EXT-X-TARGETDURATION:4
#EXT-X-MEDIA-SEQUENCE:1
#EXTINF:4.000000,
stream1.ts
#EXTINF:4.000000,
stream2.ts
#EXTINF:4.000000,
stream3.ts
#EXTINF:4.000000,
stream4.ts
#EXTINF:4.000000,
stream5.ts


  



  Great. But when I try to play the HLS stream with something like HLS.js or video.js, my video stream stalls out. And when I inspect the stream with TSLemurs HLS Checker tool, it warns me about "CC" errors, which I assume means continuity counter errors :

  



  

  



  How can I fix these continuity counter errors ? Is there anyway to do this at all with ffmpeg ?

  


• ffmpeg processing a live screen streaming has high latency

  27 février 2020, par Ant's

  I’m trying to do live screen sharing using ffmpeg using the following command :

  ffmpeg -f avfoundation -i "1:1" -c:v libx264 -threads 4 -preset ultrafast -c:a aac -ar 44100 -f flv rtmp://localhost/live/test

  Now I have a rtmp server, which receives the data and using flv.js, I’m showing the live stream video on the browser. The integration works perfectly fine, but the problem was the stream is getting delayed very much. There is a delay for say atleast 10s ; I’m not sure, whether we can make it less delay (more like instant screen share).

  Note : I’m using the Node RTMP server using https://github.com/illuspas/Node-Media-Server. The code for that is over here :

  const NodeMediaServer = require('node-media-server');
  
  
  
  const config = {
  
    rtmp: {
  
      port: 1935,
  
      chunk_size: 6000,
  
      gop_cache: true,
  
      ping: 30,
  
      ping_timeout: 60
  
    },
  
    http: {
  
      port: 8000,
  
      allow_origin: '*'
  
    }
  
  };
  
  
  
  var nms = new NodeMediaServer(config)
  
  nms.run();

  Any suggestions ? I’m on MacOS

• ffmpeg processing the live screen streaming has high latency

  27 février 2020, par Ant's

  I’m trying to do live screen sharing using ffmpeg using the following command :

  ffmpeg -f avfoundation -i "1:1" -c:v libx264 -threads 4 -preset ultrafast -c:a aac -ar 44100 -f flv rtmp://localhost/live/test

  Now I have a rtmp server, which receives the data and using flv.js, I’m showing the live stream video on the browser. The integration works perfectly fine, but the problem was the stream is getting delayed very much. There is a delay for say atleast 10s ; I’m not sure, whether we can make it less delay (more like instant screen share).

  Note : I’m using the Node RTMP server using https://github.com/illuspas/Node-Media-Server. The code for that is over here :

  const NodeMediaServer = require('node-media-server');
  
  
  
  const config = {
  
    rtmp: {
  
      port: 1935,
  
      chunk_size: 6000,
  
      gop_cache: true,
  
      ping: 30,
  
      ping_timeout: 60
  
    },
  
    http: {
  
      port: 8000,
  
      allow_origin: '*'
  
    }
  
  };
  
  
  
  var nms = new NodeMediaServer(config)
  
  nms.run();

  Any suggestions ? I’m on MacOS