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• AAC's converted from CAFs for HTTP Live Streaming

  13 mars 2014, par user2901994

  I have several AAC files that were converted from CAF files, for use in HTTP Live Streaming. The stream works, however there is a small gap between each AAC file. It is my understanding that this gap is caused by the "Priming" and "Remainder" frames that are attached to AAC files when they are transcoded from CAFs.

  My question is, is there any way to remove this gap ? Or use FFMpeg to wrap the files, (possibly in m4a ?) so that audio players (VLC, JWPlayer) will understand to skip the gap ?

• how to do mp4 stitching live

  19 avril 2015, par ldpm

  I want to do live mp4 video stitching on a site with javascript. I have looked ad ffmpeg and it looks awesome there is even a javascript version so that would solve this. But ffmpeg asm js weights 25 MB which would slow down the site a lot.

  I want to either :

  1) write a mp4 joiner in javascript from scratch but I am not able to find any good documentation about mp4 format

  2) strip ffmpeg javascript version to the bare minimum code required to join mp4 files but I am struggling to understand the ffmpeg lib structure or find good internal documentation

  any help will be greatly appreciated !

• Live Streaming using CloudFront and FFMPEG having delay issue

  22 avril 2021, par jitendra-gautam

  Live Streaming using CloudFront and FFMPEG having delay issue
I am using the NodeJS server with FFMPEG and live streaming to CloudFront, which is then consumed by many people via CloudFront.
Below is the data received at the user's end.

  


  #EXTM3U
#EXT-X-VERSION:3
#EXT-X-MEDIA-SEQUENCE:1317
#EXT-X-ALLOW-CACHE:NO
#EXT-X-TARGETDURATION:1
#EXTINF:0.833333,
1317.ts
#EXTINF:0.833333,
1318.ts
#EXTINF:0.833333,
1319.ts


  


  The problem is the next .ts file that is 1320.ts is taking time to create on the server, thus the user is seeing the loading sign, and when this 1320.ts is created on the server, thereafter only the user is able to see the next live stream frame.
How can the streaming be continuous ??
Below is the FFMPEG command that is being used :

  


  process = child_process.spawn('ffmpeg', commandArgs);


  


  let commandArgs = [
  '-loglevel',
  'debug',
  '-protocol_whitelist',
  'pipe,udp,rtp,rtmp,http,https,tcp',
  '-fflags',
  '+genpts',
  '-f',
  'sdp',
  '-i',
  'pipe:0',
  '-c:v',
  'libx264',
  '-crf',
  '21',
  '-preset',
  'veryfast',
  '-g',
  '25',
  '-sc_threshold',
  '0',
  '-c:a',
  'aac',
  '-b:a',
  '128k',
  '-ac',
  '2',
  '-hls_flags',
  'delete_segments+append_list',
  '-f',
  'segment',
  '-segment_list_flags',
  'live',
  '-segment_time',
  '1',
  '-segment_list_size',
  '3',
  '-segment_format',
  'mpegts',
  '-segment_list',
  `${RECORD_FILE_LOCATION_PATH}/${fileName}.m3u8`,
  `-segment_list_type`,
  'm3u8',
  `${RECORD_FILE_LOCATION_PATH}/%d.ts`
];