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• How to make low latency and have good quality for hls live streaming

  7 juillet 2022, par parsa

  I used this code for create live stream from a mp4 file :

  



  ffmpeg -re -i input.mp4 
-c:a aac -c:v libx264 -s uhd2160 -f hls -hls_list_size 0 2160p/out.m3u8  
-c:a aac -c:v libx264 -s 2560x1440 -f hls -hls_list_size 0 1440p/out.m3u8  
-c:a aac -c:v libx264 -s hd1080 -f hls -hls_list_size 0 1080p/out.m3u8  
-c:a aac -c:v libx264 -s hd720 -f hls -hls_list_size 0 720p/out.m3u8  
-c:a aac -c:v libx264 -s hd480 -f hls -hls_list_size 0 480p/out.m3u8  
-c:a aac -c:v libx264 -s nhd  -f hls -hls_list_size 0 360p/out.m3u8 
-c:a aac -c:v libx264 -s cga  -f hls -hls_list_size 0 200p/out.m3u8


  



  but in streaming time, there are very latency.

  it seems, this latency exists on streaming videos which have very heigh quality,just like the video(4k) which I used that for livestream.

  How can I decrease this delay and decrease memory usage for that ?

  


• About real time video web streaming using ffserver(webm)

  29 avril 2016, par Potato

  I’m testing ffserver for real time streaming using web cam and mic.

  Use this ffserver conf

  HTTPPort 8090
  
  HTTPBindAddress 0.0.0.0
  
  MaxHTTPConnections 2000
  
  MaxClients 1000
  
  MaxBandwidth 1000000
  
  CustomLog -
  
  
  
  <feed>
  
  File /tmp/feed1.ffm
  
  FileMaxSize 1G
  
  ACL allow 127.0.0.1
  
  </feed>
  
  
  
  <stream>
  
  Feed feed1.ffm
  
  Format webm
  
  AudioBitRate 64
  
  AudioSampleRate 48000
  
  AudioChannels 1
  
  VideoCodec libvpx
  
  VideoSize 320x240
  
  VideoFrameRate 25
  
  AVOptionVideo flags +global_header
  
  AVOptionAudio flags +global_header
  
  PreRoll 15
  
  StartSendOnKey
  
  VideoBitRate 400
  
  </stream>

  and feed

  ffmpeg -f v4l2 -i /dev/video0 -f alsa - ac 1 - i hw:1 http://localhost:8090/feed1.ffm

  It’s okay when I approach with chrome http://IP_address:8090/live.webm

  But the problem is that the streaming shows little earlier moment, when I refresh the page. I think that’s not a delay problem.
  How can I use this for real time streaming.

  Regards.

• Audio Lag Issue in Long-term FFmpeg Live Streaming with x11grab and Pulse

  8 juillet 2024, par Dhairya Verma

  I am currently working on a live streaming project where I use FFmpeg with x11grab and PulseAudio to stream headlessly from a Linux server to an RTMP endpoint. While the setup generally works well, I am encountering an issue where the audio begins to lag behind the video after approximately two days of continuous streaming.

  


  "-hwaccel", "cuda",

"-f", "x11grab",

"-s", "1920x1080",

"-draw_mouse", "0",

"-thread_queue_size", "1024",

"-i", ":1",

"-f", "pulse",

"-r", "60",

"-thread_queue_size", "1024",

"-i", "VirtualSink.monitor",

"-c:v", "h264_nvenc",

"-preset:v", "hq",

"-b:v", "2500k",

"-maxrate", "2500k",

"-bufsize", "10000k",

"-vf", "fps=60,crop=1280:720:320:180,format=yuv420p",

"-g", "60",

"-c:a", "aac",

"-af", "adelay=900|900",

"-b:a", "128k",

"-ar", "44100",

"-fps_mode", "cfr",

"-async", "1",

"-f", "flv",

'RTMP_LINK',


  


  After two days of streaming, the audio noticeably lags behind the video. I have tried adjusting various settings and buffers, but the issue persists.

  


  Could anyone please provide any insights or suggestions on how to address this issue ?