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• ffmpeg live streaming for twitch has audio delay

  8 avril 2019, par ILoveCake

  I am relatively new to ffmpeg and live streaming.
  Trying to overlay some videos and an audio stream.
  One of the audio streams is delayed for about 2 seconds.

  Here are the details :

  stream 0 : video : a static background image

  stream 1 : video : an area of the screen recorded

  stream 2 : video : webcam video

  stream 3 : audio : webcam audio

  AREA_X=1024; AREA_Y=576; OFFSET_X=110; OFFSET_Y=145
  
  
  
  ffmpeg \
  
    -async 1 -vsync 1 \ 
  
    -loop 1 -i /home/helmi/Documents/Streaming.Chess.png \
  
    -thread_queue_size 512 -f x11grab -s ${AREA_X}x${AREA_Y} -framerate 25 -async 1 -vsync 1 -i :0.0+${OFFSET_X},${OFFSET_Y} \
  
    -thread_queue_size 512 -f v4l2 -framerate 25 -video_size 160x120 -i /dev/video0 \
  
    -thread_queue_size 512 -f pulse -ac 2 -ar 48000 -i default \
  
    -filter_complex \
  
    "color=0x336699cc:1024x64, drawtext=textfile=/home/helmi/Documents/Streaming.Chess.txt:fontfile=/home/helmi/.fonts/PersonalUse_Clipper_Script_fat.ttf:x=10:y=16:fontsize=40:fontcolor=white [bottom]; \
  
     [1:v]scale=960:-1,setpts=PTS-STARTPTS [a]; \
  
     [0:v]setpts=PTS-STARTPTS [0v]; \
  
     [0v][a]overlay=15:15 [b]; \
  
     [b][2:v]overlay=(W-w):0 [c]; \
  
     [c][bottom]overlay=0:H-64 [video]" \
  
     -map "[video]" -map "3:a" \
  
      -async 1 -vsync 1 \ 
  
      -c:v libx264 -b:v 500k -maxrate 500k -bufsize 1000k -framerate 25 -crf 17 -preset superfast -pix_fmt yuv420p -tune zerolatency \
  
        -force_key_frames "expr:gte(t,n_forced*2)" \
  
      -c:a aac -b:a 256k -ac 2 -af "aresample=async=1" \
  
    -f flv rtmp://live-vie.twitch.tv/app/...

  Am I missing something here ? Any help is appreciated.

• video streaming using recent frames only

  30 juillet 2019, par Max Paython

  I am trying to create a live video chat application, I am dealing with latency problems but these problems are not produced by encoding or overhead, rather from the definition of streaming itself.

  For example if I start the client program 15 seconds after the server program (start listening the port 15 seconds late), the client tries the play the 15 second old stream. (and fails because of the lack of I-frames introduced by x264 zero-latency, but this is not important)

  But I am trying to make it live. Old frames should be discarded and and the most recent frame should be showing (to a 1 second buffer maybe). I failed at doing this so I wanted to wait streaming until the peer is connected, but my goal is actually the first one.

  I am using ffmpeg for streaming. Can ffmpeg wait streaming until a single client starts listening (or connects) the port.

  How does applications like Skype or Hangouts handle this ? In these applications, if a user suddenly stops listening to the port (internet error for example) for 5 seconds, the chat will continue regularly after the connections is restored, and that user will not see the 5 second old frame but the new one. However I was not able to achieve this.

• switch between video streaming

  5 décembre 2012, par user1225084

  I am struggling with switching between multiple live streams. For example, I have five live streaming servers streaming(HTTP or RTSP) and I want to put some broker between those (five) streaming sources and destination so that output to the destination would be one video streaming (later I may change the streaming source again using switch). Broker plays role of switcher, My question is, is there such open source "switcher" ? Or how this technology works ?

  here is link to similar question but I want some open source or some brief guidance about how it could be implemented : http://forums.creativecow.net/thread/117/858680

  Thank You in advance