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• Streaming raw sound with FFMPEG

  30 juin 2020, par Dr_Click

  I'm using the ffmpeg library to decode / encode audio in JAVA, using the Process objets. The aim is to got the raw datas decoded by ffmpeg in my JAVA code and then, to send them back to ffmpeg to generate a stream or create a file.

  



  As JAVA sounds only allow wav audio datas, I made a first try with this command line :

  



  ffmpeg -i http://199.180.75.118:80 -acodec pcm_s16le -ar 44100 -ac 2 "/home/dr_click/montest.wav"


  



  It works. But, my goal is to get the frames on the fly and not a file. I thought about using a pipe but it seems it will work only with Linux and not with Windows (and no idea for MacOS)
So, I'd prefer to stream locally a wav file and to catch it with JAVA into a AudioInputStream.

  



  I wrote this command :

  



  ffmpeg -re -i http://199.180.75.118:80 -acodec pcm_s16le -ar 44100 -ac 2 -f rtp rtp://127.0.0.1:1234


  



  It semms to work on the server side. But, when I enter the below command line on the server side :

  



  ffplay rtp://127.0.0.1:1234


  



  It doesn't work at all. I got this error :

  



  

  • [rtp @ 0x7f29c8000b80] Unable to receive RTP payload type 97 without an SDP file describing it

  


  



  If I try the couple :

  



  ffmpeg -i http://199.180.75.118:80 -acodec pcm_s16le -ar 44100 -ac 2 -f rtp -sdp_file /home/dr_click/audio.sdp rtp://127.0.1.1:1234


  



  and

  



  ffplay /home/dr_click/audio.sdp


  



  I got the following error :

  



  

  • [rtp @ 0x7f7d00008040] Protocol 'rtp' not on whitelist 'file,crypto' ! if

  


  



  And if I finally try :

  



  fmpeg -protocol_whitelist file,http,rtp,tcp -i http://199.180.75.118:80 -acodec pcm_s16le -ar 44100 -ac 2 -f rtp -sdp_file /home/dr_click/audio.sdp rtp://127.0.1.1:1234


  



  I still get the same error.

  



  Which point do I miss to stream locally some raw datas and catch them back in the AudioInputStream ?

  



  Thank you for all your replies.

  


• Combien audio input with infinite loop sound on FFMpeg for rPi

  6 mars 2021, par FoxFr

  Someone can say me how its the best way to combine (mixing) the sound input from a Jack with an infinite loop sound on FFMpeg ? i seen many thing about this but still crashed my test

  


  Goal ? use the infinite loop for a bed, with a voice from mic (with jack) over the bed
the ultimate will be have a parameter for the volume of input jack & bed

  


  So clear ?

  


  ffmpeg \
-i /dev/video0 \
-i /dev/video2 \
-stream_loop -1 -re -i "/home/pi/videopi/bed.mp3" \
-filter_complex "[0][1]overlay=enable='lt(mod(t,60),30)'[v];[v]drawtext=textfile=/home/pi/videopi/gps.txt:reload=1:x=30:y=100:fontfile=OpenSans.ttf:font$
-map "[v]" \
-map 2:a \
-c:v libx264 -b:v 4000k -maxrate 4000k -bufsize 8000k -g 50 -c:a aac \
-f flv rtmp://a.rtmp.youtube.com/live2/XXXXXXXXXX


  


  Many many thkx

  


• Assign output to a variable instead to a Output file

  25 juin 2013, par rash

  Here is the Python code :

  import subprocess 
  
  
  
  cmnd = ["ffmpeg", "-i", "/home/xincoz/test/connect.flv", "-acodec", "copy", "-ss", "00:00:00", "-t", "00:00:30", "/home/xincoz/test/output.flv"]
  
  
  
  subprocess.call(cmnd)

  Here I get the 30sec long video output file output.flv from connect.flv video. But i want to store that 30sec long binary data in a variable instead of copying that into an output file.
  How can I able to do that ?

  Please help me. Thanks a lot in advance.