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• recive klv data from a ffmpeg multicast

  5 avril 2019, par diego

  I am trying to get the klv data from a .mpeg.

  I tried this command and it works perfectly :

  ffmpeg -i video.mpg -map data-re -codec copy -f data data.klv

  (This first command has "data-re" which just works on linux, but it is the only way I found to get the .klv I need)

  Now I would like to open two CMD and transfer it by multicast, how could I do this ? i tried many comands like next ones, but I do not get the same .klv

  sender : ffmpeg -i video.mpeg -c copy -f mpegts udp://239.1.1.1:49410

  receiver : ffmpeg -i udp://239.1.1.1:49410 -map 0 -codec copy -f data data.klv

  I am new with ffmpeg and I do not know exactly what I need to change to get exactly whay I get in the first command.

  Thanks

• How to add silent data when no audio stream is flowing

  29 décembre 2020, par Edqe

  This is what I'm currently doing : How to insert silence pcm data when there is no data piping in

  


  Since fluent ffmpeg can use ffmpeg flags, is there a way to put silent data when no actual audio stream is received.

  


  Example :
  
/ represents real audio data
  
- represents silent
  
/////////////////-----///////----//////////
  
Receive audio    cut  data   cut data
  
From example above, put silent data on cut when no real data is received (I hope that explains a bit clearer)

  


  I found this discussion, does this work for the example above ? If so, how can I implement it ?

  


  Thanks in advance !

  


• I'm trying to merge videos using fluent-ffmpeg, but some times it merges videos , but whenever we tries to merge videos second time it shows error

  9 janvier 2024, par Asif Mujawar

  const express =require('express')
const app = express()
const ffmpeg = require('fluent-ffmpeg')
const ffmpegPath = require('@ffmpeg-installer/ffmpeg')
const ffprobe = require('@ffprobe-installer/ffprobe')

const first = './videos/first.mp4'
const second = './videos/second.mp4'
const third = './videos/third.mp4'
const fourth = './videos/fourth.mp4'

ffmpeg.setFfprobePath(ffprobe.path)
ffmpeg.setFfmpegPath(ffmpegPath.path)

app.use(express.json())

app.use("/",(req,res)=>{
    res.send("hello")

    ffmpeg()
    .input(first)
    .input(second)
 
    .on('end', function() {
      console.log('files have been merged succesfully');
    })
    .on('error', function(err) {
      console.log('an error happened: ' + err.message);
    })
    .mergeToFile("final.mp4")
  })
  

app.listen(8800,()=>{
    console.log("backend is running 8800")
})



  


  but it shows error whenever we try to merge videos second time

  


  an error happened : ffmpeg exited with code 1 : Cannot find a matching stream for unlabeled input pad 3 on filter Parsed_concat_0

  


  an error happened : ffmpeg exited with code 1 : Cannot find a matching stream for unlabeled input pad 3 on filter Parsed_concat_0