Recherche avancée

Sur d’autres sites (9250)

• Dynamic volume mixing with FFMPeg

  1er juin 2021, par jvhang

  I am streaming audio using FFMPeg and need to mix two audio sources using FFMpeg and set the volume level dynamically. I.e. once the stream starts, I need to be able update the ratio of the two volumes.

  


  Currently, I have the volume mixing and streaming working using the CLI version of FFMPeg but the volume mix ratio is static.

  


  Is there a way to dynamically set the volume ratio using the CLI tool ? Perhaps something with an FFMpeg expression ?

  


  Or is using the API the only option ? If so, can anyone point me towards an example of dynamically mixing audio ? I haven't been able to find one.

  


  Edit : here are the params I currently pass to mix audio. Again, this works fine, so not including the log as there is no error to fix. The question is how can I adjust the ratio of the amix mix after the process has launched. Willing to use the API if need be.

  


                  "-f rawvideo" + // container
                " -vcodec rawvideo" + // codec
                " -s " + width + "x" + height + // input video size, must be correct
                " -pix_fmt rgba" + // pixel format
                " -framerate " + frameRate +
                " -i pipe:0" + // from stdin in via pipe
               " -f dshow" +
                " -i audio=\"Stereo Mix (Realtek(R) Audio)\"" + //
                " -f dshow" +
                " -i audio=\"Microphone Array (Xbox NUI Sensor)\"" + // 
                " -filter_complex \"amix\"" +  // mix the two inputs, can added ratio if needed
                " -c:v libx264" + // x264 software encoder
                " -g " + frameRate *2 +
                " -keyint_min " + frameRate +
                " -c:a aac" + // audio format
                " -b:v 6M -maxrate 2M -bufsize 1M" + // constrain bitrate per twitch
                " -f flv" +
                " " + address 
            );


  


• 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

  


• Anomalie #4737 (En cours) : Erreur recherche dans les forums dans le privé

  18 avril 2021, par b b