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• Append multiple audio files into a single audio file with overlap

  4 octobre 2022, par user3564069

  I have been trying to make an application that takes an array of wav or mp3 files as an input.
I want it to then produce an output file of all the wavs or mp3's in sequential order they were added, but each wav added should overlap the previous wav file added by half a second.

  


  So it should be Wav1 -> wav2 -> wav3 = output.wav, but with the start of wav2 overlapping wav1 and wav3 overlapping wav2.

  


  I have tried to use SOX to create silence for each required duration per wav and then append it and outputted a new wav file and then join them all at the end, while this works it is incredibly slow.

  


  I am open to any suggestions IE FFMPEG.
I tried using suggestions here FFMPEG ADelay using a FFMPEG feature known as ADelay but i was unable to make it work past 2 input files

  


• fluent ffmpeg => how to trim and concate parts of video into one output file without writing many output files. Make a most efficient solution

  30 avril 2024, par Shreyansh Gupta

  I'm currently working on a online video website and i need to make a quick preview of videos using random timestamps and duration of the video.

  


  Suppose the video is of 15 min then i want to cut out some parts like ->

  


  1. from 00:00:40 take out next 2s 
2. from 00:01:20 take out next 2s 
3. ... and so on until the new video becomes 15s


  


  How can i do this with fluent-ffmpeg in the nodejs project

  


  Can i get the most efficient way of doing this without writing many output files and then concating them separately and removing then later

  


  Only concating the trimmed videos in one output file and save when it is done.

  


  I also came through a solution that uses complex filters but i don't know how to use it

  


     ffmpeg("video.mp4")
  .complexFilter([
    ....// some filters here

  ])
  .on('end',  function () {
    console.log('files have been merged and saved.')
  })
  .on('error',function (err){
    console.log(err)
  }
  .saveToFile("output.mp4")```


  


• fftools/ffmpeg_opt : move opening output files into a new file

  13 octobre 2022, par Anton Khirnov

  fftools/ffmpeg_opt : move opening output files into a new file
  ffmpeg_opt.c currently contains code for
  
   parsing the options provided on the command line
  
   opening and initializing input files based on these options
  
   opening and initializing output files based on these options
  The code dealing with each of these is for the most part disjoint, so it
  
  makes sense to move them to separate files. Beyond reducing the quite
  
  considerable size of ffmpeg_opt.c, this will also allow exposing muxer
  
  internals (currently private to ffmpeg_mux.c) to the initialization
  
  code, thus removing the awkward separation currently in place.
  

  • [DH] fftools/Makefile
  • [DH] fftools/ffmpeg.h
  • [DH] fftools/ffmpeg_mux_init.c
  • [DH] fftools/ffmpeg_opt.c