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• How to run the "ffmpeg -i input.mp4 output.avi" in Node.js ? [duplicate]

  3 septembre 2016, par Thales

  This question already has an answer here :

  • Execute a command line binary with Node.js
    
    6 answers
    

  I have a application on Electron that needs receive video and convert him another format, but I don’t know how to do. I’m thinking to do with node, but I need how to run the command "ffmpeg -i input.mp4 output.avi". I don’t know if this way is better. I thank first of all and I apologize for the ignorance.

• FFmpeg - concatenate variable length intro / outro fixed segments and separate audio track

  25 septembre 2017, par bobmarksie

  I’m trying to create an app which generates a video based on 3 main parts : -

  1. Intro - Variable length video ( 20 to 30 seconds long)
  2. Segments - 3 clips from a "segments video" - this is a fixed length video (always 400 seconds) which contains 100 separate videos all precisely 4 seconds in length e.g. "segment 1" is from 0 to 4 seconds and "segment 3" is from 8 to 12 seconds.
  3. Outro - Variable length video ( 10 to 20 seconds long)

  The user picks the intro, segments and outro from a list of videos and the app concatenates these together (and extracts 3 segments at random). The user also picks an audio file which plays for the entire video. The generated file should look something like the following : -

  GENERATED VIDEO

  VIDEO   | Intro (20 - 30) |  Seg 1 (4) |  Seg 2 (4) |  Seg 3 (4) |  Outro (10 - 20)  |
  
  --------+-----------------+------------+------------+------------+-------------------+
  
  AUDIO   |        Audio track which spans full video (e.g. 4 minutes long) ...        |

  I have been able to hack the following together using ffmpeg (which works) : -

  ffmpeg -y \
  
    -i audio/audio-19.m4a \
  
    -i videos/intro/intro-23.mkv \
  
    -i videos/segments/segments-88.mkv \
  
    -i videos/outro/outro-12.mkv \
  
    -filter_complex \
  
      "[1:v]trim=0:30,setpts=PTS-STARTPTS[v0]; \
  
      [0:a]atrim=0:30,asetpts=PTS-STARTPTS[a0]; \
  
      [2:v]trim=20:24,setpts=PTS-STARTPTS[v1]; \
  
      [0:a]atrim=30:34,asetpts=PTS-STARTPTS[a1]; \
  
      [2:v]trim=60:64,setpts=PTS-STARTPTS[v2]; \
  
      [0:a]atrim=34:38,asetpts=PTS-STARTPTS[a2]; \
  
      [2:v]trim=132:136,setpts=PTS-STARTPTS[v3]; \
  
      [0:a]atrim=38:42,asetpts=PTS-STARTPTS[a3]; \
  
      [3:v]trim=0:20,setpts=PTS-STARTPTS[v4]; \
  
      [0:a]atrim=42:62,asetpts=PTS-STARTPTS[a4]; \
  
      [v0][a0][v1][a1][v2][a2][v3][a3][v4][a4]concat=n=5:v=1:a=1[out]" \
  
    -map "[out]" generated.mkv

  However, there are 2 problems with this solution : -

  1. I’ve had to define the length of the intro video ([1:v]trim=0:30 ...) and the outro video ([3:v]trim=0:20 ...) - these are variable and would be preferable if I could simply concat the entire video.
  2. Each of the audio tracks are trimmed (using a running total from each video length) e.g. [0:a]atrim=0:30 ... => [0:a]atrim=30:34 ... => [0:a]atrim=34:38 ... => etc. Would be much easier if it simply said - "here’s the audio track - trim depending on the length of the generated video"

  Any advice is much appreciated !

• MP3 stream (ytdl-core) to PCM with fluent-ffmpeg

  3 juin 2021, par Schwieriiiiig

  So basically im trying to convert a MP3 stream, coming in from an NodeJS readable, to the PCM format so i can play it back via the Speaker Package.

  


  I tried many things including : node-lame, lame, lamejs -> so i figured why not use the ffmpeg libary directly.

  


  My Attempt (doesn't work) :

  


  const args = " u r l "
[...]
const dl = ytdl(args, {
    filter: "audioonly",
});
const speaker = new Speaker();
ffmpeg(dl).audioCodec("libmp3lame").format("s16le").pipe(speaker);


  


  It is however playing something, but it's more like pink or white noise.

  


  Thanks in advance !

  


  PS : i installed FFmpeg correctly
  
PSS : i use this in the main process from electron but i don't see why this would make a difference