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• node.js ffmpeg spawn child_process unexpected data output

  5 septembre 2021, par PLNR

  
I'm rather new to backend stuff, so please excuse, if my question is trivial.
  
For an Intranet project, I want to present a video element in a webpage (React, HLS.js Player).
  
The video sources are mpeg-ts streams delivered as udp multicast.
  
A small node.js / express server should handle the ffmpeg commands, to transcode the multicast to hls to display them in a browser.
  

  
Problem is the Output :
  
The output is emitted on stderr... even the process is working as expected.
  
Here is the respective code I wrote for transcoding so far :

  


  const express = require("express");
const { spawn, exec } = require("child_process");
const process = require("process")

let ls;

const app = express();

app.get('/cam/:source', (body) => {
    const cam = body.params.source;
    console.log(cam);

    let source = "udp://239.1.1.1:4444";
    let stream = "/var/www/html/streams/tmp/cam1.m3u8"


    stream = spawn("ffmpeg", ["-re", "-i", source, "-c:v", "libx264", "-crf", "21", "-preset", "veryfast", "-c:a", "aac", "-b:a", "128k", "-ac", "2", "-f", "hls", "-hls_list_size", "5", "-hls_flags", "delete_segments", stream], {detached: true});

    stream.stdout.on("data", data => {
        console.log(`stdout: ${data}`);
    });

    stream.stderr.on("data", data => {
        console.log(`stderr: ${data}`);
    });

    stream.on("error", error => {
        console.log(`error: ${error.message}`);
    });

    stream.on("close", code => {
        console.log(`child process exited with code ${code}`);
    });
})

app.listen(5000, ()=> {
    console.log('Listening');
})


  


  This is maybe only cosmetics, but it makes me wondering.
  
Here is the terminal output :

  


  [nodemon] starting `node server.js`
Listening
camera stream reloaded
stderr: ffmpeg version 4.3.2-0+deb11u1ubuntu1 Copyright (c) 2000-2021 the FFmpeg developers
  built with gcc 10 (Ubuntu 10.2.1-20ubuntu1)

  --shortend--


pid:  4206
stderr: frame=    8 fps=0.0 q=0.0 size=N/A time=00:00:00.46 bitrate=N/A speed=0.931x    
pid:  4206
stderr: frame=   21 fps= 21 q=26.0 size=N/A time=00:00:00.96 bitrate=N/A speed=0.95x    
pid:  4206
stderr: frame=   33 fps= 22 q=26.0 size=N/A time=00:00:01.49 bitrate=N/A speed=0.982x    
pid:  4206
stderr: frame=   46 fps= 23 q=26.0 size=N/A time=00:00:02.00 bitrate=N/A speed=0.989x    
pid:  4206
stderr: frame=   58 fps= 23 q=26.0 size=N/A time=00:00:02.49 bitrate=N/A speed=0.986x    
pid:  4206


  


  and so on...
  

  
Any helpful information would be highly appreciated !
  
Many thanks in advance

  


• Is it possible to upstream an audio file like mp4 or mpd to node media server using FFmpeg ?

  28 mars 2022, par King Ses

  As shown in the example from https://github.com/illuspas/Node-Media-Server. The command allows a video to be published and accessed through the URL.

  


  


  ffmpeg -re -i INPUT_FILE_NAME -c copy -f flv rtmp ://localhost/live/STREAM_NAME

  


  


  Is it possible to do the same for audio-only ? I have tried reading through the documentation at https://ffmpeg.org/ffmpeg-formats.html but I'm really unclear about options and what they actually do. Apologies if I'm making things confusing.

  


• Can't stream video when using node-rtsp-stream latest version ?

  6 avril 2022, par cauchuyennhocuatoi

  I am using node-rtsp-stream latest version (0.0.9)

  


  https://www.npmjs.com/package/node-rtsp-stream


  


  I use it (node-rtsp-stream) to stream an IP camera. I also install the latest version of ffmpeg here :

  


  https://www.gyan.dev/ffmpeg/builds/ffmpeg-git-full.7z


  


  Here is my code

  


  Stream = require('node-rtsp-stream');
stream = new Stream({
  name: 'test',
  streamUrl: 'rtsp://username:password@IP:PORT/cam/realmonitor?channel=1&subtype=0',
  wsPort: 9999,
  ffmpegOptions: { // options ffmpeg flags
    '-r': 30 // options with required values specify the value after the key
  }
});


  


  After running nodejs server I get the following output :

  


  Metadata:
    title           : Media Server
  Duration: N/A, bitrate: N/A
  Stream #0:0: Video: hevc (Main), yuv420p(tv), 2688x1520, 25 tbr, 90k tbn
Stream mapping:
  Stream #0:0 -> #0:0 (hevc (native) -> mpeg1video (native))
Press [q] to stop, [?] for help
Output #0, mpegts, to 'pipe:':
  Metadata:
    title           : Media Server
    encoder         : Lavf59.20.101
  Stream #0:0: Video: mpeg1video, yuv420p, 2688x1520, q=2-31, 200 kb/s, 30 fps, 90k tbn
    Metadata:
      encoder         : Lavc59.25.100 mpeg1video
    Side data:
      cpb: bitrate max/min/avg: 0/0/200000 buffer size: 0 vbv_delay: N/A
frame=    0 fps=0.0 q=0.0 Lsize=       0kB time=00:00:00.00 bitrate=N/A speed=   0x
video:0kB audio:0kB subtitle:0kB other streams:0kB global headers:0kB muxing overhead: unknown
Output file is empty, nothing was encoded (check -ss / -t / -frames parameters if used)


  


  This result means I can't stream video from the camera yet. Output is empty, whereas if I use 0.04 version, I can streamming the videos. Below is output if I using node-rtsp-stream version 0.0.4 :

  


  Metadata:
    title           : Media Server
  Duration: N/A, start: 0.040000, bitrate: N/A
  Stream #0:0: Video: hevc (Main), yuv420p(tv), 2688x1520, 25 fps, 25 tbr, 90k tbn
Stream mapping:
  Stream #0:0 -> #0:0 (hevc (native) -> mpeg1video (native))
Press [q] to stop, [?] for help
Output #0, mpeg1video, to 'pipe:':
  Metadata:
    title           : Media Server
    encoder         : Lavf59.20.101
  Stream #0:0: Video: mpeg1video, yuv420p(tv, progressive), 2688x1520, q=2-31, 200 kb/s, 30 fps, 30 tbn
    Metadata:
      encoder         : Lavc59.25.100 mpeg1video
    Side data:
      cpb: bitrate max/min/avg: 0/0/200000 buffer size: 0 vbv_delay: N/A
frame=  314 fps= 32 q=24.8 size=    4768kB time=00:00:10.40 bitrate=3755.7kbits/s dup=51 drop=0 speed=1.05x 


  


  But I need to use the latest version (node-rtsp-stream 0.0.9) for my project, please take a look.