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• node.js ffmpeg spawn child_process unexpected data output and not possible to kill or stop

  1er 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) with the possibility reload the stream in case it hung.
  
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.
  

  
My Problem is, that I am unable to stop the process...
  
I've tried to SIGINT, SIGTERM the process with it's pid, but the encoding is just going on.

  


  Here is the code I wrote for transcoding so far :

  


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

let ls;
let pid;

const app = express();

app.use(cors());

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});

    pid = stream.pid;

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

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

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

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

app.get('/cam/quit', () => {
    process.kill(pid, 'SIGINT')
})

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


  


  On requesting the /cam/quit i would expect the process to stop... but it doesn't.
  
I've tried :

  


  app.get('/cam/quit', () => {
    process.kill(pid, 'SIGINT')
})


  


  app.get('/cam/quit', () => {
    process.kill(stream.pid, 'SIGINT')
})


  


  app.get('/cam/quit', () => {
    stream.kill(pid, 'SIGINT')
})


  


  app.get('/cam/quit', () => {
    stream.kill(0, 'SIGINT')
})


  


  But none of this worked... do I miss something ? Is there something I need to change ?

  


  Problem 2 - Output :
  
The output is emitted on stderr... even the process is working as expected.
  
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)
  configuration: --prefix=/usr --extra-version=0+deb11u1ubuntu1 --toolchain=hardened --libdir=/usr/lib/x86_64-linux-gnu --incdir=/usr/include/x86_64-linux-gnu --arch=amd64 --enable-gpl --disable-stripping --enable-avresample --disable-filter=resample --enable-gnutls --enable-ladspa --enable-libaom --enable-libass --enable-libbluray --enable-libbs2b --enable-libcaca --enable-libcdio --enable-libcodec2 --enable-libdav1d --enable-libflite --enable-libfontconfig --enable-libfreetype --enable-libfribidi --enable-libgme --enable-libgsm --enable-libjack --enable-libmp3lame --enable-libmysofa --enable-libopenjpeg --enable-libopenmpt --enable-libopus --enable-libpulse --enable-librabbitmq --enable-librsvg --enable-librubberband --enable-libshine --enable-libsnappy --enable-libsoxr --enable-libspeex --enable-libsrt --enable-libssh --enable-libtheora --enable-libtwolame --enable-libvidstab --enable-libvorbis --enable-libvpx --enable-libwavpack --enable-libwebp --enable-libx265 --enable-libxml2 --enable-libxvid --enable-libzmq --enable-libzvbi --enable-lv2 --enable-omx --enable-openal --enable-opencl --enable-opengl --enable-sdl2 --enable-pocketsphinx --enable-libmfx --enable-libdc1394 --enable-libdrm --enable-libiec61883 --enable-nvenc --enable-chromaprint --enable-frei0r --enable-libx264 --enable-shared
  libavutil      56. 51.100 / 56. 51.100
  libavcodec     58. 91.100 / 58. 91.100
  libavformat    58. 45.100 / 58. 45.100
  libavdevice    58. 10.100 / 58. 10.100
  libavfilter     7. 85.100 /  7. 85.100
  libavresample   4.  0.  0 /  4.  0.  0
  libswscale      5.  7.100 /  5.  7.100
  libswresample   3.  7.100 /  3.  7.100
  libpostproc    55.  7.100 / 55.  7.100

pid:  4206
stderr: Input #0, mov,mp4,m4a,3gp,3g2,mj2, from 'udp://239.1.1.1':
  Metadata:
    major_brand     : isom
    minor_version   : 512
    compatible_brands: isomiso2avc1mp41
    creation_time   : 
pid:  4206
stderr: 1970-01-01T00:00:00.000000Z
    encoder         : Lavf52.54.0
  Duration: 01:55:59.20, start: 0.000000, bitrate: 1436 kb/s
    Stream #0:0(und): Video: h264 (Constrained Baseline) (avc1 / 0x31637661), yuv420p, 720x384 [SAR 1:1 DAR 15:8], 1272 kb/s, 25 fps, 25 tbr, 25 tbn, 50 tbc (default)
    Metadata:
      creation_time   : 1970-01-01T00:00:00.000000Z
      handler_name    : VideoHandler
    Stream #0:1(und): Audio: aac (LC) (mp4a / 0x6134706D), 48000 Hz, stereo, fltp, 159 kb/s (default)
    Metadata:
      creation_time   : 1970-01-01T00:00:00.000000Z
      handler_name    : SoundHandler

pid:  4206
stderr: Stream mapping:
  Stream #0:0 -> #0:0 (h264 (native) -> h264 (libx264))
  Stream #0:1 -> #0:1 (aac (native) -> aac (native))
Press [q] to stop, [?] for help

pid:  4206
stderr: [libx264 @ 0x5616b38b5440] using SAR=1/1

pid:  4206
stderr: [libx264 @ 0x5616b38b5440] using cpu capabilities: MMX2 SSE2Fast SSSE3 SSE4.2 AVX FMA3 BMI2 AVX2

pid:  4206
stderr: [libx264 @ 0x5616b38b5440] profile High, level 3.0, 4:2:0, 8-bit

pid:  4206
stderr: [libx264 @ 0x5616b38b5440] 264 - core 160 r3011 cde9a93 - H.264/MPEG-4 AVC codec - Copyleft 2003-2020 - http://www.videolan.org/x264.html - options: cabac=1 ref=1 deblock=1:0:0 analyse=0x3:0x113 me=hex subme=2 psy=1 psy_rd=1.00:0.00 mixed_ref=0 me_range=16 chroma_me=1 trellis=0 8x8dct=1 cqm=0 deadzone=21,11 fast_pskip=1 chroma_qp_offset=0 threads=6 lookahead_threads=2 sliced_threads=0 nr=0 decimate=1 interlaced=0 bluray_compat=0 constrained_intra=0 bframes=3 b_pyramid=2 b_adapt=1 b_bias=0 direct=1 weightb=1 open_gop=0 weightp=1 keyint=250 keyint_min=25 scenecut=40 intra_refresh=0 rc_lookahead=10 rc=crf mbtree=1 crf=21.0 qcomp=0.60 qpmin=0 qpmax=69 qpstep=4 ip_ratio=1.40 aq=1:1.00
Output #0, hls, to '/var/www/html/streams/tmp/aft.m3u8':
  Metadata:
    major_brand     : isom
    minor_version   : 512
    compatible_brands: isomiso2avc1mp41
    encoder         : Lavf58.45.100
    Stream #0:0(und): Video: h264 (libx264), yuv420p, 720x384 [SAR 1:1 DAR 15:8], q=-1--1, 25 fps, 90k tbn, 25 tbc (default)
    Metadata:
      creation_time   : 1970-01-01T00:00:00.000000Z
      handler_name    : VideoHandler
      encoder         : Lavc58.91.100 libx264
    Side data:
      cpb: bitrate max/min/avg: 0/0/0 buffer size: 0 vbv_delay: N/A
    Stream #0:1(und): Audio: aac (LC), 48000 Hz, stereo, fltp, 128 kb/s (default)
    Metadata:
      creation_time   : 1970-01-01T00:00:00.000000Z
      handler_name    : SoundHandler
      encoder         : Lavc58.91.100 aac

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 help would be highly appreciated !
  
Many thanks in advance

  


• VB.NET FFMPEG Stops

  18 mars 2012, par Mcqueen_23

  Hi evryone i'm trying to convert files using ffmpeg

  my codes only fetched

  
  — -Skip---
  Input #0, mov,mp4,m4a,3gp,3g2,mj2, from 'Enrique Iglesias - Tonight.mp4' :
    Metadata :
      major_brand : mp42
      minor_version : 0
      compatible_brands : isommp42
      creation_time : 2011-03-20 19:07:02
    Duration : 00:03:50.05, start : 0.000000, bitrate : 219 kb/s
      Stream #0.0(und) : Video : h264, yuv420p, 480x360 [PAR 1:1 DAR 4:3], 117 kb/s, 29.97 fps, 59.75 tbr, 1k tbn, 59.83 tbc
      Metadata :
        creation_time : 1970-01-01 00:00:00
      Stream #0.1(und) : Audio : aac, 44100 Hz, stereo, s16, 95 kb/s
      Metadata :
        creation_time : 2011-03-20 19:07:03
  Output #0, mp3, to 'Enrique Iglesias - Tonight.mp3' :
    Metadata :
      major_brand : mp42
      minor_version : 0
      compatible_brands : isommp42
      TDEN : 2011-03-20 19:07:02
      TSSE : Lavf52.94.0
      Stream #0.0(und) : Audio : libmp3lame, 44100 Hz, stereo, s16, 64 kb/s
      Metadata :
        creation_time : 2011-03-20 19:07:03
  

  and cannot i cannot get the next lines ung Proccess.ErrorDataReceived event

  Here are my Codes

      Public Structure ItemStruct
  
          Public ID, URL, FileName, FileExt, ConvertExt, ConvertQuery As String
  
          Public FileSize As Int64
  
          Public Method, status As Method
  
          Public prog_bar As ProgressBar
  
          Public DeleteOrigin, TrimStart, TrimEnd As Boolean
  
      End Structure
  
  
  
      Friend Class Converter
  
          Public busy As Boolean = False
  
          Private _Item As ItemStruct
  
          Public Event ProgressChange(ByVal id As String, ByVal percent As Integer, ByVal etr As TimeSpan)
  
          Public Event ConvertFinish(ByVal id As String)
  
          Private m As Threading.Thread
  
          Private WithEvents timer As New Timer With {.Interval = 100}
  
  
  
          Public Sub New()
  
          End Sub
  
  
  
          Public Sub New(ByVal item As ItemStruct)
  
              _Item = item
  
              m = New Threading.Thread(AddressOf Convert)
  
          End Sub
  
  
  
          Public Sub Start()
  
              m.Start()
  
              timer.Start()
  
          End Sub
  
  
  
          Private duration As Decimal = 0.0F
  
          Private current As Decimal = 0.0F
  
          Private varIsSet As Boolean = False
  
          Private Sub Convert()
  
              Dim cmd As String = _Item.ConvertQuery
  
              Dim inputName As String = _Item.URL
  
              Dim fName As String = _Item.FileName & _Item.FileExt
  
              Dim dir As String = _Item.URL.Replace(fName, "")
  
              Dim ouputName As String = dir & _Item.FileName & "." & _Item.ConvertExt
  
              cmd = Replace(cmd, "--i", inputName)
  
              cmd = Replace(cmd, "--o", ouputName)
  
              cmd = cmd.Remove(0, 6)
  
              cmd = cmd.Trim
  
              Dim proc As New Process
  
              With proc.StartInfo
  
                  .FileName = Path.Combine(Application.StartupPath, "ffmpeg.exe")
  
                  .Arguments = cmd
  
                  proc.EnableRaisingEvents = False
  
                  .UseShellExecute = False
  
                  .CreateNoWindow = True
  
                  .RedirectStandardError = True
  
                  .RedirectStandardOutput = True
  
                  .RedirectStandardInput = True
  
                  AddHandler proc.ErrorDataReceived, AddressOf UpdateData
  
                  proc.Start()
  
                  proc.BeginErrorReadLine()
  
              End With
  
          End Sub
  
  
  
          Public Sub Cancel()
  
              m.Abort()
  
          End Sub
  
  
  
          Private Sub UpdateData(ByVal sender As Object, ByVal e As DataReceivedEventArgs)
  
              Dim s As String = e.Data
  
              If s.Contains("Duration: ") Then
  
                  duration = GetDuration(s)
  
              ElseIf s.Contains("frame=") Then
  
                  current = GetTime(s)
  
              Else
  
                  Dim proc As Process = DirectCast(sender, Process)
  
                  Dim m As Match = Regex.Match(s, "^File\ '(.*?)'\ already\ exists", RegexOptions.IgnoreCase)
  
                  If m.Success Then
  
                      Dim w As StreamWriter = proc.StandardInput
  
                      If MessageBox.Show("File '" & m.Groups(1).ToString & "' already exists." & vbNewLine & "Do you want to Overwrite existing file?", "Overwrite", MessageBoxButtons.YesNo) = DialogResult.Yes Then
  
                          w.WriteLine("y")
  
                      Else
  
                          w.WriteLine("n")
  
                      End If
  
                  End If
  
  
  
                  'RaiseEvent ConvertFinish(_Item.ID)
  
                  'proc.WaitForExit()
  
                  'proc.Close()
  
              End If
  
              Debug.Print(s)
  
              If Not duration And Not current Then varIsSet = False Else varIsSet = True
  
          End Sub
  
  
  
          Private Function GetDuration(ByVal s As String) As Double
  
              Dim m As Match = Regex.Match(s, "Duration: ((.*?), (.*))")
  
              If m.Success Then
  
                  Dim duration As String = m.Groups(2).ToString
  
                  Return TimeSpan.Parse(duration).TotalSeconds
  
              End If
  
              Return Nothing
  
          End Function
  
  
  
          Private Function GetTime(ByVal s As String) As Double
  
              Dim m As Match = Regex.Match(s, "(.*) time=(.*) bitrate")
  
              If m.Success Then
  
                  Dim currentTime As String = m.Groups(2).ToString
  
                  Return TimeSpan.Parse(currentTime).TotalSeconds
  
              End If
  
              Return Nothing
  
          End Function
  
  
  
          Private Sub timer_Tick(ByVal sender As Object, ByVal e As System.EventArgs) Handles timer.Tick
  
              If varIsSet Then
  
                  Dim etr As TimeSpan = TimeSpan.FromSeconds(CInt(current / duration))
  
                  etr = New TimeSpan(etr.Hours, etr.Minutes, etr.Seconds)
  
                  RaiseEvent ProgressChange(_Item.ID, CInt((current / duration) * 100 * 100), etr)
  
              End If
  
          End Sub
  
      End Class

• Flutter | Retrieve ffprobe data

  23 juin 2021, par YourLogarithm

  I'm using flutter_ffmpeg package, specifically I'm trying to retrieve information regarding the chapter marks from a .m4b file which is an audiobook. By using this method :

  


  _flutterFFmpeg.executeWithArguments(['-i', widget.book.path, '-print_format', 'json', '-show_chapters', '-loglevel', 'error']);


  


  I was able to output this data as a JSON map in the console. The thing is, I need to use this data inside my application, is there a way to get access to those chapters as a variable using another approach, or maybe to access this data directly from the console log printed by the method shown earlier.