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• Node.js child_process TypeError : Cannot read property '_writableState' of undefined

  15 mai 2018, par functorial

  I am trying to wrap a piece of ffmpeg’s functionality in a Node.js API, using the child_process library, but when I attempt to send any data to ffmpeg’s stdin pipe, I get an error TypeError: Cannot read property '_writableState' of undefined.

  import {spawn} from "child_process"
  
  
  
  export default frames => {
  
      // Spawn ffmpeg process
  
      const ffmpeg = spawn("ffmpeg", ["-f", "image2pipe", "-i", "-", "output.mkv"])
  
      // Send frames to ffmpeg as stdin
  
      frames.forEach(ffmpeg.stdin.write)
  
  
  
      // Listen for output and errors
  
      return new Promise((resolve, reject) => {
  
          const chunks = []
  
  
  
          ffmpeg.stdout.on("data", chunks.push)
  
          ffmpeg.stderr.on("data", reject(data))
  
          ffmpeg.on("close", code =>
  
              resolve(Buffer.concat(chunks))
  
          )
  
      })
  
  }

  Error :

  TypeError: Cannot read property '_writableState' of undefined
  
      at Writable.write (_stream_writable.js:270:20)
  
      at Array.forEach (<anonymous>)
  
      at exports.default (/home/fiendfan1/workspace/nodejs/declare/dist/app/common/encodeVideo.js:21:12)
  
      at _callee$ (/home/fiendfan1/workspace/nodejs/declare/dist/app/tests/video.js:34:84)
  
      at tryCatch (/home/fiendfan1/workspace/nodejs/declare/node_modules/regenerator-runtime/runtime.js:65:40)
  
      at Generator.invoke [as _invoke] (/home/fiendfan1/workspace/nodejs/declare/node_modules/regenerator-runtime/runtime.js:303:22)
  
      at Generator.prototype.(anonymous function) [as next] (/home/fiendfan1/workspace/nodejs/declare/node_modules/regenerator-runtime/runtime.js:117:21)
  
      at Generator.tryCatcher (/home/fiendfan1/workspace/nodejs/declare/node_modules/bluebird/js/release/util.js:16:23)
  
      at PromiseSpawn._promiseFulfilled (/home/fiendfan1/workspace/nodejs/declare/node_modules/bluebird/js/release/generators.js:97:49)
  
      at Promise._settlePromise (/home/fiendfan1/workspace/nodejs/declare/node_modules/bluebird/js/release/promise.js:574:26)
  
      at Promise._settlePromise0 (/home/fiendfan1/workspace/nodejs/declare/node_modules/bluebird/js/release/promise.js:614:10)
  
      at Promise._settlePromises (/home/fiendfan1/workspace/nodejs/declare/node_modules/bluebird/js/release/promise.js:693:18)
  
      at Async._drainQueue (/home/fiendfan1/workspace/nodejs/declare/node_modules/bluebird/js/release/async.js:133:16)
  
      at Async._drainQueues (/home/fiendfan1/workspace/nodejs/declare/node_modules/bluebird/js/release/async.js:143:10)
  
      at Immediate.Async.drainQueues [as _onImmediate] (/home/fiendfan1/workspace/nodejs/declare/node_modules/bluebird/js/release/async.js:17:14)
  
      at runCallback (timers.js:696:18)
  
  </anonymous>

• Converting a call center recording to something useful

  9 août 2018, par Abhay

  I have a call center recording (when played it sounds gibberish) for which the mediainfo shows info as

  ion@aurora:~/Inbound$ mediainfo 48401-3405-48403--18042018170000.wav 
  
  General
  
  Complete name                            : 48401-3405-48403--18042018170000.wav
  
  Format                                   : Wave
  
  File size                                : 327 KiB
  
  Duration                                 : 4mn 11s
  
  Overall bit rate                         : 10.7 Kbps
  
  
  
  Audio
  
  Format                                   : G.723.1
  
  Codec ID                                 : A100
  
  Duration                                 : 4mn 11s
  
  Bit rate                                 : 10.7 Kbps
  
  Channel(s)                               : 2 channels
  
  Sampling rate                            : 8 000 Hz
  
  Stream size                              : 327 KiB (100%)

  The ffmpeg info shows this as

  ion@aurora:~/Inbound$ ffmpeg -i 48401-3405-48403--18042018170000.wav
  
  ffmpeg version N-91330-ga990184 Copyright (c) 2000-2018 the FFmpeg developers
  
    built with gcc 5.4.0 (Ubuntu 5.4.0-6ubuntu1~16.04.9) 20160609
  
    configuration: --prefix=/home/ion/ffmpeg_build --pkg-config-flags=--static --extra-cflags=-I/home/ion/ffmpeg_build/include --extra-ldflags=-L/home/ion/ffmpeg_build/lib --extra-libs='-lpthread -lm' --bindir=/home/ion/bin --enable-gpl --enable-libaom --enable-libass --enable-libfdk-aac --enable-libfreetype --enable-libmp3lame --enable-libopus --enable-libvorbis --enable-libvpx --enable-libx264 --enable-libx265 --enable-nonfree
  
    libavutil      56. 18.102 / 56. 18.102
  
    libavcodec     58. 20.103 / 58. 20.103
  
    libavformat    58. 17.100 / 58. 17.100
  
    libavdevice    58.  4.101 / 58.  4.101
  
    libavfilter     7. 25.100 /  7. 25.100
  
    libswscale      5.  2.100 /  5.  2.100
  
    libswresample   3.  2.100 /  3.  2.100
  
    libpostproc    55.  2.100 / 55.  2.100
  
  Input #0, wav, from '48401-3405-48403--18042018170000.wav':
  
    Duration: 00:04:11.37, bitrate: 10 kb/s
  
      Stream #0:0: Audio: g723_1 ([0][161][0][0] / 0xA100), 8000 Hz, mono, s16, 10 kb/s
  
  At least one output file must be specified

  So I converted this file to PCM using

  ffmpeg -acodec g723_1 -i 48401-3405-48403--18042018170000.wav -acodec pcm_s16le -f wav outnew1.wav

  But the audio still sound gibberish , I tried many variation and only Goldwave worked but that works on windows and with GUI not cli.

  So how can I convert this file to something useful so that atleast I can listen to it , It feels like a challenge now.

  Audio file : https://drive.google.com/open?id=1T54lKaI6IJmOqTPNOA_OkYRz89EQ5F2L

  PS : Use VLC to play audio file

• Fixing a corrupted .MP4 file. which might be a 3gp file

  2 juin 2020, par Tendekai Muchenje

  I have a file called input.MP4 and it is corrupted. It's from a CCTV camera. I tried everything, ffmpeg, VLC convert, no luck. However, I used mediainfo and exiftool and extracted the following info. I am wondering if someone can figure out if I can use any of this info to fix it or convert it to a usable format. I have a copy of it here on my Google Drive

  



  mediainfo gave me this :

  



  General
Complete name                       : input.MP4
Format                              : MPEG-4
Format profile                      : 3GPP Media Release 5
Codec ID                            : 3gp5 (3gp5/3gp4/avc1/mp42/isom)
File size                           : 5.77 MiB
IsTruncated                         : Yes


  



  exiftool gave me this :

  



  ExifTool Version Number          : 10.80
File Name                        : input.MP4
Directory                        : /home/tendi/Downloads
File Size                        : 5.8 MB
File Modification Date/Time      : 2018:07:21 19:09:03-04:00
File Access Date/Time            : 2018:07:21 19:30:48-04:00
File Inode Change Date/Time      : 2018:07:21 19:30:48-04:00
File Permissions                 : rw-rw-r--
File Type                        : 3GP
File Type Extension              : 3gp
MIME Type                        : video/3gpp
Major Brand                      : 3GPP Media (.3GP) Release 5
Minor Version                    : 0.0.0
Compatible Brands                : 3gp5, 3gp4, avc1, mp42, isom
Movie Data Size                  : 5899106
Movie Data Offset                : 44


  



  Any suggestions ?