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• How do i get an universally readable video from ffmpeg ?

  3 décembre 2015, par Francesco Scotti

  I tried to make a video out of several images with ffmpeg but what i got didn’ work at all or on quicktime only.
  The command i’m using is :

  ffmpeg -r 1 -f concat -i input.txt -vcodec libx264 -crf 25 -pix_fmt yuv420p test.mp4

  where my input.txt is this file :

  file 'P1020222.JPG'
  
  file 'P1020234.JPG'
  
  file 'P1020240.JPG'
  
  file 'P1020248.JPG'

  This is just a try, my final goal is to create a video that follows the speech of a person. So the list of frames (images) can’t just be "every picture of that folder". Let’s just say that php will create the "input.txt" with the sequence needed to create the video.

  The video i get is 4 seconds long (i set 1fps), 1 second for each of the 4 images. But only quicktime can read it. I followed this tutorial : http://hamelot.co.uk/visualization/using-ffmpeg-to-convert-a-set-of-images-into-a-video/.

  Please help me to find a command line that will output a video readable on every player and every device. Format is not important.

  Thanks

• Is there a way to work with fluent-ffmpeg library for audio encoding (webm to wav/mp3) in Angular 2+ ?

  24 avril 2019, par binarysynthesis

  So i’m using Browser media objects to record audio using microphone for speech to text transcription. The recorded media gives me a blob/file which is in webm format. I want to convert the blob/file to wav or mp3 format which will be sent to AWS S3 Storage from where i intend to use the AWS Transcribe (Speech to Text) service to pick up the file and produce a transcript of the speech. AWS Transcribe doesn’t support webm format due to which i need to encode the audio on the client side to either wav or mp3. I’m trying to use the fluent-ffmpeg (third-party) [https://www.npmjs.com/package/fluent-ffmpeg] npm library to accomplish that but i keep getting the following error in the Typescript compiler when building using ng serve. I have already tried using the RecorderJS and the WebAudioRecoderJS npm libraries and i get the same ’Module not found’ error. -

  ERROR in ./node_modules/fluent-ffmpeg/index.js
  
  Module not found: Error: Can't resolve './lib-cov/fluent-ffmpeg' in 'C:\Users\banshuman\Desktop\AWS-Transcribe-Angular\aws-transcribe-angular\node_modules\fluent-ffmpeg'
  
  ERROR in ./node_modules/fluent-ffmpeg/lib/ffprobe.js
  
  Module not found: Error: Can't resolve 'child_process' in 'C:\Users\banshuman\Desktop\AWS-Transcribe-Angular\aws-transcribe-angular\node_modules\fluent-ffmpeg\lib'
  
  ERROR in ./node_modules/fluent-ffmpeg/lib/processor.js
  
  Module not found: Error: Can't resolve 'child_process' in 'C:\Users\banshuman\Desktop\AWS-Transcribe-Angular\aws-transcribe-angular\node_modules\fluent-ffmpeg\lib'
  
  ERROR in ./node_modules/fluent-ffmpeg/lib/utils.js
  
  Module not found: Error: Can't resolve 'child_process' in 'C:\Users\banshuman\Desktop\AWS-Transcribe-Angular\aws-transcribe-angular\node_modules\fluent-ffmpeg\lib'
  
  ERROR in ./node_modules/fluent-ffmpeg/lib/recipes.js
  
  Module not found: Error: Can't resolve 'fs' in 'C:\Users\banshuman\Desktop\AWS-Transcribe-Angular\aws-transcribe-angular\node_modules\fluent-ffmpeg\lib'
  
  ERROR in ./node_modules/fluent-ffmpeg/lib/capabilities.js
  
  Module not found: Error: Can't resolve 'fs' in 'C:\Users\banshuman\Desktop\AWS-Transcribe-Angular\aws-transcribe-angular\node_modules\fluent-ffmpeg\lib'
  
  ERROR in ./node_modules/fluent-ffmpeg/lib/processor.js
  
  Module not found: Error: Can't resolve 'fs' in 'C:\Users\banshuman\Desktop\AWS-Transcribe-Angular\aws-transcribe-angular\node_modules\fluent-ffmpeg\lib'
  
  ERROR in ./node_modules/isexe/index.js
  
  Module not found: Error: Can't resolve 'fs' in 'C:\Users\banshuman\Desktop\AWS-Transcribe-Angular\aws-transcribe-angular\node_modules\isexe'
  
  ERROR in ./node_modules/isexe/windows.js
  
  Module not found: Error: Can't resolve 'fs' in 'C:\Users\banshuman\Desktop\AWS-Transcribe-Angular\aws-transcribe-angular\node_modules\isexe'
  
  ERROR in ./node_modules/isexe/mode.js
  
  Module not found: Error: Can't resolve 'fs' in 'C:\Users\banshuman\Desktop\AWS-Transcribe-Angular\aws-transcribe-angular\node_modules\isexe'
  
  ERROR in ./node_modules/fluent-ffmpeg/lib/utils.js
  
  Module not found: Error: Can't resolve 'os' in 'C:\Users\banshuman\Desktop\AWS-Transcribe-Angular\aws-transcribe-angular\node_modules\fluent-ffmpeg\lib'
  
  ERROR in ./node_modules/fluent-ffmpeg/lib/recipes.js
  
  Module not found: Error: Can't resolve 'path' in 'C:\Users\banshuman\Desktop\AWS-Transcribe-Angular\aws-transcribe-angular\node_modules\fluent-ffmpeg\lib'
  
  ERROR in ./node_modules/fluent-ffmpeg/lib/fluent-ffmpeg.js
  
  Module not found: Error: Can't resolve 'path' in 'C:\Users\banshuman\Desktop\AWS-Transcribe-Angular\aws-transcribe-angular\node_modules\fluent-ffmpeg\lib'
  
  ERROR in ./node_modules/fluent-ffmpeg/lib/capabilities.js
  
  Module not found: Error: Can't resolve 'path' in 'C:\Users\banshuman\Desktop\AWS-Transcribe-Angular\aws-transcribe-angular\node_modules\fluent-ffmpeg\lib'
  
  ERROR in ./node_modules/fluent-ffmpeg/lib/processor.js
  
  Module not found: Error: Can't resolve 'path' in 'C:\Users\banshuman\Desktop\AWS-Transcribe-Angular\aws-transcribe-angular\node_modules\fluent-ffmpeg\lib'
  
  ERROR in ./node_modules/fluent-ffmpeg/lib/options/misc.js
  
  Module not found: Error: Can't resolve 'path' in 'C:\Users\banshuman\Desktop\AWS-Transcribe-Angular\aws-transcribe-angular\node_modules\fluent-ffmpeg\lib\options'
  
  ERROR in ./node_modules/which/which.js
  
  Module not found: Error: Can't resolve 'path' in 'C:\Users\banshuman\Desktop\AWS-Transcribe-Angular\aws-transcribe-angular\node_modules\which'
  
  ERROR in ./node_modules/fluent-ffmpeg/lib/recipes.js
  
  Module not found: Error: Can't resolve 'stream' in 'C:\Users\banshuman\Desktop\AWS-Transcribe-Angular\aws-transcribe-angular\node_modules\fluent-ffmpeg\lib'
  
  i ｢wdm｣: Failed to compile.

  I am using Angular 7.2.0 and TypeScript 3.2.4.
  I have also installed the type definitions for fluent-ffmpeg [https://www.npmjs.com/package/@types/fluent-ffmpeg] within the node_modules to specify the typings for TypeScript.
  Below is my angular component file where i have implemented the audio recording functionality in the Browser -

  /// <reference types="@types/dom-mediacapture-record"></reference>
  
  import { Component } from '@angular/core';
  
  import * as aws from 'aws-sdk';
  
  import * as TranscribeService from 'aws-sdk/clients/transcribeservice';
  
  import * as Ffmpeg from 'fluent-ffmpeg';
  
  
  
  @Component({
  
    selector: 'app-root',
  
    templateUrl: './app.component.html',
  
    styleUrls: ['./app.component.css']
  
  })
  
  export class AppComponent {
  
  
  
    speechToText() {
  
  
  
      console.log(Ffmpeg);     
  
  
  
      // Begin streaming audio
  
      navigator.mediaDevices.getUserMedia({ audio: true })
  
        .then(stream => {
  
          const mediaRecorder = new MediaRecorder(stream);
  
          // Start recording audio
  
          mediaRecorder.start();
  
  
  
          const audioChunks = [];
  
          // When recording starts
  
          mediaRecorder.addEventListener("dataavailable", event => {
  
            audioChunks.push((<any>event).data);
  
          });
  
  
  
  
  
          // When recording stops
  
          mediaRecorder.addEventListener("stop", () => {
  
            const audioBlob = new Blob(audioChunks, { type: 'audio/webm;codecs=opus' });
  
            const audioFile = new File([audioBlob], 'outputAudioFile');
  
            const audioUrl = URL.createObjectURL(audioBlob);
  
  
  
  </any>

  I’m not posting the entire component code as the rest is part of the AWS SDK and is irrelevant to the problem statement. I need to convert the audioBlob or the audioFile which are currently in the webm format to wav or mp3 for uploading to the AWS services. How can i achieve that in Angular using the ffmpeg library ? I’m open to other solutions as well and not just ffmpeg to get the job done on the client side.

• Detect bad frames in OpenCV 2.4.9

  14 mai 2014, par user3630380

  I know the title is a bit vague but I’m not sure how else to describe it.

  CentOS with ffmpeg + OpenCV 2.4.9. I’m working on a simple motion detection system which uses a stream from an IP camera (h264).

  Once in a while the stream hiccups and throws in a "bad frame" (see pic-bad.png link below). The problem is, these frames vary largely from the previous frames and causes a "motion" event to get triggered even though no actual motion occured.

  The pictures below will explain the problem.

  Good frame (motion captured) :

  

  Bad frame (no motion, just a broken frame) :

  

  The bad frame gets caught randomly. I guess I can make a bad frame detector by analyzing (looping) through the pixels going down from a certain position to see if they are all the same, but I’m wondering if there is any other, more efficient, "by the book" approach to detecting these types of bad frames and just skipping over them.

  Thank You !

  EDIT UPDATE :

  The frame is grabbed using a C++ motion detection program via cvQueryFrame(camera); so I do not directly interface with ffmpeg, OpenCV does it on the backend. I’m using the latest version of ffmpeg compiled from git source. All of the libraries are also up to date (h264, etc, all downloaded and compiled yesterday). The data is coming from an RTSP stream (ffserver). I’ve tested over multiple cameras (dahua 1 - 3 MP models) and the frame glitch is pretty persistent across all of them, although it doesn’t happen continuously, just once on a while (ex : once every 10 minutes).