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• Using AFORGE to record the videos in c#

  11 octobre 2015, par Muhammad Nauman

  i’ve try the following way to record the video from the Webcam by 25 Frame-rate per sec for 10sec but when i get the out put video it is of 2sec and the frames are played to fast as compare to the video stream.

  The code is as follows.

      using System;
  
  using System.Drawing;
  
  using System.Windows.Forms;
  
  using AForge.Video;
  
  using AForge.Video.DirectShow;
  
  using System.Threading;
  
  using AForge.Video.FFMPEG;
  
  
  
  namespace AforgeTutorial
  
  {
  
      public partial class Form1 : Form
  
      {
  
          private FilterInfoCollection ListOfCams;
  
          private VideoCaptureDevice SelectedCam; //From where we will take image
  
          System.Timers.Timer tim;
  
  
  
          Thread t;
  
          bool isNewFrame = false;
  
          VideoFileWriter writer;
  
  
  
          public Form1()
  
          {
  
              InitializeComponent();
  
              tim = new System.Timers.Timer(10000);
  
              tim.Elapsed += new System.Timers.ElapsedEventHandler(tim_Elapsed);
  
              t = new Thread(saveVideo);
  
          }
  
  
  
          void tim_Elapsed(object sender, System.Timers.ElapsedEventArgs e)
  
          {
  
              if (isRecord)
  
              {
  
                  writer.Close();
  
                  isRecord = false;
  
              }
  
          }
  
  
  
          private void Form1_Load(object sender, EventArgs e)
  
          {
  
              ListOfCams = new FilterInfoCollection(FilterCategory.VideoInputDevice);
  
  
  
              if (ListOfCams.Count == 0)
  
                  return;
  
  
  
              comboBox1.Items.Clear();
  
              foreach (FilterInfo Cam in ListOfCams)
  
              {
  
                  comboBox1.Items.Add(Cam.Name);
  
              }
  
          }
  
  
  
          private void StopCamera()
  
          {
  
              SelectedCam.SignalToStop();
  
              SelectedCam.Stop();
  
          }
  
  
  
          bool isRecord = false;
  
  
  
          private void Start_Click(object sender, EventArgs e)
  
          {
  
              if (comboBox1.Text == string.Empty)
  
                  return;
  
  
  
              SelectedCam = new VideoCaptureDevice(ListOfCams[comboBox1.SelectedIndex].MonikerString);
  
  
  
              SelectedCam.NewFrame += new NewFrameEventHandler(SelectedCam_NewFrame);
  
              SelectedCam.Start();
  
          }
  
  
  
          Bitmap image;
  
          void SelectedCam_NewFrame(object sender, NewFrameEventArgs eventArgs)
  
          {
  
              image = (Bitmap)eventArgs.Frame.Clone();
  
              isNewFrame = true;
  
              pictureBox1.Image = (Bitmap)eventArgs.Frame.Clone();            
  
          }
  
  
  
          private void Form1_FormClosing(object sender, FormClosingEventArgs e)
  
          {
  
              StopCamera();
  
          }
  
  
  
          private void Stop_Click(object sender, EventArgs e)
  
          {
  
              StopCamera();
  
          }
  
  
  
          private void btnRecord_Click(object sender, EventArgs e)
  
          {
  
              tim.Start();
  
  
  
              if (!isRecord)
  
              {
  
                  writer = new VideoFileWriter();
  
                  writer.Open(@"C:/code-bude_test_video.mp4", 640, 480, 25, VideoCodec.MPEG4,10000);
  
              }
  
  
  
              isRecord = !isRecord;
  
              if (isRecord)
  
                  t.Start();
  
          }
  
  
  
          void saveVideo()
  
          {
  
              while (isRecord)
  
              {
  
                  if (isNewFrame)
  
                  {
  
                      writer.WriteVideoFrame(image);
  
                      isNewFrame = false;
  
                  }
  
              }
  
          }
  
      }
  
  }

• ENOENT Error in Node When Calling Ffmpeg binary from Fluent-Ffmpeg Api

  7 novembre 2018, par Peter

  Background

  I am wiring up a firebase function in node. Purpose is to parse an inbound audio clip to a set length. Using ffmpeg and fluent-ffmpeg.

  Problem

  When the function is triggered in firebase, I am getting ENOENT error when Fluent-Ffmpeg attempts to access the Ffmpeg binary

  Firebase Debug Output

  Error : Error : spawn
  ./Cloud/functions/node_modules/ffmpeg-binaries/bin/ffmpeg ENOENT
  at exports._errnoException (util.js:1018:11)
  at Process.ChildProcess._handle.onexit (internal/child_process.js:193:32)
  at onErrorNT (internal/child_process.js:367:16)
  at _combinedTickCallback (internal/process/next_tick.js:80:11)
  at process._tickDomainCallback (internal/process/next_tick.js:128:9) code : ’ENOENT’, errno :
  ’ENOENT’, syscall : ’spawn
  ./Cloud/functions/node_modules/ffmpeg-binaries/bin/ffmpeg’, path :
  ’./Cloud/functions/node_modules/ffmpeg-binaries/bin/ffmpeg’,
  spawnargs : [ ’-formats’ ]

  Expected Outcome

  Inbound file is downloaded to a temp directory, cropped, and re-uploaded to firebase storage as the cropped file.

  Environment

  • mac client / firebase storage
  • node v8.1.0
  • ffmpeg v3.2.2
  • fluent-ffmpeg v2.1.2

  Code [Updated To Reflect Svenskunganka’s Change. Now Works]

  const ffmpeg = require('fluent-ffmpeg');
  
  const PREVIEW_PREFIX = 'preview_';
  
  
  
  exports.generatePreviewClip = functions.storage.object('audioFiles').onChange(event => {
  
  
  
        //console.log('Times this function has run: ', run++);
  
  
  
        const object = event.data; // The Storage object.
  
        const fileBucket = object.bucket; // The Storage bucket that contains the file.
  
        const filePath = object.name; // File path in the bucket.
  
        const contentType = object.contentType; // File content type.
  
        const resourceState = object.resourceState; // The resourceState is 'exists' or 'not_exists' (for file/folder deletions).
  
        const metageneration = object.metageneration; // Number of times metadata has been generated. New objects have a value of 1.
  
  
  
        // Exit if this is triggered on a file that is not an audio file.
  
        if (!contentType.startsWith('audio/')) {
  
          console.log('This is not an audio file.');
  
          console.log('This is the file:', filePath);
  
          return;
  
        }
  
  
  
        // Get the file name.
  
        const fileName = path.basename(filePath);
  
        console.log('Working with filename', fileName);
  
        // Exit if the file is already an audio clip.
  
        if (fileName.startsWith(PREVIEW_PREFIX)) {
  
          console.log('Already a preview clip.');
  
          return;
  
        }
  
  
  
        // Exit if this is a move or deletion event.
  
        if (event.data.resourceState === 'not_exists') {
  
          console.log('This is a deletion event.');
  
          return;
  
        }
  
  
  
        // Exit if file exists but is not new and is only being triggered
  
        // because of a metadata change.
  
        if (resourceState === 'exists' && metageneration > 1) {
  
          console.log('This is a metadata change event.');
  
          return;
  
        }
  
  
  
        // Download file from bucket.
  
  
  
        const bucket = gcs.bucket(fileBucket);
  
        const tempFilePath = path.join(os.tmpdir(), fileName);
  
        return bucket.file(filePath).download({
  
          destination: tempFilePath
  
        }).then(() => {
  
  
  
          console.log('Audio file downloaded locally to temp directory', tempFilePath);
  
  
  
      var ffmpegPath = require("ffmpeg-binaries").ffmpegPath();
  
      var ffprobePath = require("ffmpeg-binaries").ffprobePath();
  
  
  
      // Generate a croped file using ffmpeg.
  
      var command = new ffmpeg(tempFilePath);
  
          command.setFfmpegPath(ffmpegPath);
  
          command.setFfprobePath(ffprobePath);
  
  
  
          command
  
                .setStartTime('00:00:03')
  
                .setDuration('10')
  
                .output(tempFilePath)
  
                .on('end', function() {
  
                      console.log('Audio Crop Done Successfully');
  
                 })
  
                 .on('error', function(err)
  
                 {
  
                    console.log('Error:', err);
  
                 }).run();
  
  
  
                }).then(() => {
  
          console.log('Preview file created at', tempFilePath);
  
          // We add a 'preview_' prefix to the audio file name. that's how it will appear in firebase.
  
          const previewFileName = PREVIEW_PREFIX + fileName;
  
          console.log('previewFileName is', previewFileName)
  
          const previewFilePath = path.join(path.dirname(filePath), previewFileName);
  
          console.log('previewFilePath is', previewFilePath);
  
          // Uploading the preview file.
  
          return bucket.upload(tempFilePath, {destination: previewFilePath});
  
        // Once the file has been uploaded delete the local file to free up disk space.
  
        }).then(() => fs.unlinkSync(tempFilePath));
  
  
  
        // [END audio file generation]
  
  
  
      });

  Contents and Structure of my ffmpeg-binaries/bin Directory

  -rwxrwxrwx  1 sherpa  staff    24M Dec 10  2016 ffmpeg
  
  -rwxr--r--  1 sherpa  staff    35M Jan 12  2017 ffmpeg.exe
  
  -rwxr--r--  1 sherpa  staff    35M Jan 12  2017 ffplay.exe
  
  -rwxrwxrwx  1 sherpa  staff    24M Dec 10  2016 ffprobe
  
  -rwxr--r--  1 sherpa  staff    35M Jan 12  2017 ffprobe.exe
  
  -rwxrwxrwx  1 sherpa  staff    22M Dec 10  2016 ffserver

  Things I Have Tried

  • I can execute ffmpeg from the command line
  • sudo chmod -R u+x ffmpeg-binaries/
  • ffmpeg set in global path
  • used ffmpeg.exe binary in setFfmpegPath, got same result
    • Error : Error : spawn ./Cloud/functions/node_modules/ffmpeg-binaries/bin/ffmpeg.exe ENOENT
  • played with numerous different setFfmpegPath path structures, e.g :
    • ./Cloud/functions/node_modules/ffmpeg-binaries/bin/ffmpeg
    • node_modules/ffmpeg-binaries/bin/ffmpeg
    • ./Cloud/functions/node_modules/ffmpeg-binaries/bin/

  Thanks for any suggestions.

• Matplotlib animation MovieWriters fails on Ubuntu 12.04

  13 février 2013, par jjwebster

  I am attempting to save matplotlib animations to a movie via ffmpeg on Ubuntu 12.04 LTS (32-bit Desktop). Following the matplotlib example, it fails to load the animation writer : AttributeError: 'module' object has no attribute 'writers' (line 15 of the example) :

  import numpy as np
  
  import matplotlib
  
  matplotlib.use("Agg")
  
  import matplotlib.pyplot as plt
  
  import matplotlib.animation as animation
  
  
  
  def update_line(num, data, line):
  
      line.set_data(data[...,:num])
  
      return line,
  
  
  
  # Set up formatting for the movie files
  
  Writer = animation.writers['ffmpeg']

  Via apt-get, I've tried installing ffmpeg, every codec imaginable, and even tried to compile ffmpeg from source. Nothing works.

  How do I get matplotlib to talk to ffmpeg on Ubuntu ?