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• NodeJS/ffmpeg : Can't create screenshot of stream file

  11 septembre 2017, par user3142695

  I need to create a screenshot via ffmpeg (node-fluent-ffmpeg : https://github.com/fluent-ffmpeg/node-fluent-ffmpeg) of a stream, as my data is stored in a gridFS.

  This is how I’m doing that with a local file - and it works so far

  ffmpeg('/Users/Anybody/Downloads/1test.mp4')
  
    .on('error', (error) => {
  
      console.error(error)
  
    })
  
    .on('end', () => {
  
      console.log('Screenshots taken')
  
    })
  
    .screenshots({
  
      folder: '/Users/Anybody/Downloads/',
  
      timestamps: ['00:01.000']
  
    })

  But if I change the code to use a stream (gridfs-stream), no file is created, although the output gives me a successful message :

  import Grid from 'gridfs-stream'
  
  
  
  const gfs = Grid(
  
    MongoInternals.defaultRemoteCollectionDriver().mongo.db,
  
    MongoInternals.NpmModule
  
  )
  
  
  
  ffmpeg(gfs.createReadStream({ _id: sourceId }))
  
    .on('filenames', (filenames) => {
  
      console.log('Will generate ' + filenames.join(', '))
  
    })
  
    .on('codecData', (data) => {
  
      console.log('Input is ' + data.audio + ' audio ' + 'with ' + data.video + ' video')
  
    })
  
    .on('error', (error) => {
  
      console.error(error)
  
    })
  
    .on('end', () => {
  
      console.log('Screenshots taken')
  
    })
  
    .screenshots({
  
      folder: '/Users/Anybody/Downloads/',
  
      timestamps: ['00:01.000']
  
    })

  Output

  Will generate tn.png
  
  Input is aac (mp4a / 0x6134706D) audio with h264 (avc1 / 0x31637661) video
  
  Screenshots taken

• Reading file metadata in nodejs with ffmetadata and fs returns undefined

  10 novembre 2020, par Citanaf

  I cant seem to get this right. I am attempting to read a file's metadata (title) with ffmetadata via a loop on the folder using fs. I would then like to push those properties into an object array called files. If I place the push method inside the ffmetadata, it throws a "push is not a function" error. If I place the push method outside ffmetadata, but inside readdirSync, the object gets created, but the titles are undefined.

  


  I think I'm running into a asynchronous issue or a variable scope issue ? I've place several Console.logs over this and the return from the metadata returns after code that comes well after this section.

  


  Any help is appreciated.

  


  var path = './AudioFiles/'
var files = [];
var fTitle

//Read list of files
fs.readdirSync(path).forEach((file) => {
    ffmetadata.read(path + file, function(err, data){
        if (err) console.error("Error reading metadata", err);
        else {
            fTitle = data.title
        }
    })
    files.push({name:file.replace('.mp3',''),title:fTitle})
})


  


  This is what I am receiving :

  


  files = [{name:"myFile1",title:undefined},{name:"myFile2",title:undefined}...]


  


  I am expecting the below results :

  


  files = [{name:"myFile1",title:"myFile1Title"},{name:"myFile2",title:"myFile2Title"}...]


  


• Save a partial video file locally using NodeJS

  25 octobre 2017, par Sami

  I have a serverless web application that is deployed on AWS and I have to take a screenshot from an uploaded video to S3. I am using ffmpeg to extract the screenshot but the only drawback is that I have to download the video file first in order to let ffmpeg work with it.
  Knowing the fact I am using AWS Lambda and I don’t have limits for video length users might upload large files which makes AWS Lambda to hit the storage limit.
  To overcome this I thought of downloading a small chunk of the video and use it with ffmpeg to extract the thumbnail so using the S3.getOjbect method with range params I was able to download a chunk of the file but ffmpeg couldn’t understand it.
  Here is my code :

  s3.getObject({
  
    Bucket: bucketName,
  
    Key: key,
  
    Range: 'bytes=0-1048576'
  
  }, (err, data) => {
  
    fs.writeFile(fileName, data.Body, error => {
  
      if (error)
  
        console.log(error)
  
      else
  
        console.log('File saved');
  
    })
  
  })

  And the code to extract the thumbnail :

  const ffmpeg = require('fluent-ffmpeg');
  
  new ffmpeg(fileName).screenshots({
  
    timestamps: [0],
  
    filename: 'thumb.png',
  
    folder: '.'
  
  })

  And I am getting this error from ffmpeg

  Error: ffmpeg exited with code 1: ./test.mp4: Invalid data found when processing input

  I know there is a problem in saving the file like this but I couldn’t find any solution that solves my problem. If anybody has one that would be much appreciated.

  UPDATE :
  It turns out that ffmpeg does this for me, I just gave it the url and it downloaded what it needs to render the screenshot without the need to download the file locally and the code looks like this :

  const ffmpeg = require('fluent-ffmpeg');
  
  new ffmpeg(url).screenshots({
  
    timestamps: [0],
  
    filename: 'thumb.png',
  
    folder: '.'
  
  })