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• How to access uploaded file from multer ?

  13 avril 2017, par Somename

  Im able to upload an image to S3. Now, if the file selected is .gif, I want to be able to convert the .gif file to .mp4 and upload the converted file to S3. I am able to convert a .gif to .mp4 with ffmpeg only if I give the path of the file. How do I access the uploaded file from Multer ? Below is my code :

  var express = require('express');
  
  var bodyParser = require('body-parser');
  
  var app = express();
  
  var aws = require('aws-sdk');
  
  var multer = require('multer');
  
  var multerS3 = require('multer-s3');
  
  var s3 = new aws.S3();
  
  var ffmpeg = require('fluent-ffmpeg');
  
  
  
  
  
  var upload = multer({
  
      storage: multerS3({
  
          s3: s3,
  
          bucket: 'myBucket',
  
          key: function (req, file, cb) {
  
              console.log(file);
  
              var extension = file.originalname.substring(file.originalname.lastIndexOf('.')+1).toLowerCase();
  
  
  
                  if(extension=="gif"){
  
                  console.log("Uploaded a .gif file");
  
  
  
                  ffmpeg(file) //THIS IS NOT WORKING
  
                      .setFfmpegPath("C:\\ffmpeg\\bin\\ffmpeg.exe")
  
                        .output('./outputs/2.mp4')    //TRYING TO UPLOAD LOCALLY, WHICH FAILS
  
                        .on('end', function() {
  
                          console.log('Finished processing');
  
                        })
  
                        .run();
  
              }
  
  
  
              cb(null, filename);
  
          }
  
      })
  
  });

  I’m trying to access the uploaded file like this : ffmpeg(file) since file is an argument passed in the multer function.

  My form :

  <form action="/upload" method="post" enctype="multipart/form-data">
  
      <input type="file" /> <br />
  
      <input type="submit" value="Upload" />
  
  </form>

  In which part of the process do I convert the file ?

  Please help. Many thanks.

• FFmpeg not closing output file

  2 février 2016, par peugas

  I’m using FFmpeg to write video frames to a file.

  So far I’m able to create an output file, grab my frames from a camera, encode the frames, write them and close the output file.

  Everything works great except that I need to close my program for the output file to be available to be played. Closing the file is not enough.

  If I don’t close my program the output file shows as a 0KB file.

  This is my output file closing code :

  if (outContext)
  
  {
  
      int ret = av_write_frame(outContext, NULL);
  
      ret = av_write_trailer(outContext);
  
      if (outContext->pb)
  
      {
  
          av_freep(&outContext->pb->buffer);
  
          av_freep(&outContext->pb);
  
          avio_close(outContext->pb);
  
      }
  
      avformat_free_context(outContext);
  
  }

  Am I forgetting to free/close anything ?

• Segment Broadcast WAVE file with FFMPEG

  4 octobre 2018, par yekootmada

  I have a Broadcast WAV file that is duration 4 hours with a timecode track starting at 00:00:00 and ending at 04:00:00 (obviously).

  I need to extract a section of the file, for example from 01:45:00 to 03:55:00 whilst maintaining the original timecode data for that section of the file.

  When i run this FFMPEG script, I get the correction section of the file in "out.wav", however the start timecode of the file is always 00:00:00, and not 01:45:00 as you would expect.

  Here is my current code :

  ffmpeg -ss 01:45:00 -i in.wav -to 03:55:00 -c copy -write_bext 1 out.wav

  How do you tell ffmpeg to take the timecode data from the section of the file and not copy it from the beginning ?

  Thanks a lot, hope that is clear.