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• Set GOP length for HEVC-Encoding in ffmpeg

  18 juin 2018, par nm82

  I want to encode an xxx.y4m file to hevc and set the GOP-length to a particular value, open and closed gop.

  To encode I’m using :

  ...>ffmpeg -i xxx.y4m -c copy xxx.hevc

  this gives me the hevc-encoded file, now I want to set a particular gop-length

  ...>ffmpeg -i xxx.y4m -c:v libx265 -keyint=1 -open-gop=1 -c copy xxx.hevc

  is not working because "option not found"

  kind regards

• ffmpeg : video from images - handling a zero length image file

  29 septembre 2021, par Buadhai

  I have a shell script which uses ffmpeg to crate a time-lapse video from webcam images. Normally, it works just fine :

  


  /usr/bin/ffmpeg -loglevel info  -framerate 4 \
     -pattern_type glob -i $ipath/'*.jpg' \
    -c:v libx264 -crf 30 -y -pix_fmt yuv420p $temp &>>$log


  


  But this chokes if the image is a zero-length file :

  


  -rw-r--r-- 1 pi pi  156636 Sep 29 04:35 image_022.jpg
-rw-r--r-- 1 pi pi  156533 Sep 29 04:35 image_023.jpg
-rw-r--r-- 1 pi pi  159302 Sep 29 04:35 image_024.jpg
-rw-r--r-- 1 pi pi       0 Sep 29 04:35 image_025.jpg
-rw-r--r-- 1 pi pi  157055 Sep 29 04:35 image_026.jpg
-rw-r--r-- 1 pi pi  156851 Sep 29 04:35 image_027.jpg
-rw-r--r-- 1 pi pi  155793 Sep 29 04:35 image_028.jpg
-rw-r--r-- 1 pi pi  160647 Sep 29 04:35 image_029.jpg


  


  In this case the video only included frames up to the zero length JPEG.

  


  I realize I can test the file length of every webcam image, but there must be an easier, more efficient way.

  


  Is there ?

  


• NodeJS + FFMPEG -sending response when FFMPEG is completed

  2 février 2015, par eco_bach

  I have a working NodeJS+FFMPEG application. I am able to upload video files and have them converted on the server. I am using this NodeJS FFMPEG library
  https://github.com/fluent-ffmpeg/node-fluent-ffmpeg

  I get a message on the server when the job is complete, but how do I notify the client ?? In this case a simple AIR application. Right now I can only ’hear’ the initial response after a successful upload.

  The initial video file was uploaded via a http POST request.

  My primary node application without the dependencies is as follows

  var ffmpeg =  require('./lib/fluent-ffmpeg');
  
  
  
  var express = require('express'),
  
      multer  = require('multer');
  
  var app = express();
  
  
  
  //auto save file to uploads folder
  
  app.use(multer({ dest: './uploads/'}))
  
  
  
  var temp;
  
  
  
  app.post('/', function (req, res) {
  
      console.log(req.body); //contains the variables
  
      console.log("req.files ="+ req.files); //contains the file references
  
  
  
  console.log("req.files.Filedata.path ="+ req.files.Filedata.path ); 
  
  
  
  temp=req.files.Filedata.path;
  
  // make sure you set the correct path to your video file
  
  var proc = ffmpeg('./'+temp)
  
    // set video bitrate
  
    .videoBitrate(1024)
  
    // set audio codec
  
    .audioCodec('libmp3lame')    
  
    // set output format to force
  
    .format('avi')
  
  
  
  
  
    // setup event handlers
  
    .on('end', function() {
  
     console.log('file has been converted succesfully');    
  
    })
  
    .on('error', function(err) {
  
      console.log('an error happened: ' + err.message);
  
    })
  
  
  
  
  
    // save to file
  
    .save('./converted/converted.avi');
  
      res.send('Thank you for uploading!');
  
  
  
  });
  
  
  
  app.listen(8080);