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• fluent-ffmpeg generating incorrect framerate

  25 novembre 2013, par ZakThompson

  I'm having a strange issue converting images to a video. I am using the excellent fluent-ffmpeg module for a node.js server. I have 179 jpg images which I wish to convert to a 30fps video (should be about 6s). I have successfully done so using the following ffmpeg command :

  ffmpeg -r 30 -i frame%03d.jpg -c:v libx264 out.mp4

  This outputs the following when inspected by ffmpeg :

  ffmpeg -i out.mp4
  
  
  
  Input #0, mov,mp4,m4a,3gp,3g2,mj2, from 'out.mp4':
  
    Metadata:
  
      major_brand     : isom
  
      minor_version   : 512
  
      compatible_brands: isomiso2avc1mp41
  
      encoder         : Lavf54.63.104
  
    Duration: 00:00:06.00, start: 0.000000, bitrate: 1631 kb/s
  
      Stream #0:0(und): Video: h264 (High) (avc1 / 0x31637661), yuvj420p, 640x480 [SAR 1:1 DAR 4:3], 1627 kb/s, 30 fps, 30 tbr, 15360 tbn, 60 tbc
  
      Metadata:
  
         handler_name    : VideoHandler

  Now, I am attempting to do the same thing with fluent-ffmpeg :

  var proc = new ffmpeg({ source: 'frame%03d.jpg', nolog: true })
  
    .addOptions(['-c:v libx264','-r 30'])
  
    .saveToFile('test.mp4', function(retcode, error){
  
      console.log('file has been converted succesfully');
  
    });

  Should be exactly the same, right ? But here is what I'm getting :

  ffmpeg -i test.mp4
  
  
  
  Input #0, mov,mp4,m4a,3gp,3g2,mj2, from 'test.mp4':
  
    Metadata:
  
      major_brand     : isom
  
      minor_version   : 512
  
      compatible_brands: isomiso2avc1mp41
  
      encoder         : Lavf54.63.104
  
    Duration: 00:00:07.20, start: 0.000000, bitrate: 1556 kb/s
  
      Stream #0:0(und): Video: h264 (High) (avc1 / 0x31637661), yuvj420p, 640x480 [SAR 1:1 DAR 4:3], 1553 kb/s, 30 fps, 30 tbr, 15360 tbn, 60 tbc
  
      Metadata:
  
        handler_name    : VideoHandler

  Now what's most interesting here is that although both were made from the same set of images and both supposedly have the same frame rate, the one made with fluent-ffmpeg has a duration of 7.20s, a full 1.20 longer than the first one. Upon comparing the two videos, it seems the fluent-ffmpeg one is actually at 25fps even though it reports 30.

  Note that I have tried properly adding the two flags using the methods (.withVideoCodec, .withFps) with the same result, I merely resorted to adding the arguments manually in an attempt to make it exactly the same as my original command.

  If anybody here has experience with this module and/or has any suggestions, it would be greatly appreciated !

• Add a timestamp overlay using ffmpeg by Node Js

  20 septembre 2015, par Nazmul Hossain Bilash

  I am working on video editing. Currently I want to add time stamp on a video. I have found some command line code from a website. But how can I add this by Node Js FFMPEG module.

  ffmpeg -f dshow -i video="HD Pro Webcam C920" -vf "drawtext=fontfile=arial.ttf:text='%m';fontcolor=white@0.8:x=7:y=460" -vcodec libx264 -vb 2000k -preset ultrafast -f mp4 output.mp4

  Some notes : arial.tff lives in the same directory as ffmpeg

  Here is the website link.

• Revision 0451c6b6dd : Refactor per block rate distortion estimate Move the rate-distortion estimate f

  22 avril 2015, par Jingning Han

  Changed Paths :
   Modify /vp9/encoder/vp9_rdopt.c

  
  
  Refactor per block rate distortion estimate

  Move the rate-distortion estimate function outside the recursion
  as an individual operating module.

  Change-Id : I662199223c256664bcd312084b3aebffb8a8034b