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• [FFmpeg on Windows] : help me converting a set of .png files to a video file

  31 octobre 2016, par Stefano Fedele

  Hi everybody I am on windows 10, I installed FFMpeg and I would like to use it to convert 100 .png image files into a video file.

  I am using it via the prompt, which is the Windows console, and I am struggling with the syntax (which probability comes from Linux). I set the folder in which ffmpeg.exe is contained as a windows system path as suggested on many websites and I moved the prompt to the folders in which the image files are contained which is reported here :

  cd C:\video\pnts + ag 40 nm- during-tmpyp 10-12- laser power 7mw- kinetic100- exposure time 1s- gain

  I would like to convert the image files contained in this folder into a video file, the names of those image files are reported here :

  pnts + ag 40 nm- during-tmpyp 10-12- laser power 7mw- kinetic100- exposure time 1s- gain 20 001.png

  pnts + ag 40 nm- during-tmpyp 10-12- laser power 7mw- kinetic100- exposure time 1s- gain 20 002.png

  ...

  ...

  pnts + ag 40 nm- during-tmpyp 10-12- laser power 7mw- kinetic100- exposure time 1s- gain 20 100.png

  The number of frames per second whould be 2.

  I read on internet that I should have to type something like this

  ffmpeg -i image-%03d.png video.webm

  But it looks like there are a lot of variables to consider and all the times I try to set them and run FFmpeg I get an error from the prompt.
  Is there anyone who could suggest me the proper syntax, please ?

• How to convert jquery animation to movie or gif format ?

  19 avril 2019, par Barış Demirdelen

  How to convert jquery animation to movie or gif format ?
  Animation and screenshot functions call or too slow.
  Help me please

  Animation Function

  function resim1(){
  
      $("#resim-1").animate({ left: leftx}, startEffectTime1);
  
      ......
  
  }

  ScreenShot Function but too slow

  function shot(){
  
            html2canvas($("#main"), {
  
                onrendered: function(canvas) {
  
                    theCanvas = canvas;
  
                    document.body.appendChild(canvas);
  
                    Canvas2Image.saveAsPNG(canvas); 
  
                    $("#img-out").append(canvas);
  
                }
  
            });
  
  }

  Call animation and screenshot functions

  $(document).ready(function() {
  
       resim1(); // Animate start
  
       setInterval(function(){ // Screenshot start
  
            shot();
  
       },500);
  
  
  
  });

  Bottom function call animation breaking :/

  $(document).ready(function() {
  
       resim1(); // Animate start
  
       setInterval(function(){ // Screenshot start
  
            shot();
  
       },500);
  
  
  
  });

• Conversion of individual mp4 files to ts yields unexpected playback

  3 août 2021, par MorenoGentili

  I'm converting three mp4 files (h264, no audio, each with a duration of three seconds) to the mpeg-ts format like so.

  


  ffmpeg -i 1.mp4 -c copy 1.ts
ffmpeg -i 2.mp4 -c copy 2.ts
ffmpeg -i 3.mp4 -c copy 3.ts


  


  Please note : I can't combine the mp4 files beforehand. Each one has to be converted individually as shown above since they're being generated by a live recorder.

  


  Then, I manually created a .m3u8 manifest like this one, so I could play those 3 ts files in sequence :

  


  #EXTM3U
#EXT-X-VERSION:3
#EXT-X-MEDIA-SEQUENCE:0
#EXT-X-PLAYLIST-TYPE:VOD
#EXT-X-TARGETDURATION:3
#EXTINF:3,
1.ts
#EXTINF:3,
2.ts
#EXTINF:3,
3.ts
#EXT-X-ENDLIST


  


  When I run the ffplay index.m3u8 command :

  


  

  • 1.ts is played for three seconds as expected ;

  


  • 2.ts is played "for a split second" (maybe just a frame) ;

  


  • 3.ts is played for three seconds as expected.

  


  


  Can someone explain why 2.ts is shown for such a brief time ? When I run ffmpeg -i 2.ts, the output is correctly displaying a duration of three seconds.

  


  Input #0, mpegts, from '2.ts':
  Duration: 00:00:03.00, start: 1.480000, bitrate: 49 kb/s


  


  How can I change my mp4 -> ts conversion commands so that each file can play for their whole duration (i.e. three seconds each) ? I'd like to avoid reencoding if possible.

  


  Thank you, I'm adding a link to the three files and the manifest for completeness.