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• Accord.Video.FFMPEG getting error for long video

  30 novembre 2022, par wahyu

  I use Accord.Video.FFMPEG to extract images every 10 frames from a video. Total frames for this video is 38194 frames. First run is good, I can save image every 10 frames but after run of about 38185 frames i got null return from this code Bitmap bmpBaseOriginal = vReader.ReadVideoFrame();, if I see in the video there is no problem at the end of video.

  


  I do something like this

  


  using (var vReader = new VideoFileReader())
{
    vReader.Open(files[0]);
    TotalFrame = vReader.FrameCount;
    countin = Convert.ToInt32(TotalFrame / Convert.ToDouble(countAsset));
    Fps = vReader.FrameRate.Value;                                
    int a = 0;
    for (int i = 0; i < vReader.FrameCount; i++)
    {
         if(i < vReader.FrameCount - 1)
         {
              Bitmap bmpBaseOriginal = vReader.ReadVideoFrame();
              if (i%10 == 0)
              {
                  a++;
                  bmpBaseOriginal.Save(string.Format("{0}\\{1}.jpeg", dirVideo.FullName, a), ImageFormat.Jpeg);
              }
              bmpBaseOriginal.Dispose();
         }
         else
         {
              a++;
              Bitmap bmpBaseOriginal = vReader.ReadVideoFrame();
              bmpBaseOriginal.Save(string.Format("{0}\\{1}.jpeg", dirVideo.FullName, a), ImageFormat.Jpeg);
              bmpBaseOriginal.Dispose();
         }
    }
    vReader.Close();
}


  


  this problem occurs again on another video if the video has a lot of frames, but no problem if the video has a less frames.

  


  How to solve it ?

  


• FFmpeg for automatic video generation from images ?

  22 janvier 2018, par Dionisis K

  I want to implement an automatic video generation from images, like facebook’s anniversary video. And I would also like to add some filters. I’ve been searching a lot and read FFmpeg’s documentation which is pretty amazing.

  In the future I want to have 10-20 "bashscripts" with different filters leading to different themes (e.g. fade-in, zoom, overlay images, left-to-right, etc..)

  So my biggest concern is having an interface which offers readable code and provides scalability. Since ffmpeg is a bashscript i searched for a wrapper

  There are wrappers in

  • https://github.com/PHP-FFMpeg/PHP-FFMpeg for php ,which doesn’t support image convertion to videos and complex filters .
  • https://github.com/fluent-ffmpeg/node-fluent-ffmpeg which looks promising but also difficult to go with complex filters
  • and https://github.com/kkroening/ffmpeg-python for python.I think that it s pretty good

  Are there any other wrappers worth to check ?
  Would you recommend something from the above ?
  Is there any pros and cons using a specific programming language for this particular case ?
  Is there anything else i should bear in mind before I make a decision ?

• Add a fixed size image on a video, regardless of the video width & height FFMPEG [duplicate]

  30 juillet 2017, par Rita

  This question already has an answer here :

  • FFMPEG : Add a fixed size image on a video, regardless of the video width & height (resolution)
    
    1 answer
    

  This is my code that that is use is following

  $info = pathinfo($file) ;
  $out = "$info[’dirname’]/ss_$info[’basename’]" ;
  exec("ffmpeg -i ’".$file."’ -i ’".SS_ROOT."".$ss->settings[’watermark_image’]."’ -filter_complex ’overlay=main_w-overlay_w-10:main_h-overlay_h-10’ ’".$out."’") ; 

  that works very well, but it doesn’t keep the logo aspect ratio. I tried this code on two videos with different resolution and this is the result