Technique to generate thumbnails from a lot of videos

beginners
#1

Hi all

Does anyone know a good technique to generate thumbnails from a lot of videos?

In my head I was thinking

  • Load a video
  • Skip a few frames forward in time
  • Output the thumbnail image
  • Repeat for the next video

Too me this seems very inefficient. Do you know a better way?

Cheers
Az

OF 0.8, VS2012

#2

anyone?

#3

hi,
that is quite straight forwards indeed. Obviously if it is done by hand it would be very inefficient, but you can code it all with just a few lines.
it should be something like this

string videosFolder = "the_folder_where_your_video_files_are";
ofDirectory dir;
dir.allowExt("mov");//change this to use different files. Duplicate this line to add more filetypes.
dir.listDir(videosFolder);
ofVideoPlayer tmp;
for(int i =0; i < dir.size(); i++){
string videoPath = dir.getPath(i);
tmp.loadMovie(videoPath);
tmp.play();
tmp.setPosition(0.1);
img.setFromPixels( tmp.getPixelsRef() );
float thumbWidth = 120;//change this for another thumb size
img.resize(thumbWidth, thumbWidth * (img.getHeight() / img.getWidth()) );
img.saveImage("thumbs/"+ofFilePath::getBaseName(videoPath) + ".jpg");
}

best.

#4

cheers