www in docker support

decompiled-libs/www/acxent-videoj-1.0.0/it/acxent/videoj/ManageVideoJ.java

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+package it.acxent.videoj;
+
+import java.awt.image.BufferedImage;
+import java.io.File;
+import java.util.LinkedHashSet;
+import javax.imageio.ImageIO;
+import org.jcodec.api.FrameGrab;
+import org.jcodec.common.io.NIOUtils;
+import org.jcodec.common.model.Picture;
+
+public class ManageVideoJ {
+  public static final LinkedHashSet<String> extractNFrames(String videoFileName, String targetDir, String targetName, int nFrames) throws Exception {
+    Timer timer = new Timer();
+    timer.start();
+    FrameGrab g = FrameGrab.createFrameGrab(NIOUtils.readableChannel(new File(videoFileName)));
+    LinkedHashSet<String> frames = new LinkedHashSet<>();
+    BufferedImage bufferedImage = null;
+    Picture picture = null;
+    try {
+      File targetDirFile = new File(targetDir);
+      if (!targetDirFile.exists())
+        targetDirFile.mkdirs(); 
+      int movieLen = g.getVideoTrack().getMeta().getTotalFrames();
+      int step = movieLen / (nFrames + 1);
+      System.out.println("len:" + movieLen + " step: " + step);
+      for (int i = 0; i < nFrames; i++) {
+        g.seekToFrameSloppy(i * step);
+        picture = g.getNativeFrame();
+        bufferedImage = AWTUtil.toBufferedImage(picture);
+        String currentFile = targetDir + targetDir + "_" + targetName + ".jpg";
+        frames.add(currentFile);
+        File frameFile = new File(currentFile);
+        ImageIO.write(bufferedImage, "jpg", frameFile);
+        bufferedImage.flush();
+        bufferedImage = null;
+        picture = null;
+      } 
+    } finally {
+      if (bufferedImage != null) {
+        bufferedImage.flush();
+        bufferedImage = null;
+      } 
+      if (g != null) {
+        g.getDecoder().shutdownThreadPool();
+        g = null;
+      } 
+    } 
+    timer.stop();
+    System.out.println("extractNFrames. DURATA: " + timer.getDurataHourMin());
+    return frames;
+  }
+}