Wasin Raktham

Hello, I'm beginner for JMF. I tried to write a java class to create a image to review video file.

I found a code from internet but it doesn't work for me. Because When I run the code, it show me..

Fobs4JMF - Native shared library found
635.088First Position: 0, 80 Duration: 635088
Frame Rate: 25
Opening Thread[JMF thread: com.sun.media.PlaybackEngine@f5da06[ com.sun.media.PlaybackEngine@f5da06 ] ( configureThread),9,system]
Fobs Java2DRenderer: setInputFormat
Fobs Java2DRenderer: setInputFormat
FobsVideoTrack: mapTimeToFrame
FobsVideoTrack: mapFrameToTime
Exception in thread "main" java.lang.NullPointerException
at com.user.vidtojpg.VideoUtility.getImageOfCurrentFrame(VideoUtility.java:66)
at com.user.vidtojpg.VideoUtility.getAllImages(VideoUtility.java:94)
at com.user.vidtojpg.VideoUtility.getAllImages(VideoUtility.java:105)
at com.user.vidtojpg.VideoUtility.main(VideoUtility.java:113)

What about Exception in thread "main" java.lang.NullPointerException? and How I fix it.

Then my code is :

package com.user.vidtojpg; import java.awt.Image; import java.io.File; import java.io.FileNotFoundException; import java.io.IOException; import java.util.ArrayList; import javax.media.Buffer; import javax.media.Manager; import javax.media.MediaLocator; import javax.media.NoPlayerException; import javax.media.Player; import javax.media.Time; import javax.media.control.FrameGrabbingControl; import javax.media.control.FramePositioningControl; import javax.media.format.VideoFormat; import javax.media.util.BufferToImage; public class VideoUtility{ @SuppressWarnings("deprecation") /** * videoFile - path to the video File. */ public static Player getPlayer(String videoFile) throws NoPlayerException, IOException{ File f = new File(videoFile); if (!f.exists()) throw new FileNotFoundException("File doesnt exist"); MediaLocator ml = new MediaLocator(f.toURL()); Player player = Manager.createPlayer(ml); player.realize(); while (player.getState() != Player.Realized); return player; } public static float getFrameRate(Player player){ return (float)noOfFrames(player)/(float)player.getDuration().getSeconds(); } public static int noOfFrames(Player player){ FramePositioningControl fpc = (FramePositioningControl)player.getControl("javax.media.control.FramePositioningControl"); Time duration = player.getDuration(); int i = fpc.mapTimeToFrame(duration); if (i != FramePositioningControl.FRAME_UNKNOWN) return i; else return -1; } /**@param player - the player from which you want to get the image * @param frameNumber - the framenumber you want to extract * @return Image at the current frame position * */ public static Image getImageOfCurrentFrame(Player player, int frameNumber){ System.out.println("getImageOfCurrentFrame() called"); FramePositioningControl fpc = (FramePositioningControl) player .getControl("javax.media.control.FramePositioningControl"); FrameGrabbingControl fgc = (FrameGrabbingControl) player .getControl("javax.media.control.FrameGrabbingControl"); return getImageOfCurrentFrame(fpc, fgc, frameNumber); } public static Image getImageOfCurrentFrame(FramePositioningControl fpc, FrameGrabbingControl fgc, int frameNumber){ fpc.seek(frameNumber); Buffer frameBuffer = fgc.grabFrame(); BufferToImage bti = new BufferToImage((VideoFormat) frameBuffer .getFormat()); return bti.createImage(frameBuffer); } public static FramePositioningControl getFPC(Player player){ FramePositioningControl fpc = (FramePositioningControl) player .getControl("javax.media.control.FramePositioningControl"); return fpc; } public static FrameGrabbingControl getFGC(Player player){ FrameGrabbingControl fgc = (FrameGrabbingControl) player .getControl("javax.media.control.FrameGrabbingControl"); return fgc; } public static ArrayList<Image> getAllImages(Player player){ ArrayList<Image> imageSeq = new ArrayList<Image>(); int numberOfFrames = noOfFrames(player); FramePositioningControl fpc = getFPC(player); FrameGrabbingControl fgc = getFGC(player); for (int i = 0;i <= numberOfFrames;i++){ Image img = getImageOfCurrentFrame(fpc, fgc, i); if(img!=null) imageSeq.add(img); } return imageSeq; } public static ArrayList<Image> getAllImages(String fileName) throws NoPlayerException,IOException{ Player player = getPlayer(fileName); ArrayList<Image> img = getAllImages(player); player.close(); return img; } public static void main(String[] args) throws NoPlayerException, IOException{ getAllImages("C:/temp/barcelona.avi"); } }

Hi!!

I have any problem to your help.

I need a java class to get an image from .mp4 file.

I try to read about JMF. But I confuse about it.

I need to get an example of image from .mp4. For example I need a first frame, 100th frame, 200 frame from video.

How do I writa a code.

Thanks.

How to convert movie file to an image files or screenshot using java.

Have a java API?

How to convert PDF file to an image files using java.

Have any Java API?

David Newton wrote:What specific issue are you having?

When I compile it shown me access denied <<all files>> execute

Bear Bibeault wrote:Where is "C:\"? On the server, or on the client? If the former, simply use normal Java file I/O. If the latter, you can't do that.

To get a file from the client to the server, you'll need to have the user upload the file. See the JSP FAQ for information on creating upload capability.

Drive C:\ on server.

Hello, I'm new Java.

I need to write a code to read a folder in C:\ from server side.

I tried to read about java.policy. But I don't understand about it.

Please explain me how to fix this problem.

Thank you!!

ujjwal soni wrote:Hi,

Check that your path has read write execute permission.

How can i check it?

My friends tell me to look java.policy but it's not work.

Hello,

I'm new java user.

I try to code a program to execute cmd.exe via GWT(google web toolkit)

I code

Process p = Runtime.getRuntime().exec(cmd);

in server side and run it.

So, it show me

access denied (java.io.FilePermission c:\Myfile.txt read)

How i fix it.

Please help me.