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Is there a way to take a bunch of images and turn them into an mp4 file in java?

I am currentrly working on a Way to visualize Fractals in Java. The mathematics behind it work perfectly fine and I am very happy with how the Pics turn out. Now i want to take these Images and turn them into a Video. I've written a Java Program that produces any number of Pictures and saves them (alphabetically) in a new directory. Now I need a way for Java to convert these Images into a Video.
I know there are solutions such as ffmpeg, however I need this process to be repeatable, so I don't think a Command Line Application would be the best Option.
Is there any Way to implement such a function into Java directly ?

If you're willing to use a third party library and the platform is supported (Windows or Linux, 64bit). You can use Pilecv4j (Full disclosure, I'm the main committer).
There's a test checked in that does exactly this. You can find it here: TestSplitIntoFiles.java
Here is the pertinent function that does this with the minor difference that it's not reading the image file names from the contents on the disk:
private static void encodeFiles(final File imageDir, final long numFrames, final File outputVideo) throws IOException {
try(final CvMat firstFrame = ImageFile.readMatFromFile(new File(imageDir, "image-0.jpg").getAbsolutePath());
final EncodingContext ectx = Ffmpeg2.createEncoder()
.outputStream(outputVideo.getAbsolutePath())
.openVideoEncoder("libx264", "vidEncoder")
.addCodecOptions("preset", "slow")
.addCodecOptions("crf", "40")
.enable(firstFrame, false)
;) {
final VideoEncoder ve = ectx.getVideoEncoder("vidEncoder");
ectx.ready();
LongStream.range(0, numFrames)
.mapToObj(fn -> new File(imageDir, "image-" + fn + ".jpg").getAbsolutePath())
.forEach(frameFile -> {
try(CvMat mat = uncheck(() -> ImageFile.readMatFromFile(frameFile));) {
ve.encode(mat, false);
}
});
}
}
If you decide to give it a try, let me know if you run into any issues. You can use the Issues on GitHub. I've been using it professionally for a while.
Also, see the answer to this question: Read a mp4 and write to anther mp4 creates bigger size

Why does my Image not load in this path, but in another?

I Tried putting an image onto a JButton. After wrote down the path to the image, ran the Program,then image was not on the Button. Code Sample below:
public static JButton start = new JButton(new ImageIcon("resources//img//menu//Start_Game.png"));
The "resources" folder is in the "src" folder. Here is the Hirarchy in Eclipse
After I double checked I spelled everything right, I put in an other path.
public static JButton start = new JButton(new ImageIcon(System.getProperty("user.home") + "//Tindir//Hauptmenue//Start_Game.png"));
Suddenly it worked. It is obvious that the first path was not correct.
Question If there is a way to input a path to an Image in the same Project-Folder as the Code?

Yes, but not that way - those arguments are filenames, and java code is not deployed as a sack of files. It's deployed as a jar file. An entry inside a jar file does not count and can never be used with this API.
So, don't use this call. Use the other one, that takes a URL, because you certainly can represent either a file, or an entry within a jarfile, as one of those:
MyClass.class.getResource("Start_Game.png")
That is what you put instead of "resources/etc/Start_Game.png" in that code. This looks for a resource named Start_Game.png in the exact same place that MyApp.class is found, even if that is found inside a jar file, loaded out of a DB, live-streamed from the internet - whatever. You're using the same mechanism.
If your Start-Game file is somewhere else, start with a /. It seems like you want /img/menu/Start_Game.png here.
This trick is an easy way to get an idea of what you're doing:
class MyClass {
public static void main(String[] args) {
System.out.println(MyClass.class.getResource("MyClass.class"));
}
}
and you'll figure it out with that output.

java BufferdImage dosen´t load

So right now I´m trying to load an Image on my Harddrive in a BufferdImage in my Code. Yet I think I did everything right but my trycatch only leaves the catch.
Code for better understanding :
private static BufferedImage image;
public void initPictures() {
try {
image = ImageIO.read(new File("Pictures/blue.png"));
} catch (IOException ex) {
System.out.println("Will not load");
ex.printStackTrace();
}
}
The initPictures() is called in my Constructor of the Class. And you can see here that my picture that I try to load is in the E:\Dropbox\Dropbox\Java Projekte\FallingBlocks1\build\classes\Pictures folder on my OS. So the "Pictures/blue.png" should be good.
Windows Folder Picture:
So my Qustion here is : What am I missing?
EDIT : added ex.printStackTrace(); nothing changed thought.
EDIT : also tried to load other pictures int the "image", with no other results

There are two possibilities:
1. Your program may not be running in the folder that contains the "Pictures" folder.
To find out where your program is running, do a System.out.println(System.getProperty("user.dir")); to see what folder you're running in. If it prints something other than E:\Dropbox\Dropbox\Java Projekte\FallingBlocks1\build\classes, you know it's an issue with the path you're providing to ImageIO.read(file). For kicks, you may also want to see what new File("Pictures/blue.png").isFile() is returning.
2. Your image might not readable.
If you try the first test out and you know for certain that the path you are providing is correct, then it's likely that your image file is either corrupt or cannot be read (could be caused by access restrictions, connectivity problems, hardware issues, etc.). Try pointing to a different image and see what happens.

Referencing Pictures from resource folder in a Jar

I can't help it but think I've missed just the Thread to answer my question but I've been looking for a long time now and can't seem to find the help I need.
My problem is quite simple:
I've created a game (or rather I'm in the process of it) and I'm trying to add sprites (png files for the enemies and such) to it. Loading them in the IDE works just fine but when I create a jar file and try to open it, it simply says "A Java Exception has occurred". Further investigation revealed the problem is that it can't find the files I told it to load.
Through the threads I've read I gathered this much:
It's either that I'm not loading the images properly, meaning that I don't use the proper code for it, or
my MANIFEST.mf does not contain a "Class-Path" (meaning that the arguments are blank, which in fact they are)
Finding other code didn't work out for me. People suggested to use a ClassLoader which I could't manage to get working. Trying it out gave me nullpointer exceptions.
Trying to look into the latter didn't do much help, because I couldn't find any helping information, or I'm just not understanding anything.
package platformer.resources;
import java.awt.geom.AffineTransform;
import java.awt.image.AffineTransformOp;
import java.awt.image.BufferedImage;
import java.io.*;
import javax.imageio.*;
public class ImageLoader
{
static String spritePath = "src/platformer/resources/";
public static BufferedImage loadImage(String path)
{
BufferedImage img = null;
try{img= ImageIO.read(new File(spritePath+path));
}catch(IOException e){System.out.println("Couldn't load File: "+spritePath+path);}
return img;
}
public static BufferedImage flipImage(BufferedImage bufferedImage)
{
AffineTransform tx = AffineTransform.getScaleInstance(-1, 1);
tx.translate(-bufferedImage.getWidth(null), 0);
AffineTransformOp op = new AffineTransformOp(tx,
AffineTransformOp.TYPE_NEAREST_NEIGHBOR);
bufferedImage = op.filter(bufferedImage, null);
return bufferedImage;
}
}
This is the code I used so far.
Other classes would use "loadImage" or "flipImage" and in the IDE it works fine but as a .jar it fails to find the .png.
For example the class "platformer/entities/walker.class" would try to open the "Idle.png". In order to do that it uses the "loadImage("/entities/enemy/walker/Idle.png")" method. Note that in the method the actual path would end up being "src/platformer/resources/entities/enemy/walker/Idle.png".
Again, I'm terribly sorry if this has already been answered but I appreciate your help nonetheless.
Michael

When your files are inside a jar they can only be taken out as a resource stream so you will want to use something like:
ImageLoader.class.getResourceAsStream("nameoffile").
This is because a jar is actually a zipped up directory structure and files are not really files they are hidden amongst a compressed zip formatting as binary.

Loading image from source folder returned as null

Hello I have a problem with importing an image from my resources folder. I have looked all over google (or so I think) and I have no idea what I am doing wrong.
All help is appreciated thanks
Here is the picture of my java project:
Here is my Game Code:
public Game(){
handler = new Handler();
this.addKeyListener(new KeyInput(handler));
new Window(WIDTH, HEIGHT, "Testing", this);
BufferedImageLoader loader = new BufferedImageLoader();
level = loader.loadImage("/level.png");
hud = new HUD();
spawn = new Spawn(handler, hud);
r = new Random();
walls = new WallsMap(handler);
cam = new Camera(0, 0);
walls.render();
handler.addObject(new Player(WIDTH/2-32, HEIGHT/2-32, ID.Player, handler));
}
Finally here is my BufferedImageLoader class:
public class BufferedImageLoader {
private BufferedImage image;
public BufferedImage loadImage(String path){
try {
image = ImageIO.read(getClass().getClassLoader().getResourceAsStream(path));
} catch (IOException e) {
e.printStackTrace();
}
return image;
}
}

To solve your particular problem, either of these two options should work so that the resource can be properly located:
Remove the call to getClassLoader() from your loadImage method so that the call is just getClass().getResourceAsStream(path) -OR-
Remove the slash from "/level.png" so that your call to loadImage looks like loader.loadImage("level.png")
However, in general, I agree with mastercork889, that it is better practice to organize your resources into packages as well.
EDIT:
In response to mastercork889's comment saying that my answer should be AND instead of OR, I thought I should elaborate on why it is indeed exclusive OR. I would have just commented, but I'm still too new to stack overflow to be allowed to comment, and this is quite a bit of information anyway :)
Removing the call to getClassLoader() works because then you're using the getResourceAsStream() method from the Class class, which does extra work before delegation to the getResourceAsStream() method from the ClassLoader class.
From the Java API:
Before delegation, an absolute resource name is constructed from the given resource name using this algorithm:
If the name begins with a '/' ('\u002f'), then the absolute name of the resource is the portion of the name following the '/'.
Since your resource isn't in a package, and is at the top level of a source folder (it looks like res is an "Eclipse Source Folder"), the level.png portion following the slash will adequately identify the location of the resource in an absolute way.
OR
Removing the slash from "/level.png" also works because then when the object's class loader (which should be the system class loader) looks for the resource, it will attempt to resolve your resource in an absolute way. The special handling of the slash at the beginning is behavior that is specific to the getResourceAsStream() method in Class, not ClassLoader.
The reason that AND won't work, is because if you call the getResourceAsStream() method from Class and remove the slash, then it will attempt to locate the resource in the same package that the associated class is located in. If you choose to go with the AND option, then you would need to move level.png into the com.plat.gfx package.
As a final point, I have built a small test program that followed the same format as your example, and once I followed one of the two suggestions, it worked for me.
The subtleties of resources, classes, and class loaders can be quite tricky. Good luck with your project!

Don't worry about putting images in a specific folder. Instead put them also in the src folder under a specific package: com.plat.res
I find that putting images in a specific package makes the package hierarchy look much more efficient, and less spaghetti-like.
Also a note on package conventions: domain-extension.domain.main-program.etc. My package hierarchy looks like this:
com.brennytizer.jumg
com.brennytizer.jumg.res
com.brennytizer.jumg.engine
com.brennytizer.jumg.level
com.brennytizer.jumg.level.maps
If you don't have a domain, write in what you think your domain would be (if you were to buy it in the future), or just use your (backwards) name:
My name is Jarod Brennfleck, writing program foobar, my package would be: brennfleck.jarod.foobar.
Once in there use the ImageIO class: ImageIO.read(Game.class.getResourceAsStream("/com/plat/res/leve.png"));