Develop Reference

using FFmpeg for android without any C/C++ or make knowledge

I would like to use FFmpeg library on my android app.
I have no C/C++/Make knowledge and all the threads I've been reading about it talk about stuff I completely don't understand.
Is there any pre-compiled library which I can add to my project, then add a simple 'import' statement on my java class and then call it?
Thanks

Is there any particular reason why you need exactly FFmpeg? I guess it could be possible to get prebuilt binaries, but since it is a C library, you would also need a JNI wrapper code - I don't think anyone would generate that for the whole library since it's quite large, so even with a prebuilt library you still need to have some JNI knowledge to wire through the communication between Java and FFmpeg in C. Just for the purpose of demonstration - here is an example.
Apart from that if there is not a special reason to use FFmpeg, why can't you stick with MediaCodec that is a part of the Android API? It wraps the native StageFright library and could provide hardware support on devices where it is available, while FFmpeg would be a CPU only solution. Of course, if some unpopular codecs or muxers that are not available in MediaCodec are needed, then FFmpeg is the way.

You can use Xuggler for encoding and decoding audio and video. Their wesite says "Xuggler extensively uses FFmpeg to compress and uncompress media".

You could use precompiled libs from the JavaCPP Presets along with FFmpegFrameRecorder from JavaCV to compress images as well as audio samples, as shown in the RecordActivity sample, for example.

java synthesizer that can use dls or sf2 files

I am looking for a synthesizer that I can use with javax.sound.midi classes which allows me to use soundbank formats other than one by Beatnik. I could not find one and a 6 years old information tells me that there are none available. However I wonder if new projects have come up since.
I have asked a related question with a different approach to playing my own samples according to a midi sequence generated by a sequencer in java, but to no avail.

In Java 7 sf2-soundbanks can be loaded via the class SF2Soundbank which worked fine.

Try the high quality one offered at Java Sound API: Soundbanks.

1-D barcode scanner(using images from a capturing device) implementation in java

I am a student and as a project i have to implement a barcode(1-D) based attendance marking system.While surfing across the web i came to know that barcode readers are a bit costly toys to purchase,so now what I want to do is I want to capture images of barcodes through a capturing device(mostly a webcam) and then process them to get the content stored in it.
I found a few projects on the internet that do the same but they use .NET f/w and I am not so familiar with .NET technology. The only project that uses java is http://sourceforge.net/projects/javabarcoderead/ but somehow i am not able to run the jar file they are providing.
SO, I would like to know about the algorithms or methods that can be used for the same or even any project from where i can get some insight on how to move further with this...
Happy Coding...

You're right, it would be very difficult to use a library with no documentation and no source code.
I'd suggest using ZXing. It's a well-documented library with lots of examples.

What is the platform independent sound format in java

I am working on a chat application in java. My program need to play sounds at regular interval as the message arrives. What are the sound format should I choose to play on (Windows/Linux/MacOS) platforms, without using external liberaries

Sound-formats are all platform independent. The question is: Is there a Codec on the target platform which supports this format.
If you're developing a chat-application i guess you won't use high quality audio things, so Sun Audio-files should work for you. Check out this older post on how to use them.

For some reason .ao seems to be the lowest common denominator for Java, while .wav seems to be used almost everywhere else for notification-sounds (or possibly even .ogg or .mp3).

Image Processing via Standalone application

I'm developing a project for doing Content Based Image Retrieval where front end will be in java.
The main issue is about choosing tool for performing image processing. Since Matlab provides a lot of functionality for doing CBIR. But the main problem about using Matlab is that you need to have Matlab installed on every computer using the application.
Is there any other way in which I can do my project (Using other tools or driver) so that my application will run without using any other tools ???
Or can I develop entire application in Matlab only and deploy it as a standalone application ???
Thank you..

There are plenty of image processing libraries, for example for Java: ImageJ, there is also one by the Apache Commons project. If you need higher-level computer vision libraries there is OpenCV for C++ that also has bindings for Java, for example.
You can also develop the entire application in Matlab, but to deploy a stand alone application requires this requires licensing Mathworks Builder NE (which can be expensive). Matlab is very good for research and prototyping purposes.
There are other alternatives that are amenable to quick prototyping for example Python and PIL.
I think the bottom line is that there are plenty of options.

Java image utilities library: A Java library for loading, editing, analyzing and saving pixel image files.
It supports various file formats.
Provides demo applications for the command line. It has AWT GUI toolkit too.

Matlab is an excellent tool for prototyping as already pointed out by carlosdc. Matlab offers limited options with regard to UI programming. GUIDE is ok for small projects, but hinders more than it helps on bigger ones.
With MATLAB Builder JA you're able to compile your Matlab code into Java classes.
With regard to plotting time series in real time, libraries like JFreeChart are way slower.

I think OpenCV is one of the best libraries out there for image processing but Java Advanced Imaging is also quite good but doesn't has as much features and examples. Color similarity would be simple in JAI but shape probably would involve more code.
If you choose to use OpenCV I think you have at least two possible binding implementations for Java. The one my group uses is this one. It has some Processing dependencies.
Regardless of what library you choose be prepared for some frustration. Matlab users are used to all the nice features it provides and when they have to port their code to other languages end having to write a lot more code.

Well, after a long search finally I've found the way to deploy Matlab code along with java that too standalone application..
The steps are simple::--
1. Go and get Javabuilder.jar file located at location::
Matlab\toolbox\javabuilder\jar\javabuilder.jar
Next type deploytool in Matlabs command line...
deploytool window will open now create a new java project.
Select Matlab files that you want to use.
The deploytool will now convert the .m file to .jar file.
Now use both of the above mentioned jar files and develop your java compatible matlab code
and thats the way you can create the standalone application of matlab..