I need to create steganographic videos (videos with data hidden in them) for my project.
I need to carry this out by extracting all the frames from a video and then hiding data in the selected frames by replacing bits in the LSB of the pixel color value and then encoding all the frames to create a new video(note here that lossless formats are required otherwise I might end up losing hidden data).
My research motivated me to use xuggler for manipulating videos, 'png' format to save the extracted images as it is a lossless format(handling them as BufferedImage objects), and using 'avi' video files.
As of now I am able to extract all frames from a video and encode my hidden data in the lsb's.
But I am having problems in creating the new avi video file using xuggler. When I extract the frames from the new video they lose the hidden data. I don't understand how to get this right and keep the data intact. This could be due to some lossy compression technique being used to create the new video.The size of the new video does not matter to me. I also can't find the correct codec_id to create the new video. I am extensively using xuggler tutorial available on wiki.
decode and capture frames http://build.xuggle.com/view/Stable/job/xuggler_jdk5_stable/ws/workingcopy/src/com/xuggle/mediatool/demos/DecodeAndCaptureFrames.java
I can post my code as required...
The problem is in the algorithm you are using , as mpeg or other famous video compression techniques are lossy compression techniques you will be losing data when you convert the frames back to video stream . So in lossy video codecs you cannot use LSB techniques for steganography .
Instead what you can do is change the motion vectors of the videos in someway to hide steganographic data . The problem in this is that xuggler being a higher level api might not give you a way to find/alter the motion vectors of the p/b frame . ffmpeg which xuggler uses does have a option for you to visualize the motion vectors so your best bet for motion vectors algo is alter the source code of ffmpeg as its a open-source project . Do reply back if you find a better way to find motion vectors .
Well , there is a simpler video steganography method
You can refer to Real steganography with truecrypt
But if you really want to go with mpeg video compression you can refer to the wonderful
paper : Steganography in Compressed Video Stream but the problem still remains extracting and manipulating the motion vectors
Related
I would like to load video from file, make some transformation on it and render it back into file. Said transformation is mainly two videos overlapping and shifting one of them in time. Grafika has some examples relevant to this issue. RecordFBOActivity.java contains some code for rendering video file from surface. I'm having trouble changing two things:
instead of rendering primitives in motion I need to render previously decoded and transformed video
I would like to render surface to file as fast as posible, not along with playback
My only success so far was to load .mp4 file and add some basic seeking features to PlayMovieActivity.java. In my reasearch I came across these examples, which are also using generated video. I didn't found them quite useful, because I couldn't swap this generated video with decoded one from file.
Is it posible to modify code of RecordFBOActivity.java so it can display video from file instead of generated animation?
You can try INDE Media for Mobile, tutorials are here: https://software.intel.com/en-us/articles/intel-inde-media-pack-for-android-tutorials
Sample code showing how to enable editing or make transformation is on github: https://github.com/INDExOS/media-for-mobile
It has transcoding\remuxing functionality in MediaComposer class and a possibility to edit or transform frames. Since it uses MediaCodec API inside encoding is done on GPU so is very battery friendly and works as fast as possible.
I want to stream desktop screen captures using sockets.
I don't know the exact way to do this, so I went with AWT's robot :)
Robot robot = new Robot();
BufferedImage image = robot.createScreenCapture(screenRectangle);
The problem is that images coming from the robot are too large to make a stream.
A 1440x900 capture is about 0.3MB and I can't transfer it fast enough to create a smooth 24fps stream.
Currently I'm using a TCP socket, because I had problems cutting down the image into multiple parts and sending them over with UDP.
Probably this isn't the right method, but what is? How are HD video streams transferred?
Thanks in advance
I think you'll need external library to create video (may be platform dependent).
The approach with images is simple but you'll need to send each frame. When you use video codec size is smaller because it sends some of frames in full size and other contain only changed part of the picture
See here:
http://en.wikipedia.org/wiki/Key_frame
http://en.wikipedia.org/wiki/I-frame
Here some open-source libs I just googled:
https://code.google.com/p/java-screen-recorder/
http://www.xuggle.com/xuggler/
I think You also can find some libs to create video stream from images...
How are HD video streams transferred?
Typically as a video stream, which a 'group of images' is not. Video codecs often have clever ways to compress groups of images further, e.g. by only showing the part of the next frame that is different to the previous one.
You might also want to look into encoding the images as a high compression JPEG.
Having said that, I doubt you'll get a very good transfer rate at that size in pixels.
Is there any API or library in Java available that will let me modify tags in the metadata for mp4 files? I need to modify the orientation (or rotation) tag in order to get videos to playback in the correction orientation. Something for Android would be preferrable.
Full disclosure: I'm the creator and maintainer of the mp4parser lib.
Use http://mp4parser.googlecode.com for opening the MP4 file. Navigate to the exif box (I have never seen that box) and modify it. Then write the file back to disk.
But are you really sure the exif box is changing the playback behavior? It rather seems to be an info box that tells you something about the recording situation.
I'd rather think you should modify the matrix in the Track Header Box (/moov/trak/tkhd) to retate the video. You might want to have a look a the Matrices part of the quicktime format specification (same as MP4 - at least for the matrices)
This answer here helps you with the matrix: https://stackoverflow.com/a/8177749/829133
Like soundcloud and zippyshare1, how can I generate an audio waveform image using java? are there any frameworks or open source libraries available for such case?
I wanted to generate an audio waveform as an image, and upon loading a track, the waveform image with will be loaded.
Start with this answer. The "further processing.." in this case might be to add each instantaneous value to a GeneralPath, then (scale that path to fit within the painting area and) draw it.
Here are two questions with answers on SO:
Java Program to create a PNG waveform for an audio file
How can I draw sound data from my wav file?
I like my answer to the second question the best because it explains how to do it in all cases, but it doesn't give code.
There are lots of other answers, too.
I need to an algorithm, to write frames (Pictures) into a file, which can be read by some Video-Cutting/Producing-Software to work with.
So I got frames, and I want to give them a input into a function/Method.
Let's do i in Java.
How can I do this?
Is there a simple way, I can write videofiles without using any systemcodecs?
I just need a uncompressed video with a constant Framerate (25 fps or 50 fps)
that will take my true-Color pictures (2D-arrays of Colors), so that I can use that video in my Videoprogramm to work with.
I never found any fileformat that fits to that.
Can You help me?
Greetings from Austria, and thanks. Flo.
Depending on the program you want to use to further process your movie you can also simply create PNGs (or TGAs or BMPs) for the single frames. VirtualDub e.g. can use images as frames for a movie.
The AVI container format can contain streams of uncompressed video, of which there are many types to choose from. Have a look here http://fourcc.org/ at the RGB and YUV formats, and here http://www.alexander-noe.com/video/documentation/avi.pdf for details on the AVI file format.