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• RGB Steganography on Video Files

  12 novembre 2018, par HowellJenkins

  Hi I have done image steganography in Python Image Library (PIL).

  ::edit: :
  Using LSB technique on pixel color data e.g. (255, 255, 255)

  I want to read frames before they are displayed, modify the pixels to implement LSB steganography and then display the modified frame(s) using FFMpeg or similar media library.

  How do I modify the RGB value of frames for video playback ?

  What I have accomplished to date is limited to images only. In PIL, one can open an image and access a 2-D pixel array and introduce a new tuple of RGB values.

  Also, I have tried using Python Image Library to create an animated gif as an alternative using images as frames, but there is a loss of quality ; hence, affecting the payload for the steganography. There is a grainy effect and it was used with PNG files to GIF, both utilizing lossless compression ; however, I read it had to do with a generalized color palette chosen to render the images.

  To modify the video stream in say an mp4 file, would require extensive knowledge of the moov and mdat atoms and the structure of the video container.

  FFMpeg is fairly complex as well. I noticed that the AVPacket structure may contain frame data.

• Automated Video creation for Graphic Data using Java or Python [on hold]

  20 mars 2016, par Amit

  

  Chart Shows what I am trying to achieve. bottom line is that I want to create a video from a dataset which provides me enough data points to plot bar/pie graphs. I also want to add a audio to it for which text is created programatically. I need help for -

  • I have tried using jfreeChart. But when create an image from it, the quality of it is not good enough to create video from that image. Is there any other better options to plot nice graphs and create images from it ? Idea is to save these charts/images on disk, mix audio using ffmpeg utility to finally create a video.

  I would prefer something using Java / Python since I already know it.

• amf : Replace writer_id option with LIBAV_AMF_WRITER_ID constant

  28 février 2018, par Alexander Kravchenko

  amf : Replace writer_id option with LIBAV_AMF_WRITER_ID constant
  AMFTraceWriter is an abstraction to configure how AMF outputs its logs
  
  for the current process and can be configured to output different levels
  
  of trace output. If multiple LibavWriter objects are used in one process,
  
  there will be duplication of output in av_log. Use a constant writer_id
  
  to prevent this scenario.
  Signed-off-by : Diego Biurrun <diego@biurrun.de>
  

  • [DBH] libavcodec/amfenc.c
  • [DBH] libavcodec/amfenc.h