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• avcodec/libzvbi-teletextdec : fix txt_default_region limits

  9 juin 2020, par Marton Balint

  avcodec/libzvbi-teletextdec : fix txt_default_region limits
  Max region ID is 87. Also the region affects not only the G0 charset but G2 and
  
  the national subset as well.
  Signed-off-by : Marton Balint <cus@passwd.hu>
  

  • [DH] doc/decoders.texi
  • [DH] libavcodec/libzvbi-teletextdec.c

• Recommendataions for robust and invisible video watermarking software / library [on hold]

  1er mars 2014, par id128

  I am doing a research project in search of a robust and invisible video watermarking software / library (preferably in C++). It needs to meet the following requirements :

  • Robust - that is the watermark needs to survive common transformations such as re-encoding, A/D / D/A conversion, luminance/color change, shift, and crop (both in size and length)'

  • Invisible - to the human eye

  The watermark does not need to carry too much data - maybe a 64-bit UUID - and can be temporal or spatial. But I will need the ability to determine the existence (or not) of the watermark with only a few seconds of the video

  Some research I have done so far :

  • JAWS research paper (http://pdf.aminer.org/000/316/002/the_viva_project_digital_watermarking_for_broadcast_monitoring.pdf) but cannot find any implementations on the web and the authors are not responding to emails. Plus, that research is over 10 years old and I am hoping for something more modern.

  • OpenPuff - does not satisfy the robustness requirement in that the resulting video does not survive transformations.

  • ffmpeg software - I have figured out how to overlay a visible watermark, but that does not satisfy the invisibility requirement.

  Any ideas / suggestions / pointers will be awesome. Thanks.

• Ask Help for Reproduce AccMPEG coded by Du Kuntai

  30 novembre 2022, par censhallwe

  Here is his github : https://github.com/KuntaiDu/AccMPEG
When I follow his steps to reproduce AccMPEG, I meet some problems. It's my first time to reproduce others' paper. When I set up the conda environment, the conda_env.yml has some pip errors and stop like picture1 :
  
PIC 1.
  
So I change its name to accmpeg (originally diff) and delete some code about torch/torchvision/torchaudio/detectron2. After setup the environment, I run generate_mpeg_curve.py and meet some errors like picture2 :
  
PIC 2.
  
Maybe I failed to setup the environment. And when I run batch_blackgen_roi.py, I meet some errors like these :
  
IMG 3.
  
I search accmpeg and want to try to find solution from the Internet. But I don't get useful information. Therefore, I try to seek help. If you can give me a hand, I am very grateful.
  
If you can reproduce it well, please teach me how to operate. It's better if you have some useful pictures.Thanks very much !