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Perturbation Implementation in DeeperForensics-1.0

This is a tutorial for using our perturbation codes.

Dependencies

  • FFmpeg with the H.264 and XVID codec
  • python 3
  • opencv-python
  • numpy
  • tqdm

Installation

Please first install FFmpeg with the H.264 and XVID codec for your operating system, following this official guide.

Then, we recommend you to create a new conda environment with python 3. After installing Anaconda 3, you can run the following command:

conda create -n ptb python=3.7 -y
conda activate ptb

Finally, clone our repo and install other dependencies via pip:

git clone https://github.com/EndlessSora/DeeperForensics-1.0.git
cd DeeperForensics-1.0/perturbation/
pip install -r requirements.txt

Usage

Apply a distortion to video

You can apply 7 types of perturbations at 5 intensity levels mentioned in our paper to a video. We also provide the distortion meta files of our dataset. Following this tutorial, you can easily reproduce the perturbed videos.

For a quick start

We put a video example data/input.mp4, you can simply run:

bash scripts/run.sh

or:

bash scripts/run_via_xvid.sh

Please see scripts/run.sh or scripts/run_via_xvid.sh for details. The script will apply random-type random-level distortion to the input video, and generate an output video at results/output.mp4, as well as a meta file at metas/meta.txt.

Arguments

We run add_distortion_to_video.py to apply a distortion to video. For its argument details, please read the argument explanation. Note: if you would like to strictly align with the distortions in our dataset, please add --via_xvid in your command. You can also find the reason in the argument explanation.

Mixed distortions

If you want to add mixed distortions to a single video, just simply run our code by multiple times (remember to change --vid_in, and you can use the meta history to avoid adding repeated distortions to a single video).

Check video information

We recommend you to check that some necessary information of the output video remains unchanged after you apply distortions. This will reduce potential errors in the further process.

For a quick start

After run scripts/run.sh or scripts/run_via_xvid.sh, you can simply run:

bash scripts/check.sh

Please see scripts/check.sh for details. If you encounter AssertionError, then your output video has some problems. You may need to fix the problems by re-applying the distortion. If you can see an output log saying 'No problem.', feel free to further process the video as you like.

Arguments

We run check_video.py to check video information. For its argument details, please read the argument explanation.