Repository: m3at/video-watermark-removal
Branch: main
Commit: b62cf673e986
Files: 6
Total size: 5.2 KB

Directory structure:
gitextract_q4svttha/

├── .gitignore
├── LICENSE
├── README.md
├── get_watermark.py
├── remove_watermark.sh
└── test.sh

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FILE CONTENTS
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FILE: .gitignore
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# Byte-compiled / optimized / DLL files
__pycache__/
*.py[cod]
*$py.class

# Local test files
test_samples/


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FILE: LICENSE
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MIT License

Copyright (c) 2021 Paul Willot

Permission is hereby granted, free of charge, to any person obtaining a copy
of this software and associated documentation files (the "Software"), to deal
in the Software without restriction, including without limitation the rights
to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
copies of the Software, and to permit persons to whom the Software is
furnished to do so, subject to the following conditions:

The above copyright notice and this permission notice shall be included in all
copies or substantial portions of the Software.

THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
SOFTWARE.


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FILE: README.md
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Remove static watermarks from videos with minimal setup.

![example of watermark removal](example_processed_frame.png)

Really basic, but works well enough for simple static watermarks, and can run on a laptop CPU (x3 real-time on a i5-5287U (2015 MacBook Pro), x9 real-time on a i5-8400). You can find brief explanations on how it's done [here](https://paulw.tokyo/post/basic-watermark-removal-in-videos/).

Dependencies:
```sh
# FFMPEG
installer=$([[ $(uname) == "Darwin" ]] && echo brew || echo apt)
$installer install ffmpeg

# Python libraries
python3 -m pip install numpy scipy imageio

# Optional, to fetch an example video
# if already installed, make sure youtube-dl is up to date
$installer install youtube-dl
```

Usage:
```sh
# The output will default to append "_cleaned" to the existing name,
# and use max 50 keyframes
./remove_watermark.sh /somewhere/my_video.mp4 [/somewhere/output.mp4] [max_keyframes_to_extract]
```

Tested on MacOS 10.14 (x86), MacOS 14.4 (arm) and Ubuntu 20.04


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FILE: get_watermark.py
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#!/usr/bin/env python3

import sys
from pathlib import Path

import imageio
import numpy as np
from scipy.ndimage import gaussian_filter


def normalize(x):
    _min = np.min(x)
    _max = np.max(x)
    return (x - _min) / (_max - _min)


if __name__ == "__main__":
    # Load all images
    root = Path(sys.argv[1])
    buff = []
    for p in root.glob("output_*.png"):
        buff.append(imageio.imread(p))
    images = np.array(buff)

    # Compute the gradients
    dx = np.gradient(images, axis=1).mean(axis=3)
    dy = np.gradient(images, axis=2).mean(axis=3)
    mean_dx = np.abs(np.mean(dx, axis=0))
    mean_dy = np.abs(np.mean(dy, axis=0))

    # Filter at a hand picked threshold
    threshold = 10
    salient = ((mean_dx > threshold) | (mean_dy > threshold)).astype(float)
    salient = normalize(gaussian_filter(salient, sigma=3))
    mask = ((salient > 0.2) * 255).astype(np.uint8)

    # Saved the computed mask
    imageio.imsave(root / "mask.png", mask)


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FILE: remove_watermark.sh
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#!/usr/bin/env bash

set -eo pipefail

# Prepare output name
file_no_ext="${1%.*}"
extension="${1##*.}"
def_name="$file_no_ext""_cleaned.""$extension"
output_file="${2:-$def_name}"

# Get first few key frames
echo "Getting key frames..."
max_frames="${3:-50}"
keyframes_time=$(ffprobe -hide_banner -loglevel warning -select_streams v -skip_frame nokey -show_frames -show_entries frame=pkt_dts_time "$1" | grep "pkt_dts_time=" | xargs shuf -n "$max_frames" -e | awk -F  "=" '{print $2}')

# Save them as images, in a temporary directory
tmpdir=$(mktemp -d 2>/dev/null || mktemp -d -t 'watermark_remove')
counter=0
echo -n "Extracting frames (up to: $max_frames)... "
for i in $keyframes_time; do
    if ! [[ "$i" =~ ^[0-9]+([.][0-9]+)?$ ]]; then
        echo "Skipping unrecognize timing: $i"
        continue
    fi
    ffmpeg -y -hide_banner -loglevel error -ss "$i" -i "$1" -vframes 1 "$tmpdir/output_$counter.png"
    echo -n "$counter "
    ((counter=counter+1))
done
echo

# Abort if we couldn't extract frames for some reason
if [[ "$counter" -lt 2 ]]; then
    echo "$counter frames extracted, need at least 2, aborting."
    exit 1
fi

echo "Extracting watermark..."
./get_watermark.py "$tmpdir"

echo "Removing watermark in video..."
ffmpeg -hide_banner -loglevel warning -y -stats -i "$1" -acodec copy -vf "removelogo=$tmpdir/mask.png" "$output_file"

rm -rf "$tmpdir"

echo "Done"

exit 0


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FILE: test.sh
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#!/usr/bin/env bash


set -eo pipefail

# Store samples there
mkdir -p test_samples

# Get the first 3 minutes of Spring (Blender Open Movie) after the opening credits, 720p video only
echo "Fetching sample movie"
URL=$(youtube-dl -g -f136 "https://youtu.be/WhWc3b3KhnY")
ffmpeg -hide_banner -loglevel warning -y -stats -ss 00:23 -t 03:00 -i "$URL" -c copy ./test_samples/original.mp4

# Add simple text as watermark
echo "Adding watermark"
ffmpeg -hide_banner -loglevel warning -y -stats -i ./test_samples/original.mp4 -filter_complex "[0:v]drawtext='font=sans-serif:fontsize=30:fontcolor=white:x=20:y=20:text=Watermark (TM)'" ./test_samples/watermarked.mp4

# Test watermark removal
echo "Tesing:"
echo
./remove_watermark.sh test_samples/watermarked.mp4