Here’s a sample README.md for your custom React Native NPM package, rnvideo-ffmpeg-processor.

rnvideo-ffmpeg-processor

A React Native module that enables powerful video processing using FFmpeg, including features such as trimming, cropping, merging videos, adding text overlays, and much more.

Features

• Trim Video: Select the start and end times to trim a video.
• Crop Video: Crop the video to a specific area or aspect ratio.
• Merge Videos: Combine multiple videos into one.
• Add Audio: Merge audio files with video files.
• Text Overlays: Add text to videos with customizable font, color, and position.
• Apply Filters: Use FFmpeg filters to adjust brightness, contrast, etc.
• Mute Video: Remove audio tracks from videos.
• Rotate Video: Rotate videos by 90, 180, or 270 degrees.

Installation

To install this package, run:

npm install rnvideo-ffmpeg-processor

Link Native Modules (if React Native version < 0.60)

For React Native versions below 0.60, you’ll need to link the native modules manually:

npx react-native link react-native-ffmpeg

For React Native 0.60 and above, the module should be auto-linked.

iOS

Make sure you have the latest version of CocoaPods installed, and run:

cd ios
pod install

Android

Add the following to your android/app/build.gradle file:

android {
    ...
    packagingOptions {
        pickFirst 'lib/x86/libc++_shared.so'
        pickFirst 'lib/x86_64/libc++_shared.so'
        pickFirst 'lib/arm64-v8a/libc++_shared.so'
        pickFirst 'lib/armeabi-v7a/libc++_shared.so'
    }
}

Usage

Import the Module

import VideoProcessor from 'rnvideo-ffmpeg-processor';

Trim Video

const trimVideo = async () => {
  try {
    const result = await VideoProcessor.trimVideo(
      '/path/to/video.mp4',
      '00:00:10',
      '00:00:20',
      '/path/to/output.mp4',
    );
    console.log(result); // Success message or error handling
  } catch (error) {
    console.error(error);
  }
};

Crop Video

const cropVideo = async () => {
  try {
    const result = await VideoProcessor.cropVideo(
      '/path/to/video.mp4',
      640,
      360,
      10,
      10,
      '/path/to/output.mp4',
    );
    console.log(result); // Success message or error handling
  } catch (error) {
    console.error(error);
  }
};

Merge Videos

const mergeVideos = async () => {
  try {
    const result = await VideoProcessor.mergeVideos(
      ['/path/to/video1.mp4', '/path/to/video2.mp4'],
      '/path/to/output.mp4',
    );
    console.log(result); // Success message or error handling
  } catch (error) {
    console.error(error);
  }
};

Add Text Overlay

const addTextOverlay = async () => {
  try {
    const result = await VideoProcessor.addTextOverlay(
      '/path/to/video.mp4',
      'Your text here',
      100,
      200,
      '/path/to/output.mp4',
    );
    console.log(result); // Success message or error handling
  } catch (error) {
    console.error(error);
  }
};

Mute Video

const muteVideo = async () => {
  try {
    const result = await VideoProcessor.muteVideo(
      '/path/to/video.mp4',
      '/path/to/output.mp4',
    );
    console.log(result); // Success message or error handling
  } catch (error) {
    console.error(error);
  }
};

Supported Features

• Trimming: Cut videos by specifying start and end times.
• Cropping: Resize the video frame by defining width, height, and position.
• Audio Merge: Add background music or voice-over tracks to your videos.
• Text Overlay: Add customizable text on video, including color, size, and position.
• Video Filters: Apply visual filters such as brightness and contrast adjustments.
• Rotate Video: Rotate videos to any angle (90°, 180°, 270°).
• Mute Audio: Remove audio from videos.

FFmpeg Commands

Internally, this module leverages FFmpeg commands to process videos. Example commands include:

• Trim: -ss [start_time] -t [duration] -i [input_path] -c copy [output_path]
• Crop: -i [input_path] -filter:v "crop=[width]:[height]:[x]:[y]" [output_path]
• Merge Videos: -i "concat:[file1|file2]" -c copy [output_path]
• Text Overlay: -i [input_path] -vf drawtext="text='[text]':x=[x]:y=[y]:fontsize=24:fontcolor=white" [output_path]

Contributing

We welcome contributions! Please follow these steps:

1. Fork the repo.
2. Create a new branch (git checkout -b feature-branch).
3. Make your changes and commit (git commit -m 'Add some feature').
4. Push to the branch (git push origin feature-branch).
5. Submit a pull request.

License

MIT

This project is licensed under the MIT License - see the LICENSE file for details.

Contact

If you have any issues, feel free to open an issue or contact me via GitHub.

Key Sections Included:

• Installation: How to install and link the package for both iOS and Android.
• Usage Examples: Detailed code examples for using various features such as trimming, cropping, merging, etc.
• FFmpeg Commands: Under-the-hood FFmpeg commands for those who want more control.
• Contributing: Guidelines for contributing to the project.
• License: License information.

This README.md provides clear instructions for developers to use and contribute to the package.