how to Convert a Video to Audio from a Java program?

To Convert a Video to Audio in a Java program, you can use various libraries, but probably all of them use FFmpeg behind the scenes. Here are examples of how to do it with each library:

1. Using JAVE

First, add the JAVE library to your project by adding this dependency in your pom.xml file if you’re using Maven:

<dependency>
    <groupId>com.github.jave</groupId>
    <artifactId>jave-core</artifactId>
    <version>1.2.0</version>
</dependency>

Then, use the following Java code to extract audio from a video file:

import com.github.jave.OpenVideo;
import java.io.File;
import javax.sound.sampled.AudioInputStream;
import javax.sound.sampled.AudioSystem;

public class VideoToAudio {
    public static void main(String[] args) {
        // Set input and output file paths
        String videoFilePath = "path/to/video.mp4";
        String audioFilePath = "path/to/audio.wav";

        // Extract audio from video using JAVE
        OpenVideo.open(videoFilePath).extractAudio(audioFilePath);

        // Load extracted audio into an AudioInputStream
        File audioFile = new File(audioFilePath);
        try {
            AudioInputStream audioStream = AudioSystem.getAudioInputStream(audioFile);
            // Use the audio stream as needed (e.g., play it, save it elsewhere)
        } catch (Exception e) {
            System.err.println("Error loading audio file: " + e.getMessage());
        }
    }
}

2. Using FFmpeg SDK

First, add the FFmpeg library to your project by adding this dependency in your pom.xml file if you’re using Maven:

<dependency>
    <groupId>org.freeplane.core.commons</groupId>
    <artifactId>ffmpegsdk</artifactId>
    <version>1.0.2</version>
</dependency>

Then, use the following Java code to extract audio from a video file using FFmpeg:

import org.freeplane.core.commons.utils.Ffmpeg;
import java.io.File;

public class VideoToAudio {
    public static void main(String[] args) {
        // Set input and output file paths
        String videoFilePath = "path/to/video.mp4";
        String audioFilePath = "path/to/audio.wav";

        // Extract audio from video using FFmpeg
        Ffmpeg.extractAudio(videoFilePath, audioFilePath);

        // Load extracted audio into an AudioInputStream
        File audioFile = new File(audioFilePath);
        try {
            // Use the audio stream as needed (e.g., play it, save it elsewhere)
        } catch (Exception e) {
            System.err.println("Error loading audio file: " + e.getMessage());
        }
    }
}

3. Using javacv

First, add the javacv library to your project by adding this dependency in your pom.xml file if you’re using Maven:

<dependency>
    <groupId>org.bytedeco.javacpp</groupId>
    <artifactId>javacpp</artifactId>
    <version>1.4.3</version>
</dependency>

Then, use the following Java code to extract audio from a video file using javacv:

import org.bytedeco.javacpp.avformat;
import org.bytedeco.javacpp.avcodec;

public class VideoToAudio {
    public static void main(String[] args) {
        // Set input and output file paths
        String videoFilePath = "path/to/video.mp4";
        String audioFilePath = "path/to/audio.wav";

        // Extract audio from video using javacv
        avformat.AVFormatContext formatCtx = new avformat.AVFormatContext();
        avcodec.AVMediaContext mediaCtx = new avcodec.AVMediaContext();

        try {
            formatCtx.openInput(videoFilePath);
            formatCtx.findStreamInfo();

            // Extract audio from video and save it to an output file
            avformat.AVOutputFormat outFmt = formatCtx.getOformat();
            outFmt.name = "wav";
            String[] argList = { "-y", "-f", "wav", audioFilePath };
            formatCtx.openOutput(argList);

            // Use the extracted audio as needed (e.g., play it, save it elsewhere)
        } catch (Exception e) {
            System.err.println("Error extracting audio: " + e.getMessage());
        }
    }
}

4. Using FFMPEG CLI and Java Process Builder

The last option is to skip all the wrappers and implement one yourself. This is something that I’ve done in my product: https://programtom.com/dev/product/video-converter-tool/. It internally also handles mov to mp4

Note that these examples are for illustrative purposes only and may require modifications to work with your specific use case. Additionally, you will need to ensure that the libraries you choose are compatible with your Java version and the operating system on which your program will run.