java - Xuggler 视频到音频转换

Question

我正在使用 Java 中的 Xuggler 库将视频转换为音频。程序中没有出现错误或异常，但生成的音频文件为 0 Kb。有人可以解决这个问题吗？

环境:Eclipse Helios，操作系统:Windows 7

添加到项目的外部 JAR 库:

(1)slf4j-api-1.7.7.jar
(2)slf4j-simple-1.7.7.jar
(3)xuggle-xuggler-5.4.jar

视频到音频转换的代码片段。

import com.xuggle.mediatool.IMediaReader; 
import com.xuggle.mediatool.IMediaWriter; 
import com.xuggle.mediatool.ToolFactory; 
import com.xuggle.xuggler.ICodec; 

public class VideoToAudio{

    public void convertVideoToAudio(){
        IMediaReader reader = ToolFactory.makeReader("D://vid.mp4");
        IMediaWriter writer = ToolFactory.makeWriter("D://a.mp3",reader);

        int sampleRate = 44100;
        int channels = 1;

        writer.addAudioStream(0, 0, ICodec.ID.CODEC_ID_MP3, channels, sampleRate);
        while (reader.readPacket() == null);
    }

    public static void main(String [] args){
        VideoToAudio vta = new VideoToAudio();
        try{
            vta.convertVideoToAudio();
        }
        catch(Exception e){
            System.out.println("Could not open video file");
        }
    }
}

Answer 1

你的程序看起来不错，你只是忘记了一行:)

public void convertVideoToAudio(){
    IMediaReader reader = ToolFactory.makeReader("D://vid.mp4");
    IMediaWriter writer = ToolFactory.makeWriter("D://a.mp3",reader);

    int sampleRate = 44100;
    int channels = 1;

    writer.addAudioStream(1, 0, ICodec.ID.CODEC_ID_MP3, channels, sampleRate);
->  reader.addListener(writer);

    while (reader.readPacket() == null);
}