package com.zone;
import org.bytedeco.javacv.*;
import org.bytedeco.javacv.Frame;
public class Util {
/**
* 提取音频
* @param sourceFileName 视频文件(mp4)
* @param audioUrl 转音频后存放文件目录, 文件名为 原文件名+ .mp3
* @return void
*/
public static void extractVoice(String sourceFileName, String audioUrl) throws FFmpegFrameGrabber.Exception, FFmpegFrameRecorder.Exception {
//抓取资源
FFmpegFrameGrabber frameGrabber = new FFmpegFrameGrabber(sourceFileName);
Frame frame = null;
FFmpegFrameRecorder recorder = null;
frameGrabber.start();
//转录为单轨, 16K采样率, wav格式
recorder = new FFmpegFrameRecorder(audioUrl, frameGrabber.getAudioChannels());//frameGrabber.getAudioChannels()
// recorder.setFormat("mp3");
recorder.setFormat(frameGrabber.getFormat());
recorder.setSampleRate(frameGrabber.getSampleRate());//frameGrabber.getSampleRate()
//recorder.setAudioBitrate(128000);// 音频比特率
recorder.setTimestamp(frameGrabber.getTimestamp());
recorder.start();
int index = 0;
while (true) {
frame = frameGrabber.grabSamples();
if (frame == null) break;
if (frame.samples != null) {
recorder.recordSamples(frame.sampleRate, frame.audioChannels, frame.samples);
recorder.setTimestamp(frameGrabber.getTimestamp());
}
index++;
}
recorder.stop();
recorder.release();
frameGrabber.stop();
frameGrabber.release();
}
}
