音频处理工具ffmpeg的简单使用

共计 1921 个字符，预计需要花费 5 分钟才能阅读完成。

一、去官网下载
传送门：http://ffmpeg.org

二、使用 ffmpeg 将视频.mp4 转成音频.avi

三、截取视频的封面

public void getCover(String videoInputPath, String coverOutputPath) throws IOException, InterruptedException {
// ffmpeg.exe -ss 00:00:01 -i spring.mp4 -vframes 1 bb.jpg
List<String> command = new java.util.ArrayList<String>();
command.add(ffmpegEXE);

// 指定截取第 1 秒
command.add(“-ss”);
command.add(“00:00:01”);

command.add(“-y”);
command.add(“-i”);
command.add(videoInputPath);

command.add(“-vframes”);
command.add(“1″);

command.add(coverOutputPath);

for (String c : command) {
System.out.print(c + ” “);
}

ProcessBuilder builder = new ProcessBuilder(command);
Process process = builder.start();

InputStream errorStream = process.getErrorStream();
InputStreamReader inputStreamReader = new InputStreamReader(errorStream);
BufferedReader br = new BufferedReader(inputStreamReader);

String line = “”;
while ((line = br.readLine()) != null ) {
}

if (br != null) {
br.close();
}
if (inputStreamReader != null) {
inputStreamReader.close();
}
if (errorStream != null) {
errorStream.close();
}
}
四、将视频和音乐合并在一起，即为视频选一首背景音乐

public void convertor(String videoInputPath, String mp3InputPath, double seconds, String videoOutputPath) throws IOException {
//ffmpeg.exe -i dormitory.mp4 -i bgm.mp3 -t 6 -y 新的视频.mp4
List<String> command = new ArrayList<String>();
command.add(ffmpegEXE);
command.add(“-i”);
command.add(videoInputPath);
command.add(“-i”);
command.add(mp3InputPath);
command.add(“-t”);
command.add(String.valueOf(seconds));

// command.add(“-strict”); //linux 环境下如果截图需要添加下面两个参数
// command.add(“-2”);

command.add(“-y”);
command.add(videoOutputPath);

ProcessBuilder processBuilder = new ProcessBuilder(command);
Process process = processBuilder.start();
// 如果内存中太多流，会把当前线程卡住，需要清理
InputStream errorStream = process.getErrorStream();
InputStreamReader inputStreamReader = new InputStreamReader(errorStream);
BufferedReader br = new BufferedReader(inputStreamReader);
String line = “”;
while((line=br.readLine()) != null){

}
if(br != null){
br.close();
}
if(inputStreamReader != null){
inputStreamReader.close();
}
if(errorStream != null){
errorStream.close();
}

}