我在hdfs中上传了一个视频文件,现在想读取视频文件的一些信息
String uri = "hdfs://master:9000/input/video1.mp4";
Configuration conf = new Configuration();
FileSystem fs = FileSystem.get(URI.create(uri), conf);
InputStream in = null;
try {
in = fs.open(new Path(uri));
}finally {
}
File source = null;
inputstreamtofile(in,source);
Encoder encoder = new Encoder();
try {
MultimediaInfo m = encoder.getInfo(source);
long ls = m.getDuration();
System.out.println("此视频时长为:"+ls/60000+"分"+(ls/000)/1000+"秒!");
} catch(Exception e) {
e.printStackTrace();
}
其中 inputstreamtofile是想将数据流转化为File
public static void inputstreamtofile(InputStream in,File sor) throws IOException{
OutputStream os = new FileOutputStream(sor);
int bytesRead = 0;
byte[] buffer = new byte[19230720];
while ((bytesRead = in.read(buffer, 0, 19230720)) != -1) {
os.write(buffer, 0, bytesRead);
}
os.close();
in.close();
}
但是运行时候会有空指针异常
Exception in thread "main" java.lang.NullPointerException
at java.io.FileOutputStream.(FileOutputStream.java:212)
at java.io.FileOutputStream.(FileOutputStream.java:171)
at mapreduce.readvideoinfo.inputstreamtofile(readvideoinfo.java:20)
at mapreduce.readvideoinfo.main(readvideoinfo.java:40)
这个应该怎么改呢