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Java - AAC MP4 - How to get media length?

Does anyone know how to get the length of aac audio format (audio format) mp4 (file format) media file in Java?

Any help would be much appreciated.

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4 answers


Here is the solution I found (using mp4parser on github ):



public static long getAudioLength(byte[] content) throws Exception {
    IsoFile isoFile = new IsoFile(new MemoryDataSourceImpl(content));
    double lengthInSeconds = (double)isoFile.getMovieBox().getMovieHeaderBox().getDuration() / isoFile.getMovieBox().getMovieHeaderBox().getTimescale();
    return (long)lengthInSeconds;
}
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muxer (mentioned by @ user3489820) was created in mp4parser and now lives separately at org.mp4parser / muxer . Maven package has been changed to org.mp4parser/mp4parser

. For more information see https://mvnrepository.com/artifact/org.mp4parser/isoparser and have a look at IsoParser , multiplexer and streaming JavaDoc.

I updated @ user3489820's sample code, added imports, crossed out extra code, and removed unnecessary casts. I also removed the call MemoryDataSourceImpl

because my project needed to determine the length of the MP4 file on disk, and this class was not needed:



import java.io.File;
import org.mp4parser.IsoFile;
import org.mp4parser.boxes.iso14496.part12.MovieHeaderBox;

public class Blah {
    public static long getAudioLength(File file) throws Exception {
        IsoFile isoFile = new IsoFile(file);
        MovieHeaderBox mhb = isoFile.getMovieBox().getMovieHeaderBox();
        return mhb.getDuration() / mhb.getTimescale();
    }
}
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You can try this code ...

File file = new file ("filename.mp3"); AudioFileFormat baseFileFormat = new MpegAudioFileReader (). GetAudioFileFormat (file); Map properties = baseFileFormat.properties (); Long duration = (Long) properties.get ("duration");

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You can use ffmpeg to get the duration of any media:

First, get the command output from the runtime:

  public String execute(String cmd) {
    String output=null;
      try {
        Runtime rt = Runtime.getRuntime();
        Process pr=rt.exec(cmd);
        final InputStream es=pr.getErrorStream();
        class C extends Thread {
          String type, output="";
          InputStream is;
          public C(InputStream is, String type) { this.is=is; this.type=type; }
          public void run() {
            try {
              InputStreamReader isr = new InputStreamReader(is);
              BufferedReader br = new BufferedReader(isr);
              String line=null;
              while((line=br.readLine())!=null)
                output+=line+" ";
            }
            catch (IOException ioe) { ioe.printStackTrace(); }
          }
        };
        C t=new C(es);
        t.start();
        int exitVal=pr.waitFor();
        System.out.println("ExitValue: " + exitVal);
        output=""+t.output;
      }
      catch(Throwable t) { t.printStackTrace(); }
      return output;
  }

Then analyze the output for "Duration":

  public int getTime(String out) {
    int i=0, j=0, k, l, x=0, y=0, ind=0;
    String d="", frs="";
    BufferedReader dis=null;
    String nextline=out;
    ind=0;
    if((ind=nextline.indexOf("Duration:"))>-1)
      d=nextline.substring(ind+9, nextline.indexOf(',', ind+1)).trim();
      int ind2=0;
      int h=0, m=0, s=0, xxx=0;
      if((ind=d.indexOf(":"))>-1) {
        h=Integer.parseInt(d.substring(ind2, ind));
        ind2=ind+1;
      }
      if((ind=d.indexOf(":", ind+1))>-1) {
        m=Integer.parseInt(d.substring(ind2, ind));
        ind2=ind+1;
      }
      if((ind=d.indexOf(".", ind+1))>-1) {
        s=Integer.parseInt(d.substring(ind2, ind));
      }
      if(ind<d.length()) {
        ind2=ind+1;
        if((ind=d.indexOf(".", ind+1))>-1) {
          xxx=Integer.parseInt(d.substring(ind2, d.length()));
        }
      }
      try {
        dis.close();
      }
      catch (Exception ex) { }
    return h*3600+m*60+s;
  }

Total:

  String out=execute("ffmpeg -i myfile.mp4");
  int time=getTime(out);
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