爲什麼不在Android上工作？

Question

我想將MP4文件轉換爲MP3文件。所以我只是用Jave來做。它在Windows平臺上運行得非常好，但它在Android中引發錯誤。

02-29 21:08:41.440 6946-7718/com.example.pulltorefreshtest W/System.err: it.sauronsoftware.jave.EncoderException: java.io.IOException: Error running exec(). Command: [/data/data/com.example.pulltorefreshtest/cache/jave-1/ffmpeg, -i, /storage/emulated/0/Android/data/com.example.pulltorefreshtest/cache/input.mp4, -vn, -acodec, libmp3lame, -ab, 64000, -ac, 2, -ar, 44100, -f, mp3, -y, /storage/emulated/0/Android/data/com.example.pulltorefreshtest/cache/hk2.mp3] Working Directory: null Environment: null 
02-29 21:08:41.440 6946-7718/com.example.pulltorefreshtest W/System.err:  at it.sauronsoftware.jave.Encoder.encode(Encoder.java:831) 
02-29 21:08:41.440 6946-7718/com.example.pulltorefreshtest W/System.err:  at com.example.pulltorefreshtest.Mp4ToMp3.run(Mp4ToMp3.java:47) 
02-29 21:08:41.440 6946-7718/com.example.pulltorefreshtest W/System.err: Caused by: java.io.IOException: Error running exec(). Command: [/data/data/com.example.pulltorefreshtest/cache/jave-1/ffmpeg, -i, /storage/emulated/0/Android/data/com.example.pulltorefreshtest/cache/input.mp4, -vn, -acodec, libmp3lame, -ab, 64000, -ac, 2, -ar, 44100, -f, mp3, -y, /storage/emulated/0/Android/data/com.example.pulltorefreshtest/cache/hk2.mp3] Working Directory: null Environment: null 
02-29 21:08:41.440 6946-7718/com.example.pulltorefreshtest W/System.err:  at java.lang.ProcessManager.exec(ProcessManager.java:211) 
02-29 21:08:41.440 6946-7718/com.example.pulltorefreshtest W/System.err:  at java.lang.Runtime.exec(Runtime.java:173) 
02-29 21:08:41.440 6946-7718/com.example.pulltorefreshtest W/System.err:  at java.lang.Runtime.exec(Runtime.java:128) 
02-29 21:08:41.440 6946-7718/com.example.pulltorefreshtest W/System.err:  at it.sauronsoftware.jave.FFMPEGExecutor.execute(FFMPEGExecutor.java:103) 
02-29 21:08:41.440 6946-7718/com.example.pulltorefreshtest W/System.err:  at it.sauronsoftware.jave.Encoder.encode(Encoder.java:829) 
02-29 21:08:41.440 6946-7718/com.example.pulltorefreshtest W/System.err: ... 1 more 
02-29 21:08:41.440 6946-7718/com.example.pulltorefreshtest W/System.err: Caused by: java.io.IOException: Permission denied 
02-29 21:08:41.440 6946-7718/com.example.pulltorefreshtest W/System.err:  at java.lang.ProcessManager.exec(Native Method) 
02-29 21:08:41.440 6946-7718/com.example.pulltorefreshtest W/System.err:  at java.lang.ProcessManager.exec(ProcessManager.java:209) 
02-29 21:08:41.440 6946-7718/com.example.pulltorefreshtest W/System.err: ... 5 more 

這是我的代碼，它在encoder.encoder函數中拋出一個錯誤。

package com.example.pulltorefreshtest; 

import android.util.Log; 
import android.widget.Toast; 

import java.io.File; 

import it.sauronsoftware.jave.AudioAttributes; 
import it.sauronsoftware.jave.EncoderException; 
import it.sauronsoftware.jave.EncodingAttributes; 
import it.sauronsoftware.jave.MultimediaInfo; 
import it.sauronsoftware.jave.Encoder; 

/** 
* Created by kankan on 2016/2/28. 
*/ 
public class Mp4ToMp3 extends Thread { 
Encoder encoder = null; 
AudioAttributes audioAttributes = null; 
EncodingAttributes encodingAttributes = null; 
MyListener myListener = null; 
File source = null; 
File target = null; 
public Mp4ToMp3(String inputFile, String outFile){ 
    source = new File(inputFile); 
    target = new File(outFile); 

    audioAttributes = new AudioAttributes(); 
    audioAttributes.setCodec("libmp3lame"); 
    audioAttributes.setBitRate(new Integer(64000)); 
    audioAttributes.setChannels(new Integer(2)); 
    audioAttributes.setSamplingRate(new Integer(44100)); 
    encodingAttributes = new EncodingAttributes(); 
    encodingAttributes.setFormat("mp3"); 
    encodingAttributes.setAudioAttributes(audioAttributes); 



    } 

@Override 
public void run() { 
    // MyListener myListener = new MyListener(); 
    Encoder encoder = new Encoder(); 
    try { 
     Log.i("hk","run"); 
     encoder.encode(source, target, encodingAttributes, myListener); 
    } catch (EncoderException e) { 
     e.printStackTrace(); 
    } 
} 

class MyListener implements it.sauronsoftware.jave.EncoderProgressListener{ 

    @Override 
    public void message(String arg0) { 
     // TODO Auto-generated method stub 
     // System.out.println(arg0); 
    } 

    @Override 
    public void progress(int arg0) { 
     // TODO Auto-generated method stub 
     //System.out.print(arg0); 
     //System.out.println(arg0); 
     String string = String .format("%d",arg0); 
     Log.d("hk",string); 
    } 

    @Override 
    public void sourceInfo(MultimediaInfo arg0) { 
     // TODO Auto-generated method stub 
     String string = arg0.toString(); 
     //System.out.println(string); 
    } 

} 
} 

Answer 1

事實上，我以前寫的代碼工作得很好。

Answer 2

您要運行的可執行文件。如果你的設備中有cache/jave-1/ffmpeg，就意味着它會運行，否則它不會運行。檢查路徑中的文件，否則指定正確的路徑。