从Android中的视频中提取MP3格式的音频

Question

我想在android中将视频文件转换为mp3文件。

我使用下面的代码将视频转换为MP3：

File source = new File(sourceFile); 
File target = new File(destFile); 
audioAttributes = new AudioAttributes(); 

audioAttributes.setCodec("libmp3lame"); 
audioAttributes.setBitRate(new Integer(128000)); 
audioAttributes.setChannels(new Integer(2)); 
audioAttributes.setSamplingRate(new Integer(44100)); 

EncodingAttributes encodingAttributes = new EncodingAttributes(); 
encodingAttributes.setFormat("mp3"); 
encodingAttributes.setAudioAttributes(audioAttributes); 

Encoder encoder = new Encoder(); 

try { 
    encoder.encode(source, target, encodingAttributes); 
} catch (EncoderException e) { 
    e.printStackTrace(); 
} 

但它无法正常工作。这里是我得到的错误：

java.io.IOException: Error running exec(). Command: [/bin/chmod, 755, /data/data/com.example.bansi_vasundhara.videotomp3_demo/cache/jave-1/ffmpeg] Working Directory: null Environment: null 
12-01 15:19:04.116 19702-19702/com.example.bansi_vasundhara.videotomp3_demo W/System.err:  at java.lang.ProcessManager.exec(ProcessManager.java:211) 
12-01 15:19:04.116 19702-19702/com.example.bansi_vasundhara.videotomp3_demo W/System.err:  at java.lang.Runtime.exec(Runtime.java:173) 
12-01 15:19:04.116 19702-19702/com.example.bansi_vasundhara.videotomp3_demo W/System.err:  at java.lang.Runtime.exec(Runtime.java:128) 
12-01 15:19:04.116 19702-19702/com.example.bansi_vasundhara.videotomp3_demo W/System.err:  at it.sauronsoftware.jave.DefaultFFMPEGLocator.<init>(DefaultFFMPEGLocator.java:85) 
12-01 15:19:04.116 19702-19702/com.example.bansi_vasundhara.videotomp3_demo W/System.err:  at it.sauronsoftware.jave.Encoder.<init>(Encoder.java:111) 
12-01 15:19:04.116 19702-19702/com.example.bansi_vasundhara.videotomp3_demo W/System.err:  at com.example.bansi_vasundhara.videotomp3_demo.MainActivity.onCreate(MainActivity.java:50) 
12-01 15:19:04.116 19702-19702/com.example.bansi_vasundhara.videotomp3_demo W/System.err:  at android.app.Activity.performCreate(Activity.java:6005) 
12-01 15:19:04.116 19702-19702/com.example.bansi_vasundhara.videotomp3_demo W/System.err:  at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1111) 
12-01 15:19:04.116 19702-19702/com.example.bansi_vasundhara.videotomp3_demo W/System.err:  at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2446) 
12-01 15:19:04.116 19702-19702/com.example.bansi_vasundhara.videotomp3_demo W/System.err:  at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2555) 
12-01 15:19:04.116 19702-19702/com.example.bansi_vasundhara.videotomp3_demo W/System.err:  at android.app.ActivityThread.access$800(ActivityThread.java:176) 
12-01 15:19:04.116 19702-19702/com.example.bansi_vasundhara.videotomp3_demo W/System.err:  at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1437) 
12-01 15:19:04.116 19702-19702/com.example.bansi_vasundhara.videotomp3_demo W/System.err:  at android.os.Handler.dispatchMessage(Handler.java:111) 
12-01 15:19:04.116 19702-19702/com.example.bansi_vasundhara.videotomp3_demo W/System.err:  at android.os.Looper.loop(Looper.java:194) 
12-01 15:19:04.116 19702-19702/com.example.bansi_vasundhara.videotomp3_demo W/System.err:  at android.app.ActivityThread.main(ActivityThread.java:5576) 
12-01 15:19:04.116 19702-19702/com.example.bansi_vasundhara.videotomp3_demo W/System.err:  at java.lang.reflect.Method.invoke(Native Method) 
12-01 15:19:04.116 19702-19702/com.example.bansi_vasundhara.videotomp3_demo W/System.err:  at java.lang.reflect.Method.invoke(Method.java:372) 
12-01 15:19:04.116 19702-19702/com.example.bansi_vasundhara.videotomp3_demo W/System.err:  at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:956) 
12-01 15:19:04.116 19702-19702/com.example.bansi_vasundhara.videotomp3_demo W/System.err:  at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:751) 
12-01 15:19:04.116 19702-19702/com.example.bansi_vasundhara.videotomp3_demo W/System.err: Caused by: java.io.IOException: No such file or directory 
12-01 15:19:04.116 19702-19702/com.example.bansi_vasundhara.videotomp3_demo W/System.err:  at java.lang.ProcessManager.exec(Native Method) 
12-01 15:19:04.116 19702-19702/com.example.bansi_vasundhara.videotomp3_demo W/System.err:  at java.lang.ProcessManager.exec(ProcessManager.java:209) 

任何想法可能是错误的？

Answer 1

使用FFMPEG为Android ü需要实现的方法（我认为它在FFmpeg库已经存在） 和u可以使用下面的命令来提取ffmpeg的Android的音频

ffmpeg -i input-video.avi -vn -acodec copy output-audio.aac