MediaRecorder error IOException: Preparation failed
I want to use MediaRecorder for voice recording, my code is:
public void record(View v) {
Log.d(TAG, "record");
this.mediaRecorder.setAudioChannels(1);
this.mediaRecorder.setAudioSamplingRate(44100);
this.mediaRecorder.setAudioEncodingBitRate(64000);
this.mediaRecorder.setAudioSource(MediaRecorder.AudioSource.MIC);
this.mediaRecorder.setOutputFormat(MediaRecorder.OutputFormat.MPEG_4);
this.mediaRecorder.setOutputFile(this.file.getAbsolutePath());
this.mediaRecorder.setAudioEncoder(MediaRecorder.AudioEncoder.AAC);
try {
this.mediaRecorder.prepare();
this.mediaRecorder.start();
// update the buttons
this.setButtonsEnabled(false, true, false);
} catch (IOException e) {
Log.e(TAG, "Failed to record()", e);
}
}
Or
public void record(View v) {
Log.d(TAG, "record");
this.mediaRecorder = new MediaRecorder();
this.mediaRecorder.setAudioChannels(1);
this.mediaRecorder.setAudioSamplingRate(8000);
this.mediaRecorder.setAudioEncodingBitRate(16);
this.mediaRecorder.setAudioSource(MediaRecorder.AudioSource.MIC);
this.mediaRecorder.setOutputFormat(MediaRecorder.OutputFormat.RAW_AMR);
this.mediaRecorder.setOutputFile(this.file.getAbsolutePath());
this.mediaRecorder.setAudioEncoder(MediaRecorder.AudioEncoder.AMR_NB);
try {
this.mediaRecorder.prepare();
this.mediaRecorder.start();
// update the buttons
this.setButtonsEnabled(false, true, false);
} catch (IOException e) {
Log.e(TAG, "Failed to record()", e);
}
}
Everything is fine on Samsung, but on Dell two methods fail
Here is the logcat:
02-01 13:56:51.094: E/AudioRecorderDemoActivity(1397): Failed to record()
02-01 13:56:51.094: E/AudioRecorderDemoActivity(1397): java.io.IOException: prepare failed.
02-01 13:56:51.094: E/AudioRecorderDemoActivity(1397): at android.media.MediaRecorder._prepare(Native Method)
02-01 13:56:51.094: E/AudioRecorderDemoActivity(1397): at android.media.MediaRecorder.prepare(MediaRecorder.java:524)
02-01 13:56:51.094: E/AudioRecorderDemoActivity(1397): at com.marakana.android.audiorecorderdemo.AudioRecorderDemoActivity.record(AudioRecorderDemoActivity.java:69)
02-01 14:05:20.074: E/AndroidRuntime(1790): FATAL EXCEPTION: main
02-01 14:05:20.074: E/AndroidRuntime(1790): java.lang.IllegalStateException: Could not execute method of the activity
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First, you look great. Have you added the required permissions to the manifest file?
<uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE" />
<uses-permission android:name="android.permission.RECORD_AUDIO" />
If so, try replacing:
this.mediaRecorder.setOutputFormat(MediaRecorder.OutputFormat.MPEG_4);
by
this.mediaRecorder.setOutputFormat(MediaRecorder.OutputFormat.THREE_GPP);
Don't forget to check the path of your video file is correct.
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This is a big problem, but it has a very small solution.
In most cases the filename we get from this.file.getAbsolutePath () contains file: /// as a prefix
////////////////////////////////////////////////* INCORRECT CODE */
this.mediaRecorder.setOutputFile(this.file.getAbsolutePath());
/*the above line sets a file url beginning with a "file:///"
//however, since this setOutputFile requires us to send a
//string referring to the uri, we will have to get rid of the
//"file:///" and simply write the uri */
////////////////////////////////////////////////* CORRECTED CODE BELOW */
this.mediaRecorder.setOutputFile(this.file.getAbsolutePath().substring(8));
/*the above line of code extracts the string uri eliminating
// file:/// */
Hope this answer is helpful
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This exception will be raised. if one of the following occurs:
file not found: make sure the location of the output file that was given by yu exists, otherwise it will throw you a filenotfoundexception
Write permission: You must specify the write permission in the manifest file.
Write permission: Specify the write permission in the manifest file.
you can use this.
<uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE"/>
<uses-permission android:name="android.permission.RECORD_AUDIO"/>
Still you get the error .. try to display the error. Like this
try{
mRecorder.prepare();
} catch (IOException e) {
Log.e(LOG_TAG, "prepare() failed");
System.out.println(""+e); //to display the error
}
mRecorder.start ();
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