MediaRecorder start failed: -38

问题

i searched to check if this question is no dup , i see some has no answer and others did not help.

this is my code :

private void startRecording()
{
            mRecorder = new MediaRecorder();
            mRecorder.setAudioSource(MediaRecorder.AudioSource.MIC);
            mRecorder.setOutputFormat(MediaRecorder.OutputFormat.THREE_GPP);
            mRecorder.setAudioEncoder(MediaRecorder.AudioEncoder.AMR_NB);

            mFileName = Environment.getExternalStorageDirectory().getAbsolutePath();
              mFileName += "/recordedHeckPost_.3gp";

            mRecorder.setOutputFile(mFileName);                  

                try {
                    mRecorder.prepare();
                    //Thread.sleep(2000);
                    mRecorder.start();                  
        }
                catch (InterruptedException e) 
                {   // TODO Auto-generated catch block
            e.printStackTrace();
        }     
            catch(IllegalStateException e)
            {
                e.printStackTrace();
            } catch (IOException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        }
}

private void stopRecording()
{
        mRecorder.stop();
        mRecorder.release();
        mRecorder = null;
}

After running this code (On Nexus 5) i get the below start failed -38 exception:

05-31 18:17:39.404: E/MediaRecorder(2464): start failed: -38
05-31 18:17:39.404: W/System.err(2464): java.lang.IllegalStateException
05-31 18:17:39.404: W/System.err(2464):     at android.media.MediaRecorder.start(Native Method)

Thanks.

回答1:

Found the solution , it appears i had some other service in the background which is using AudioRecord and uses the mic as well.... so thats the -38 :)

回答2:

In my case that error (MediaRecorder: start failed: -38) was appearing after switching to second camera when I forgot to release MediaRecorder during closing (first) camera:

mediaRecorder?.release()
mediaRecorder = null

来源：https://stackoverflow.com/questions/23971817/mediarecorder-start-failed-38