问题
I'm using FFmpegFrameRecorder for video broadcast.Problem is audio comes faster than video frame.I'm using following code but unable to produce complete video there is problem in audio video timestamp.
Java Code:
import static com.googlecode.javacv.cpp.opencv_core.IPL_DEPTH_8U;
import java.io.IOException;
import java.nio.ShortBuffer;
import android.app.Activity;
import android.content.Context;
import android.content.pm.ActivityInfo;
import android.graphics.Bitmap;
import android.graphics.Canvas;
import android.hardware.Camera;
import android.hardware.Camera.PreviewCallback;
import android.media.AudioFormat;
import android.media.AudioRecord;
import android.media.MediaRecorder;
import android.os.Bundle;
import android.os.PowerManager;
import android.util.Log;
import android.view.KeyEvent;
import android.view.SurfaceHolder;
import android.view.SurfaceView;
import android.view.View;
import android.view.View.OnClickListener;
import android.view.ViewGroup.LayoutParams;
import android.widget.Button;
import android.widget.LinearLayout;
import com.googlecode.javacv.FFmpegFrameRecorder;
import com.googlecode.javacv.cpp.opencv_core.IplImage;
public class MainActivity extends Activity implements OnClickListener {
private final static String LOG_TAG = "MainActivity";
private PowerManager.WakeLock mWakeLock;
private String ffmpeg_link = "";
private volatile FFmpegFrameRecorder recorder;
boolean recording = false;
long startTime = 0;
private int sampleAudioRateInHz = 16000;
private int imageWidth = 320;
private int imageHeight = 240;
private int frameRate = 24;
private Thread audioThread;
volatile boolean runAudioThread = true;
private AudioRecord audioRecord;
private AudioRecordRunnable audioRecordRunnable;
private CameraView cameraView;
private IplImage yuvIplimage = null;
private Button recordButton;
private LinearLayout mainLayout;
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setRequestedOrientation(ActivityInfo.SCREEN_ORIENTATION_LANDSCAPE);
setContentView(R.layout.activity_main);
initLayout();
initRecorder();
}
@Override
protected void onResume() {
super.onResume();
if (mWakeLock == null) {
PowerManager pm = (PowerManager) getSystemService(Context.POWER_SERVICE);
mWakeLock = pm.newWakeLock(PowerManager.SCREEN_BRIGHT_WAKE_LOCK,
LOG_TAG);
mWakeLock.acquire();
}
}
@Override
protected void onPause() {
super.onPause();
if (mWakeLock != null) {
mWakeLock.release();
mWakeLock = null;
}
}
@Override
protected void onDestroy() {
super.onDestroy();
recording = false;
}
private void initLayout() {
mainLayout = (LinearLayout) this.findViewById(R.id.record_layout);
recordButton = (Button) findViewById(R.id.recorder_control);
recordButton.setText("Start");
recordButton.setOnClickListener(this);
cameraView = new CameraView(this);
LinearLayout.LayoutParams layoutParam = new LinearLayout.LayoutParams(
LayoutParams.MATCH_PARENT, LayoutParams.MATCH_PARENT);
mainLayout.addView(cameraView, layoutParam);
Log.v(LOG_TAG, "added cameraView to mainLayout");
}
private void initRecorder() {
Log.w(LOG_TAG, "initRecorder");
if (yuvIplimage == null) {
// Recreated after frame size is set in surface change method
yuvIplimage = IplImage.create(imageWidth, imageHeight,
IPL_DEPTH_8U, 2);
// yuvIplimage = IplImage.create(imageWidth, imageHeight,
// IPL_DEPTH_32S, 2);
Log.v(LOG_TAG, "IplImage.create");
}
recorder = new FFmpegFrameRecorder(ffmpeg_link, imageWidth,
imageHeight, 1);
Log.v(LOG_TAG, "FFmpegFrameRecorder: " + ffmpeg_link + " imageWidth: "
+ imageWidth + " imageHeight " + imageHeight);
recorder.setFormat("flv");
Log.v(LOG_TAG, "recorder.setFormat(\"flv\")");
recorder.setSampleRate(sampleAudioRateInHz);
Log.v(LOG_TAG, "recorder.setSampleRate(sampleAudioRateInHz)");
// re-set in the surface changed method as well
recorder.setFrameRate(frameRate);
Log.v(LOG_TAG, "recorder.setFrameRate(frameRate)");
// Create audio recording thread
audioRecordRunnable = new AudioRecordRunnable();
audioThread = new Thread(audioRecordRunnable);
}
// Start the capture
public void startRecording() {
try {
recorder.start();
startTime = System.currentTimeMillis();
recording = true;
audioThread.start();
} catch (FFmpegFrameRecorder.Exception e) {
e.printStackTrace();
}
}
public void stopRecording() {
// This should stop the audio thread from running
runAudioThread = false;
if (recorder != null && recording) {
recording = false;
Log.v(LOG_TAG,
"Finishing recording, calling stop and release on recorder");
try {
recorder.stop();
recorder.release();
} catch (FFmpegFrameRecorder.Exception e) {
e.printStackTrace();
}
recorder = null;
}
}
@Override
public boolean onKeyDown(int keyCode, KeyEvent event) {
// Quit when back button is pushed
if (keyCode == KeyEvent.KEYCODE_BACK) {
if (recording) {
stopRecording();
}
finish();
return true;
}
return super.onKeyDown(keyCode, event);
}
@Override
public void onClick(View v) {
if (!recording) {
startRecording();
Log.w(LOG_TAG, "Start Button Pushed");
recordButton.setText("Stop");
} else {
stopRecording();
Log.w(LOG_TAG, "Stop Button Pushed");
recordButton.setText("Start");
}
}
// ---------------------------------------------
// audio thread, gets and encodes audio data
// ---------------------------------------------
class AudioRecordRunnable implements Runnable {
@Override
public void run() {
// Set the thread priority
android.os.Process
.setThreadPriority(android.os.Process.THREAD_PRIORITY_URGENT_AUDIO);
// Audio
int bufferSize;
short[] audioData;
int bufferReadResult;
bufferSize = AudioRecord.getMinBufferSize(sampleAudioRateInHz,
AudioFormat.CHANNEL_CONFIGURATION_MONO,
AudioFormat.ENCODING_PCM_16BIT);
audioRecord = new AudioRecord(MediaRecorder.AudioSource.MIC,
sampleAudioRateInHz,
AudioFormat.CHANNEL_CONFIGURATION_MONO,
AudioFormat.ENCODING_PCM_16BIT, bufferSize);
audioData = new short[bufferSize];
Log.d(LOG_TAG, "audioRecord.startRecording()");
audioRecord.startRecording();
// Audio Capture/Encoding Loop
while (runAudioThread) {
// Read from audioRecord
bufferReadResult = audioRecord.read(audioData, 0,
audioData.length);
if (bufferReadResult > 0) {
// Log.v(LOG_TAG,"audioRecord bufferReadResult: " +
// bufferReadResult);
// Changes in this variable may not be picked up despite it
// being "volatile"
if (recording) {
try {
// Write to FFmpegFrameRecorder
recorder.record(ShortBuffer.wrap(audioData, 0,
bufferReadResult));
} catch (FFmpegFrameRecorder.Exception e) {
Log.v(LOG_TAG, e.getMessage());
e.printStackTrace();
}
}
}
}
Log.v(LOG_TAG, "AudioThread Finished");
/* Capture/Encoding finished, release recorder */
if (audioRecord != null) {
audioRecord.stop();
audioRecord.release();
audioRecord = null;
Log.v(LOG_TAG, "audioRecord released");
}
}
}
class CameraView extends SurfaceView implements SurfaceHolder.Callback,
PreviewCallback {
private boolean previewRunning = false;
private SurfaceHolder holder;
private Camera camera;
private byte[] previewBuffer;
long videoTimestamp = 0;
Bitmap bitmap;
Canvas canvas;
public CameraView(Context _context) {
super(_context);
holder = this.getHolder();
holder.addCallback(this);
holder.setType(SurfaceHolder.SURFACE_TYPE_PUSH_BUFFERS);
}
@Override
public void surfaceCreated(SurfaceHolder holder) {
camera = Camera.open();
try {
camera.setPreviewDisplay(holder);
camera.setPreviewCallback(this);
Camera.Parameters currentParams = camera.getParameters();
Log.v(LOG_TAG,
"Preview Framerate: "
+ currentParams.getPreviewFrameRate());
Log.v(LOG_TAG,
"Preview imageWidth: "
+ currentParams.getPreviewSize().width
+ " imageHeight: "
+ currentParams.getPreviewSize().height);
// Use these values
imageWidth = currentParams.getPreviewSize().width;
imageHeight = currentParams.getPreviewSize().height;
frameRate = currentParams.getPreviewFrameRate();
bitmap = Bitmap.createBitmap(imageWidth, imageHeight,
Bitmap.Config.ALPHA_8);
/*
* Log.v(LOG_TAG,"Creating previewBuffer size: " + imageWidth *
* imageHeight *
* ImageFormat.getBitsPerPixel(currentParams.getPreviewFormat
* ())/8); previewBuffer = new byte[imageWidth * imageHeight *
* ImageFormat
* .getBitsPerPixel(currentParams.getPreviewFormat())/8];
* camera.addCallbackBuffer(previewBuffer);
* camera.setPreviewCallbackWithBuffer(this);
*/
camera.startPreview();
previewRunning = true;
} catch (IOException e) {
Log.v(LOG_TAG, e.getMessage());
e.printStackTrace();
}
}
public void surfaceChanged(SurfaceHolder holder, int format, int width,
int height) {
Log.v(LOG_TAG, "Surface Changed: width " + width + " height: "
+ height);
// We would do this if we want to reset the camera parameters
/*
* if (!recording) { if (previewRunning){ camera.stopPreview(); }
*
* try { //Camera.Parameters cameraParameters =
* camera.getParameters(); //p.setPreviewSize(imageWidth,
* imageHeight); //p.setPreviewFrameRate(frameRate);
* //camera.setParameters(cameraParameters);
*
* camera.setPreviewDisplay(holder); camera.startPreview();
* previewRunning = true; } catch (IOException e) {
* Log.e(LOG_TAG,e.getMessage()); e.printStackTrace(); } }
*/
// Get the current parameters
Camera.Parameters currentParams = camera.getParameters();
Log.v(LOG_TAG,
"Preview Framerate: " + currentParams.getPreviewFrameRate());
Log.v(LOG_TAG,
"Preview imageWidth: "
+ currentParams.getPreviewSize().width
+ " imageHeight: "
+ currentParams.getPreviewSize().height);
// Use these values
imageWidth = currentParams.getPreviewSize().width;
imageHeight = currentParams.getPreviewSize().height;
frameRate = currentParams.getPreviewFrameRate();
// Create the yuvIplimage if needed
yuvIplimage = IplImage.create(imageWidth, imageHeight,
IPL_DEPTH_8U, 1);
// yuvIplimage = IplImage.create(imageWidth, imageHeight,
// IPL_DEPTH_32S, 2);
}
@Override
public void surfaceDestroyed(SurfaceHolder holder) {
try {
camera.setPreviewCallback(null);
previewRunning = false;
camera.release();
} catch (RuntimeException e) {
Log.v(LOG_TAG, e.getMessage());
e.printStackTrace();
}
}
@Override
public void onPreviewFrame(byte[] data, Camera camera) {
if (yuvIplimage != null && recording) {
videoTimestamp = 1000 * (System.currentTimeMillis() - startTime);
// Put the camera preview frame right into the yuvIplimage
// object
System.out.println("value of data=============" + data);
yuvIplimage.getByteBuffer().put(data);
// FAQ about IplImage:
// - For custom raw processing of data, getByteBuffer() returns
// an NIO direct
// buffer wrapped around the memory pointed by imageData, and
// under Android we can
// also use that Buffer with Bitmap.copyPixelsFromBuffer() and
// copyPixelsToBuffer().
// - To get a BufferedImage from an IplImage, we may call
// getBufferedImage().
// - The createFrom() factory method can construct an IplImage
// from a BufferedImage.
// - There are also a few copy*() methods for
// BufferedImage<->IplImage data transfers.
// Let's try it..
// This works but only on transparency
// Need to find the right Bitmap and IplImage matching types
/*
* bitmap.copyPixelsFromBuffer(yuvIplimage.getByteBuffer());
* //bitmap.setPixel(10,10,Color.MAGENTA);
*
* canvas = new Canvas(bitmap); Paint paint = new Paint();
* paint.setColor(Color.GREEN); float leftx = 20; float topy =
* 20; float rightx = 50; float bottomy = 100; RectF rectangle =
* new RectF(leftx,topy,rightx,bottomy);
* canvas.drawRect(rectangle, paint);
*
* bitmap.copyPixelsToBuffer(yuvIplimage.getByteBuffer());
*/
// Log.v(LOG_TAG,"Writing Frame");
try {
// Get the correct time
recorder.setTimestamp(videoTimestamp);
// Record the image into FFmpegFrameRecorder
recorder.record(yuvIplimage);
} catch (FFmpegFrameRecorder.Exception e) {
Log.v(LOG_TAG, e.getMessage());
e.printStackTrace();
}
}
}
}
}
Manifest
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
package="com.example.javacv.stream.test2"
android:versionCode="1"
android:versionName="1.0" >
<uses-sdk
android:minSdkVersion="8"
android:targetSdkVersion="15" />
<uses-permission android:name="android.permission.INTERNET" />
<uses-permission android:name="android.permission.CAMERA" />
<uses-permission android:name="android.permission.WAKE_LOCK" />
<uses-permission android:name="android.permission.RECORD_AUDIO" />
<uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE" />
<application
android:icon="@drawable/ic_launcher"
android:label="@string/app_name"
android:theme="@style/AppTheme" >
<activity
android:name="com.example.javacv.stream.test2.MainActivity"
android:label="@string/title_activity_main" >
<intent-filter>
<action android:name="android.intent.action.MAIN" />
<category android:name="android.intent.category.LAUNCHER" />
</intent-filter>
</activity>
</application>
</manifest>
回答1:
This is a known issue we battled with on the iOS side as well.. Basically the packets for video get dropped while the audio keeps going, and it all goes to hell. Some hardware under low bandwidth just doesn't play nice and goes out of sync.. I don't believe there is a solid fix, we had to hack it by building our own buffer on top for the audio/video and re-synchronizing using timestamps, frame sizes, and packet counts.
Afraid I can't post that code (it's not mine to post) but if you know the protocol, shouldn't be hard to recreate..
来源：https://stackoverflow.com/questions/22342732/ffmpegframerecorder-videobroadcasting-audio-comes-faster-than-video-frame-in-3g