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• Android FFmpegPlayer Streaming Service onClick notification

  8 octobre 2013, par agony

  I have a MainActivity class that displays the list of streams available for my project and the StreamingActivity class where the streaming is done.

  If the user selected an item from the list it will start the StreamingActivity and start playing the stream.
  I'm having trouble to continue streaming music when the user pressed the notification and returning it to the StreamingActivity class if the user pressed or clicked the home menu or when the app goes to onDestroy().

  I'm using FFmpegPlayer for my project 'coz it requires to play mms :// live streams for local FM station.

  Here's my code :

  public class StreamingActivity extends BaseActivity  implements ActionBar.TabListener,
  
  PlayerControlListener, IMediaPlayerServiceClient {
  
  
  
  
  
  private StatefulMediaPlayer mMediaPlayer;
  
  private FFmpegService mService;
  
  private boolean mBound;
  
  
  
  public static final String TAG = "StationActivity";
  
  
  
  private static Bundle mSavedInstanceState;
  
  
  
  private static PlayerFragment mPlayerFragment;
  
  private static DJListFragment mDjListFragment;
  
  
  
  private SectionsPagerAdapter mSectionsPagerAdapter;
  
  private ViewPager mViewPager;
  
  
  
  private String stream = "";
  
  private String fhz = "";
  
  private String page = "0";
  
  
  
  private Dialog shareDialog;
  
      private ProgressDialog dialog;
  
  
  
  private boolean isStreaming;
  
  
  
  
  
  /*************************************************************************************************************/
  
  
  
  @Override
  
  public void onCreate(Bundle savedInstanceState){
  
      super.onCreate(savedInstanceState);
  
      setContentView(R.layout.activity_station);
  
  
  
      Bundle bundle = getIntent().getExtras();
  
      if(bundle !=null){
  
          fhz = bundle.getString("fhz");
  
          stream = bundle.getString("stream");
  
      } 
  
  
  
      Log.d(TAG, "page: " + page + " fhz: " + fhz + " stream: " + stream + " isStreaming: " + isStreaming);
  
  
  
      getSupportActionBar().setTitle("Radio \n" + fhz);
  
      getSupportActionBar().setDisplayHomeAsUpEnabled(true);
  
      getSupportActionBar().setNavigationMode(ActionBar.NAVIGATION_MODE_TABS);
  
  
  
      mPlayerFragment = (PlayerFragment) Fragment.instantiate(this, PlayerFragment.class.getName(), null);
  
      mDjListFragment = (DJListFragment) Fragment.instantiate(this, DJListFragment.class.getName(), null);
  
  
  
      mSectionsPagerAdapter = new SectionsPagerAdapter(getSupportFragmentManager());
  
  
  
      mViewPager = (ViewPager) findViewById(R.id.pager);
  
      mViewPager.setAdapter(mSectionsPagerAdapter);
  
      mViewPager.setCurrentItem(Integer.parseInt(page));
  
  
  
      mSavedInstanceState = savedInstanceState;
  
  
  
      Tab playingTab = getSupportActionBar().newTab();
  
      playingTab.setText(getString(R.string.playing_label));
  
      playingTab.setTabListener(this);
  
  
  
      Tab djTab = getSupportActionBar().newTab();
  
      djTab.setText(getString(R.string.dj_label));
  
      djTab.setTabListener(this);
  
  
  
      getSupportActionBar().addTab(playingTab);
  
      getSupportActionBar().addTab(djTab);
  
  
  
      // When swiping between different sections, select the corresponding
  
      // tab. We can also use ActionBar.Tab#select() to do this if we have
  
      // a reference to the Tab.
  
      mViewPager.setOnPageChangeListener(new ViewPager.SimpleOnPageChangeListener() {
  
          @Override
  
          public void onPageSelected(int position) {
  
              StationActivity.this.getSupportActionBar().setSelectedNavigationItem(position);
  
          }
  
      });
  
  
  
      if (mSavedInstanceState != null) {
  
          getSupportActionBar().setSelectedNavigationItem(mSavedInstanceState.getInt("tab", 0));
  
      }
  
  
  
      dialog = new ProgressDialog(this);
  
  
  
      bindToService();
  
  
  
      UriBean.getInstance().setStream(stream);
  
      Log.d(TAG ,"stream: " + UriBean.getInstance().getStream());
  
  
  
  }
  
  
  
  /********************************************************************************************************/
  
  
  
  public class SectionsPagerAdapter extends FragmentPagerAdapter {
  
      public SectionsPagerAdapter(FragmentManager fm) {
  
          super(fm);
  
      }
  
  
  
      @Override
  
      public Fragment getItem(int position) {
  
          if (position == 0) {
  
              return mPlayerFragment;
  
          } else {
  
              return mDjListFragment;
  
          }
  
      }
  
  
  
      @Override
  
      public int getCount() {
  
          return 2;
  
      }
  
  }
  
  
  
  @Override
  
  public void onTabSelected(Tab tab, FragmentTransaction ft) {
  
      // When the given tab is selected, switch to the corresponding page in the ViewPager.
  
      mViewPager.setCurrentItem(tab.getPosition());
  
  }
  
  
  
  @Override
  
  public void onTabUnselected(Tab tab, FragmentTransaction ft) { }
  
  
  
  @Override
  
  public void onTabReselected(Tab tab, FragmentTransaction ft) { }
  
  
  
  /********************************************************************************************************/
  
  
  
  public void showLoadingDialog() {
  
      dialog.setMessage("Buffering...");
  
      dialog.show();
  
  }
  
  
  
  public void dismissLoadingDialog() {
  
      dialog.dismiss();
  
  }
  
  
  
  /********************************************************************************************************/
  
  
  
  /**
  
   * Binds to the instance of MediaPlayerService. If no instance of MediaPlayerService exists, it first starts
  
   * a new instance of the service.
  
   */
  
  public void bindToService() {
  
      Intent intent = new Intent(this, FFmpegService.class);
  
  
  
      if (Util.isFFmpegServiceRunning(getApplicationContext())){
  
          // Bind to Service
  
          Log.i(TAG, "bindService");
  
          bindService(intent, mConnection, Context.BIND_AUTO_CREATE);
  
      } else {
  
          //start service and bind to it
  
          Log.i(TAG, "startService & bindService");
  
          startService(intent);
  
          bindService(intent, mConnection, Context.BIND_AUTO_CREATE);
  
      }
  
  }
  
  
  
  
  
  /** 
  
   * Defines callbacks for service binding, passed to bindService()
  
   */
  
  private ServiceConnection mConnection = new ServiceConnection() {
  
      @Override
  
      public void onServiceConnected(ComponentName className, IBinder serviceBinder) {
  
          Log.d(TAG,"service connected");
  
  
  
          //bound with Service. get Service instance
  
          MediaPlayerBinder binder = (FFmpegService.MediaPlayerBinder) serviceBinder;
  
          mService = binder.getService();
  
  
  
          //send this instance to the service, so it can make callbacks on this instance as a client
  
          mService.setClient(StationActivity.this);
  
          mBound = true;
  
  
  
          Log.d(TAG, "isPlaying === SERVICE: " + mService.isPlaying());
  
  
  
          //if
  
  
  
          startStreaming();
  
      }
  
  
  
      @Override
  
      public void onServiceDisconnected(ComponentName arg0) {
  
          mBound = false;
  
          mService = null;
  
      }
  
  };
  
  
  
  /********************************************************************************************************/
  
  
  
  @Override
  
  public void onPlayerPlayStop() {
  
      Log.d(TAG, "onPlayerPlayStop");
  
  
  
      Log.v(TAG, "isStreaming: " + isStreaming);
  
      Log.v(TAG, "mBound:  " + mBound);
  
  
  
      if (mBound) {
  
          Log.d(TAG, "bound.............");
  
          mMediaPlayer = mService.getMediaPlayer();
  
          //pressed pause ->pause
  
          if (!PlayerFragment.play.isChecked()) {
  
              if (mMediaPlayer.isStarted()) {
  
                  Log.d(TAG, "pause");
  
                  mService.pauseMediaPlayer();
  
              }
  
          } else { //pressed play
  
              // STOPPED, CREATED, EMPTY, -> initialize
  
              if (mMediaPlayer.isStopped() || mMediaPlayer.isCreated() || mMediaPlayer.isEmpty()) {
  
                  startStreaming();
  
              } else if (mMediaPlayer.isPrepared() || mMediaPlayer.isPaused()) { //prepared, paused -> resume play
  
                  Log.d(TAG, "start");
  
                  mService.startMediaPlayer();
  
              }
  
          }
  
  
  
          Log.d(TAG, "isPlaying === SERVICE: " + mService.isPlaying());
  
      } 
  
  }
  
  
  
  /********************************************************************************************************/
  
  
  
  @Override
  
  public void onDownload() {
  
      Toast.makeText(this, "Not yet available...", Toast.LENGTH_SHORT).show();
  
  }
  
  
  
  @Override
  
  public void onComment() {
  
      FragmentManager fm = getSupportFragmentManager();
  
      DialogFragment newFragment = MyAlertDialogFragment.newInstance();
  
      newFragment.show(fm, "comment_dialog");
  
  }
  
  
  
  @Override
  
  public void onShare() {
  
      showShareDialog();
  
  }
  
  
  
  /********************************************************************************************************/
  
  
  
  private void startStreaming() {
  
      Log.d(TAG, "@startLoading");
  
      boolean isNetworkFound = Util.checkConnectivity(getApplicationContext());
  
      if(isNetworkFound) {
  
          Log.d(TAG, "network found");
  
          mService.initializePlayer(stream);
  
          isStreaming = true;
  
      } else {
  
          Toast.makeText(getApplicationContext(), "No internet connection found...", Toast.LENGTH_SHORT).show();
  
      }
  
  
  
      Log.d(TAG, "isStreaming: " + isStreaming);
  
      Log.d(TAG, "isPlaying === SERVICE: " + mService.isPlaying());
  
  }
  
  
  
  @Override
  
  public void onInitializePlayerStart() {
  
      showLoadingDialog();
  
  }
  
  
  
  @Override
  
  public void onInitializePlayerSuccess() {
  
      dismissLoadingDialog();
  
      PlayerFragment.play.setChecked(true);
  
  
  
  
  
      Log.d(TAG, "isPlaying === SERVICE: " + mService.isPlaying());
  
  }
  
  
  
  @Override
  
  public void onError() {
  
      Toast.makeText(getApplicationContext(), "Not connected to the server...", Toast.LENGTH_SHORT).show();
  
  }
  
  
  
      @Override
  
  public void onDestroy() {
  
      Log.d(TAG, "onDestroy");
  
      super.onDestroy();
  
      uiHelper.onDestroy();
  
  
  
      Log.d(TAG, "isPlaying === SERVICE: " + mService.isPlaying());
  
      if (mBound) {
  
          mService.unRegister();
  
          unbindService(mConnection);
  
          mBound = false;
  
      }
  
  
  
      Log.d(TAG, "service: " + Util.isFFmpegServiceRunning(getApplicationContext()));
  
  }
  
  
  
  @Override
  
  public void onStop(){
  
      Log.d(TAG, "onStop");
  
      super.onStop();
  
  }
  
  
  
  /*******************************************************************************************************/
  
  
  
  @Override
  
  public boolean onOptionsItemSelected(MenuItem item) {
  
      int itemId = item.getItemId();
  
      switch (itemId){
  
      case android.R.id.home:
  
          onBackPressed();
  
          break;
  
      default:
  
          break;
  
      }    
  
      return true;
  
  }
  
  
  
  @Override
  
  public boolean onKeyDown(int keyCode, KeyEvent event) {
  
      Log.d(TAG, "@onKeyDown");
  
      if (keyCode == KeyEvent.KEYCODE_BACK && event.getRepeatCount() == 0){
  
          //this.moveTaskToBack(true);
  
          onBackPressed();
  
          return true;
  
      }
  
      return super.onKeyDown(keyCode, event);
  
  }
  
  }
  
  
  
  
  
  
  
  
  
  
  
  
  
  public class FFmpegService  extends Service implements IMediaPlayerThreadClient {
  
  
  
  private FFmpegPlayerThread mMediaPlayerThread       = new FFmpegPlayerThread(this);
  
  private final Binder mBinder                        = new MediaPlayerBinder();
  
  private IMediaPlayerServiceClient mClient;
  
  //private StreamStation mCurrentStation;
  
  
  
  private boolean mIsSupposedToBePlaying = false;
  
  
  
  private boolean isPausedInCall = false;
  
  private PhoneStateListener phoneStateListener;
  
  private TelephonyManager telephonyManager;
  
  
  
  @Override
  
  public void onCreate(){
  
      mMediaPlayerThread.start();
  
  }
  
  
  
  /**
  
   * A class for clients binding to this service. The client will be passed an object of this class
  
   * via its onServiceConnected(ComponentName, IBinder) callback.
  
   */
  
  public class MediaPlayerBinder extends Binder {
  
      /**
  
       * Returns the instance of this service for a client to make method calls on it.
  
       * @return the instance of this service.
  
       */
  
      public FFmpegService getService() {
  
          return FFmpegService.this;
  
      }
  
  }
  
  
  
  /**
  
   * Returns the contained StatefulMediaPlayer
  
   * @return
  
   */
  
  public StatefulMediaPlayer getMediaPlayer() {
  
      return mMediaPlayerThread.getMediaPlayer();
  
  }
  
  
  
  public boolean isPlaying() {
  
      return mIsSupposedToBePlaying;
  
  }
  
  
  
  @Override
  
  public IBinder onBind(Intent arg0) {
  
      return mBinder;
  
  }
  
  
  
  @Override
  
  public int onStartCommand(Intent intent, int flags, int startId) {
  
  
  
      telephonyManager = (TelephonyManager) getSystemService(Context.TELEPHONY_SERVICE);
  
      phoneStateListener = new PhoneStateListener() {
  
          @Override
  
          public void onCallStateChanged(int state, String incomingNumber) {
  
              // String stateString = "N/A";
  
              Log.v("FFmpegService", "Starting CallStateChange");
  
              switch (state) {
  
              case TelephonyManager.CALL_STATE_OFFHOOK:
  
              case TelephonyManager.CALL_STATE_RINGING:
  
                  if (mMediaPlayerThread != null) {
  
                      pauseMediaPlayer();
  
                      isPausedInCall = true;
  
                  }
  
                  break;
  
              case TelephonyManager.CALL_STATE_IDLE:
  
                  // Phone idle. Start playing.
  
                  if (mMediaPlayerThread != null) {
  
                      if (isPausedInCall) {
  
                          isPausedInCall = false;
  
                          startMediaPlayer();
  
                      }
  
                  }
  
                  break;
  
              }
  
          }
  
      };
  
  
  
      // Register the listener with the telephony manager
  
      telephonyManager.listen(phoneStateListener, PhoneStateListener.LISTEN_CALL_STATE);
  
  
  
      return START_STICKY;
  
  }
  
  
  
  /**
  
   * Sets the client using this service.
  
   * @param client The client of this service, which implements the IMediaPlayerServiceClient interface
  
   */
  
  public void setClient(IMediaPlayerServiceClient client) {
  
      this.mClient = client;
  
  }
  
  
  
  
  
  public void initializePlayer(final String station) {
  
      //mCurrentStation = station;
  
      mMediaPlayerThread.initializePlayer(station);
  
  }
  
  
  
  public void startMediaPlayer() {
  
  
  
      Intent notificationIntent = new Intent(getApplicationContext(), StreamingActivity.class);
  
      //notificationIntent.putExtra("page", "0");
  
      //notificationIntent.putExtra("isPlaying", isPlaying());
  
      notificationIntent.addFlags(Intent.FLAG_ACTIVITY_SINGLE_TOP | Intent.FLAG_ACTIVITY_CLEAR_TOP);
  
      PendingIntent contentIntent = PendingIntent.getActivity(getApplicationContext(), 0 , notificationIntent , PendingIntent.FLAG_UPDATE_CURRENT);
  
  
  
      NotificationCompat.Builder mBuilder = new NotificationCompat.Builder(this)
  
              .setSmallIcon(R.drawable.ic_launcher)
  
              .setContentTitle("You are listening to Radio...")
  
              .setContentText("test!!!")
  
              .setContentIntent(contentIntent);
  
  
  
      startForeground(1, mBuilder.build());
  
  
  
      NotificationManager notificationManager = (NotificationManager) getSystemService(Context.NOTIFICATION_SERVICE);
  
      notificationManager.notify(1, mBuilder.build());
  
  
  
      mIsSupposedToBePlaying = true;
  
      mMediaPlayerThread.startMediaPlayer();
  
  }
  
  
  
  public void dismissNotification(Context context) {
  
      String ns = Context.NOTIFICATION_SERVICE;
  
      NotificationManager mNotificationManager = (NotificationManager) getSystemService(ns);
  
      mNotificationManager.cancel(1);
  
  }
  
  
  
  /**
  
   * Pauses playback
  
   */
  
  public void pauseMediaPlayer() {
  
      Log.d("MediaPlayerService","pauseMediaPlayer() called");
  
      mMediaPlayerThread.pauseMediaPlayer();
  
      stopForeground(true);
  
      mIsSupposedToBePlaying = false;
  
      dismissNotification(this);
  
  }
  
  /**
  
   * Stops playback
  
   */
  
  public void stopMediaPlayer() { 
  
      stopForeground(true);
  
      mMediaPlayerThread.stopMediaPlayer();
  
  
  
      mIsSupposedToBePlaying = false;
  
      dismissNotification(this);
  
  }
  
  
  
  public void resetMediaPlayer() {
  
      mIsSupposedToBePlaying = false;
  
      stopForeground(true);
  
      mMediaPlayerThread.resetMediaPlayer();
  
      dismissNotification(this);
  
  }
  
  
  
  @Override
  
  public void onError() {
  
      mIsSupposedToBePlaying = false;
  
      mClient.onError();
  
      dismissNotification(this);
  
  }
  
  
  
  @Override
  
  public void onInitializePlayerStart() {
  
      mClient.onInitializePlayerStart();
  
  }
  
  
  
  @Override
  
  public void onInitializePlayerSuccess() {
  
      startMediaPlayer();
  
      mClient.onInitializePlayerSuccess();
  
      mIsSupposedToBePlaying = true;
  
  }
  
  
  
  public void unRegister() {
  
      this.mClient = null;
  
      mIsSupposedToBePlaying = false;
  
      dismissNotification(this);
  
  }
  
  
  
  }

  Hoping someone can help me here...

• encoding XDCAM MXF with FFMPEG

  9 octobre 2013, par magingax

  Trying to encode XDCAM HD422 MXF with FFMPEG
  But can't know specific setting for encoder/format/mux
  Anyone can show me sample code or give some advice for that ?

• Trouble syncing libavformat/ffmpeg with x264 and RTP

  26 décembre 2012, par Jacob Peddicord

  I've been working on some streaming software that takes live feeds
  from various kinds of cameras and streams over the network using
  H.264. To accomplish this, I'm using the x264 encoder directly (with
  the "zerolatency" preset) and feeding NALs as they are available to
  libavformat to pack into RTP (ultimately RTSP). Ideally, this
  application should be as real-time as possible. For the most part,
  this has been working well.

  Unfortunately, however, there is some sort of synchronization issue :
  any video playback on clients seems to show a few smooth frames,
  followed by a short pause, then more frames ; repeat. Additionally,
  there appears to be approximately a 4-second delay. This happens with
  every video player I've tried : Totem, VLC, and basic gstreamer pipes.

  I've boiled it all down to a somewhat small test case :

  #include 
  
  #include 
  
  #include 
  
  #include 
  
  #include <libavformat></libavformat>avformat.h>
  
  #include <libswscale></libswscale>swscale.h>
  
  
  
  #define WIDTH       640
  
  #define HEIGHT      480
  
  #define FPS         30
  
  #define BITRATE     400000
  
  #define RTP_ADDRESS "127.0.0.1"
  
  #define RTP_PORT    49990
  
  
  
  struct AVFormatContext* avctx;
  
  struct x264_t* encoder;
  
  struct SwsContext* imgctx;
  
  
  
  uint8_t test = 0x80;
  
  
  
  
  
  void create_sample_picture(x264_picture_t* picture)
  
  {
  
      // create a frame to store in
  
      x264_picture_alloc(picture, X264_CSP_I420, WIDTH, HEIGHT);
  
  
  
      // fake image generation
  
      // disregard how wrong this is; just writing a quick test
  
      int strides = WIDTH / 8;
  
      uint8_t* data = malloc(WIDTH * HEIGHT * 3);
  
      memset(data, test, WIDTH * HEIGHT * 3);
  
      test = (test &lt;&lt; 1) | (test >> (8 - 1));
  
  
  
      // scale the image
  
      sws_scale(imgctx, (const uint8_t* const*) &amp;data, &amp;strides, 0, HEIGHT,
  
                picture->img.plane, picture->img.i_stride);
  
  }
  
  
  
  int encode_frame(x264_picture_t* picture, x264_nal_t** nals)
  
  {
  
      // encode a frame
  
      x264_picture_t pic_out;
  
      int num_nals;
  
      int frame_size = x264_encoder_encode(encoder, nals, &amp;num_nals, picture, &amp;pic_out);
  
  
  
      // ignore bad frames
  
      if (frame_size &lt; 0)
  
      {
  
          return frame_size;
  
      }
  
  
  
      return num_nals;
  
  }
  
  
  
  void stream_frame(uint8_t* payload, int size)
  
  {
  
      // initalize a packet
  
      AVPacket p;
  
      av_init_packet(&amp;p);
  
      p.data = payload;
  
      p.size = size;
  
      p.stream_index = 0;
  
      p.flags = AV_PKT_FLAG_KEY;
  
      p.pts = AV_NOPTS_VALUE;
  
      p.dts = AV_NOPTS_VALUE;
  
  
  
      // send it out
  
      av_interleaved_write_frame(avctx, &amp;p);
  
  }
  
  
  
  int main(int argc, char* argv[])
  
  {
  
      // initalize ffmpeg
  
      av_register_all();
  
  
  
      // set up image scaler
  
      // (in-width, in-height, in-format, out-width, out-height, out-format, scaling-method, 0, 0, 0)
  
      imgctx = sws_getContext(WIDTH, HEIGHT, PIX_FMT_MONOWHITE,
  
                              WIDTH, HEIGHT, PIX_FMT_YUV420P,
  
                              SWS_FAST_BILINEAR, NULL, NULL, NULL);
  
  
  
      // set up encoder presets
  
      x264_param_t param;
  
      x264_param_default_preset(&amp;param, "ultrafast", "zerolatency");
  
  
  
      param.i_threads = 3;
  
      param.i_width = WIDTH;
  
      param.i_height = HEIGHT;
  
      param.i_fps_num = FPS;
  
      param.i_fps_den = 1;
  
      param.i_keyint_max = FPS;
  
      param.b_intra_refresh = 0;
  
      param.rc.i_bitrate = BITRATE;
  
      param.b_repeat_headers = 1; // whether to repeat headers or write just once
  
      param.b_annexb = 1;         // place start codes (1) or sizes (0)
  
  
  
      // initalize
  
      x264_param_apply_profile(&amp;param, "high");
  
      encoder = x264_encoder_open(&amp;param);
  
  
  
      // at this point, x264_encoder_headers can be used, but it has had no effect
  
  
  
      // set up streaming context. a lot of error handling has been ommitted
  
      // for brevity, but this should be pretty standard.
  
      avctx = avformat_alloc_context();
  
      struct AVOutputFormat* fmt = av_guess_format("rtp", NULL, NULL);
  
      avctx->oformat = fmt;
  
  
  
      snprintf(avctx->filename, sizeof(avctx->filename), "rtp://%s:%d", RTP_ADDRESS, RTP_PORT);
  
      if (url_fopen(&amp;avctx->pb, avctx->filename, URL_WRONLY) &lt; 0)
  
      {
  
          perror("url_fopen failed");
  
          return 1;
  
      }
  
      struct AVStream* stream = av_new_stream(avctx, 1);
  
  
  
      // initalize codec
  
      AVCodecContext* c = stream->codec;
  
      c->codec_id = CODEC_ID_H264;
  
      c->codec_type = AVMEDIA_TYPE_VIDEO;
  
      c->flags = CODEC_FLAG_GLOBAL_HEADER;
  
      c->width = WIDTH;
  
      c->height = HEIGHT;
  
      c->time_base.den = FPS;
  
      c->time_base.num = 1;
  
      c->gop_size = FPS;
  
      c->bit_rate = BITRATE;
  
      avctx->flags = AVFMT_FLAG_RTP_HINT;
  
  
  
      // write the header
  
      av_write_header(avctx);
  
  
  
      // make some frames
  
      for (int frame = 0; frame &lt; 10000; frame++)
  
      {
  
          // create a sample moving frame
  
          x264_picture_t* pic = (x264_picture_t*) malloc(sizeof(x264_picture_t));
  
          create_sample_picture(pic);
  
  
  
          // encode the frame
  
          x264_nal_t* nals;
  
          int num_nals = encode_frame(pic, &amp;nals);
  
  
  
          if (num_nals &lt; 0)
  
              printf("invalid frame size: %d\n", num_nals);
  
  
  
          // send out NALs
  
          for (int i = 0; i &lt; num_nals; i++)
  
          {
  
              stream_frame(nals[i].p_payload, nals[i].i_payload);
  
          }
  
  
  
          // free up resources
  
          x264_picture_clean(pic);
  
          free(pic);
  
  
  
          // stream at approx 30 fps
  
          printf("frame %d\n", frame);
  
          usleep(33333);
  
      }
  
  
  
      return 0;
  
  }

  This test shows black lines on a white background that
  should move smoothly to the left. It has been written for ffmpeg 0.6.5
  but the problem can be reproduced on 0.8 and 0.10 (from what I've tested so far). I've taken some shortcuts in error handling to make this example as short as
  possible while still showing the problem, so please excuse some of the
  nasty code. I should also note that while an SDP is not used here, I
  have tried using that already with similar results. The test can be
  compiled with :

  gcc -g -std=gnu99 streamtest.c -lswscale -lavformat -lx264 -lm -lpthread -o streamtest

  It can be played with gtreamer directly :

  gst-launch udpsrc port=49990 ! application/x-rtp,payload=96,clock-rate=90000 ! rtph264depay ! decodebin ! xvimagesink

  You should immediately notice the stuttering. One common "fix" I've
  seen all over the Internet is to add sync=false to the pipeline :

  gst-launch udpsrc port=49990 ! application/x-rtp,payload=96,clock-rate=90000 ! rtph264depay ! decodebin ! xvimagesink sync=false

  This causes playback to be smooth (and near-realtime), but is a
  non-solution and only works with gstreamer. I'd like to fix the
  problem at the source. I've been able to stream with near-identical
  parameters using raw ffmpeg and haven't had any issues :

  ffmpeg -re -i sample.mp4 -vcodec libx264 -vpre ultrafast -vpre baseline -b 400000 -an -f rtp rtp://127.0.0.1:49990 -an

  So clearly I'm doing something wrong. But what is it ?