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• How to properly open libvpx for encoding in via avcodec_open2() ?

  10 juin 2014, par Edison

  With a valid AVCodec and a valid AVContext, when calling avcodec_open2() EINVAL (-22, Invalid arguments) is returned, it turns out the EINVAL is triggered via

      ret = avctx->codec->init(avctx);
  
      if (ret < 0) {
  
          goto free_and_end;
  
      }

  inside avcodec_open2().

  The same code that I have right now can open mpeg4 and h264 just fine.

  Are there any special option parameters that has to be set (e.g. for h263, image size has to be multiples of certain numbers) to open libvpx codec ?

• Open-source segmenter for HTTP streaming

  28 septembre 2012, par Publiccert

  So, I'm trying to build a segmenter for Linux.

  There are a few linked in this thread : HTTP Live Streaming, FFMPEG & FFSERVER, and iPhone OS 3

  However, the only functional one seems to be for Windows. I've tried following this guide and the svn link : http://www.ioncannon.net/programming/452/iphone-http-streaming-with-ffmpeg-and-an-open-source-segmenter/ with no success either. I can't get that segmenter to work either.

  Does any know of a good, stable, opensource segmenter. We're hoping to feed our rtmp(via Red5) stream into ffmpeg and crank it out over http, if that matters to anyone. Thanks !

• Getting exception while loading ffmpeg library

  16 septembre 2012, par user1662334

  I am using ffmpeg library in one of my sample project.I have compiled it successfully,but while loading the library,i am getting the exception that this library is not found.

  This is the Android.mk code :

  LOCAL_PATH := $(call my-dir)
  
  
  
  include $(CLEAR_VARS)
  
  
  
  LOCAL_MODULE    := ffmpegutils
  
  LOCAL_SRC_FILES := native.c
  
  
  
  LOCAL_C_INCLUDES := $(LOCAL_PATH)/include
  
  LOCAL_LDLIBS := -L$(NDK_PLATFORMS_ROOT)/$(TARGET_PLATFORM)/arch-arm/usr/lib -L$(LOCAL_PATH) -lavformat -lavcodec -lavdevice -lavfilter -lavcore -lavutil -lswscale -llog -ljnigraphics -lz -ldl -lgcc
  
  
  
  include $(BUILD_SHARED_LIBRARY)

  This is the code :

  public class MainActivity extends Activity {
  
      private static native void openFile();
  
      private static native void drawFrame(Bitmap bitmap);
  
      private static native void drawFrameAt(Bitmap bitmap, int secs);
  
  
  
      private Bitmap mBitmap;
  
      private int mSecs = 0;
  
  
  
      static {
  
          System.loadLibrary("ffmpegutils");
  
      }
  
  
  
      /** Called when the activity is first created. */
  
      @Override
  
      public void onCreate(Bundle savedInstanceState) {
  
          super.onCreate(savedInstanceState);
  
          //setContentView(new VideoView(this));
  
          setContentView(R.layout.main);
  
  
  
          mBitmap = Bitmap.createBitmap(320, 240, Bitmap.Config.ARGB_8888);
  
          openFile();
  
  
  
          Button btn = (Button)findViewById(R.id.frame_adv);
  
          btn.setOnClickListener(new OnClickListener() {
  
              public void onClick(View v) {
  
                  drawFrame(mBitmap);
  
                  ImageView i = (ImageView)findViewById(R.id.frame);
  
                  i.setImageBitmap(mBitmap);
  
              }
  
          });
  
  
  
          Button btn_fwd = (Button)findViewById(R.id.frame_fwd);
  
          btn_fwd.setOnClickListener(new OnClickListener() {
  
              public void onClick(View v) {
  
                  mSecs += 5;
  
                  drawFrameAt(mBitmap, mSecs);
  
                  ImageView i = (ImageView)findViewById(R.id.frame);
  
                  i.setImageBitmap(mBitmap);
  
              }
  
          });
  
  
  
          Button btn_back = (Button)findViewById(R.id.frame_back);
  
          btn_back.setOnClickListener(new OnClickListener() {
  
              public void onClick(View v) {
  
                  mSecs -= 5;
  
                  drawFrameAt(mBitmap, mSecs);
  
                  ImageView i = (ImageView)findViewById(R.id.frame);
  
                  i.setImageBitmap(mBitmap);
  
              }
  
          });
  
      }
  
  }

  This is the exception :

  09-16 15:00:06.272: E/AndroidRuntime(392): Uncaught handler: thread main exiting due to uncaught exception
  
  09-16 15:00:06.291: E/AndroidRuntime(392): java.lang.ExceptionInInitializerError
  
  09-16 15:00:06.291: E/AndroidRuntime(392):  at java.lang.Class.newInstanceImpl(Native Method)
  
  09-16 15:00:06.291: E/AndroidRuntime(392):  at java.lang.Class.newInstance(Class.java:1479)
  
  09-16 15:00:06.291: E/AndroidRuntime(392):  at android.app.Instrumentation.newActivity(Instrumentation.java:1021)
  
  09-16 15:00:06.291: E/AndroidRuntime(392):  at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2409)
  
  09-16 15:00:06.291: E/AndroidRuntime(392):  at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2512)
  
  09-16 15:00:06.291: E/AndroidRuntime(392):  at android.app.ActivityThread.access$2200(ActivityThread.java:119)
  
  09-16 15:00:06.291: E/AndroidRuntime(392):  at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1863)
  
  09-16 15:00:06.291: E/AndroidRuntime(392):  at android.os.Handler.dispatchMessage(Handler.java:99)
  
  09-16 15:00:06.291: E/AndroidRuntime(392):  at android.os.Looper.loop(Looper.java:123)
  
  09-16 15:00:06.291: E/AndroidRuntime(392):  at android.app.ActivityThread.main(ActivityThread.java:4363)
  
  09-16 15:00:06.291: E/AndroidRuntime(392):  at java.lang.reflect.Method.invokeNative(Native Method)
  
  09-16 15:00:06.291: E/AndroidRuntime(392):  at java.lang.reflect.Method.invoke(Method.java:521)
  
  09-16 15:00:06.291: E/AndroidRuntime(392):  at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:860)
  
  09-16 15:00:06.291: E/AndroidRuntime(392):  at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:618)
  
  09-16 15:00:06.291: E/AndroidRuntime(392):  at dalvik.system.NativeStart.main(Native Method)
  
  09-16 15:00:06.291: E/AndroidRuntime(392): Caused by: java.lang.UnsatisfiedLinkError: Library ffmpegutils not found
  
  09-16 15:00:06.291: E/AndroidRuntime(392):  at java.lang.Runtime.loadLibrary(Runtime.java:489)
  
  09-16 15:00:06.291: E/AndroidRuntime(392):  at java.lang.System.loadLibrary(System.java:557)
  
  09-16 15:00:06.291: E/AndroidRuntime(392):  at com.churnlabs.ffmpegsample.MainActivity.<clinit>(MainActivity.java:36)
  
  </clinit>

  Please help me.Thanks in advance.