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• Revision f5209d7e01 : Remove rate component adjustment for AQ1 In AQ1 a rate adjustment was applied f

  21 novembre 2014, par Paul Wilkins

  Changed Paths :
   Modify /vp9/encoder/vp9_encodeframe.c

  
  
  Remove rate component adjustment for AQ1

  In AQ1 a rate adjustment was applied for blocks coded with a
  deltaq. This tends to skew the partition selection and cause
  rate overshoot.

  For example, consider a 64x64 super block where some but not all
  sub blocks are in a low q segment and some are in a high q segment.
  The choice of Q when considering large partition and transform sizes
  is defined by the lowest sub block segment id (currently this implies the
  lowest Q). If some parts of the larger partition are very hard this will
  cause a high rate component.

  The correct behavior here is for the rd code to discard the large partition
  choice and break down to sub blocks where some have low and some
  have high Q. However the rate correction factor above mask the high
  cost of coding at a larger partition size.

  Change-Id : Ie077edd0b1b43c094898f481df772ea280b35960

• Ndk : Button event error Fatal 11 SIGSEGV when video streaming

  24 avril 2015, par user3773632

  I’m using ffmpeg in ndk, make video streaming service.

  my problem is that Video streaming when the button is pressed, an fatal 11 SIGSEGV error occurs.

  this my source

  protected void onCreate(Bundle savedInstanceState) {
  
      super.onCreate(savedInstanceState);
  
      setContentView(R.layout.fragment_main);
  
  
  
      Log.v("LOG", "CREATE");
  
  
  
      mUHSurfaceView = (UHSurfaceView) findViewById(R.id.uhsurfaceview); 
  
      bCamera = (Button)findViewById(R.id.camera);
  
  
  
      bCamera.setOnClickListener(new OnClickListener() {
  
          @Override
  
          public void onClick(View v) {
  
              // TODO Auto-generated method stub
  
              Log.v("CameraButton", "CameraButton");
  
          }
  
      });

  In ndk using ffmpeg h264 decoding and rgb24 through opengl(GLSurfaceView) screen output.
  I don’t know why occur this error i can’t solve error
  please help me !

  my device : Samsung galaxy s4 mini
  android : 4.2.2

  Thanks.

• avutil/libm : correct isnan, isinf compat hacks

  15 novembre 2015, par Ganesh Ajjanagadde

  avutil/libm : correct isnan, isinf compat hacks
  isnan and isinf are actually macros as per the standard. In particular,
  
  the existing implementation has incorrect signature. Furthermore, this
  
  results in undefined behavior for e.g double values outside float range
  
  as per the standard.
  This patch corrects the undefined behavior for all usage within FFmpeg.
  Note that long double is not handled as it is not used in FFmpeg.
  
  Furthermore, even if at some point long double gets used, it is likely
  
  not needed to modify the macro in practice for usage in FFmpeg. See
  
  below for analysis.
  Getting long double to work strictly per the spec is significantly harder
  
  since a long double may be an IEEE 128 bit quad (very rare), 80 bit
  
  extended precision value (on GCC/Clang), or simply double (on recent Microsoft).
  
  On the other hand, any potential future usage of long double is likely
  
  for precision (when a platform offers extra precision) and not for range, since
  
  the range anyway varies and is not as portable as IEEE 754 single/double
  
  precision. In such cases, the implicit cast to a double is well defined
  
  and isinf and isnan should work as intended.
  Reviewed-by : Michael Niedermayer <michael@niedermayer.cc>
  
  Signed-off-by : Ganesh Ajjanagadde <gajjanagadde@gmail.com>
  

  • [DH] libavutil/libm.h