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• v210 : Add avx2 version of the 8-bit line encoder

  15 janvier 2016, par James Darnley

  v210 : Add avx2 version of the 8-bit line encoder
  Around 35% faster than the avx version.
  Signed-off-by : Henrik Gramner <henrik@gramner.com>
  
  Signed-off-by : Luca Barbato <lu_zero@gentoo.org>
  

  • [DBH] libavcodec/v210enc.c
  • [DBH] libavcodec/v210enc.h
  • [DBH] libavcodec/x86/v210enc.asm
  • [DBH] libavcodec/x86/v210enc_init.c

• Definitive join MP3's in ffmpeg or avconv - whats the magic line of code ?

  10 février 2016, par pperrin

  I have some MP3’s they need to be concatenated in to a single MP3.

  What is the command line I need for FFMPEG or AVCONV to do this ?

  I don’t know or care about the quality/bit-rate etc of the inputs, I have what I have and they are random.

  I have hunted far and wide and found loads of people who like to talk about pages of useless detail that makes absolutely no difference to me...

  So...

  I have been using :

  ffmpeg -i "concat:file1.mp3|file2.mp3" -b:a:320000 -acodec file3.mp3

  The output sounds fine, but the output file often shows the duration and bitrate wrong on the output... what is the magic line of code I seek ?

  I am in no hurry - and can run the files through a dozen other processes if needed, and if quality goes down I really really don’t care - I just want a fully functional MP3 at the end of it.

• The transparent pixels in my Bitmap shown as white

  7 mai 2016, par Hassan Ibrahem

  I’m using c code to get frame from a gif file and it’s working fine using ffmpeg library av_read_frame, then I convert the returned image from this format BGRA to ARGB format using this method libyuv::ABGRToARGB.

  In the java part I receive the bitmap and when I put it in the ImageView the transparent pixels drawn white.

   Bitmap bitmap= Bitmap.createBitmap(150, 150, Bitmap.Config.ARGB_8888);
  
   getGifFrame(gifFile,bitmap); //native method which get image frame from gif file.
  
   imageTest.setImageBitmap(backgroundBitmap);//this bitmap in debug mode I can see that it has transparent pixels, but in drawn it appears white!

  even when I loop on the returned bitmap pixels and check for each pixel I find them transparent !

            for (int x = 0; x < b.getWidth(); x++)
  
              {
  
                  for (int y = 0; y < b.getHeight(); y++)
  
                  {
  
                      int color = b.getPixel(x, y);
  
                      if (color == Color.WHITE)//This condition never occurred 
  
                      {
  
                          b.setPixel(x, y, Color.TRANSPARENT);
  
                      }
  
                  }
  
              }

  Nothing happened and it’s still white. Then I did convert all transparent pixels to TRANSPARENT !! and guess what, It’s working !

  else if (color == Color.TRANSPARENT)
  
  {
  
    b.setPixel(x, y, Color.TRANSPARENT);
  
  }

  I don’t understand why that happen. Any help would be appreciated.

  EDIT 1 :
  I get all pixels from the bitmap and set them again without doing anything and it worked also !?

    bitmap.getPixels(pixels, 0, width, 0, 0, width, height);
  
    bitmap.setPixels(pixels, 0, width, 0, 0, width,height);