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• FFMPEG Concat byte pictures into stream

  29 septembre 2017, par user3187926

  I am writing an interface layer between Milestone VMS and web page. Basically what I need to do is to stream video from Milestone server to a webpage. Right now I am successfully pulling video from the server but the catch is that the server ONLY sends pictures(in JFIF(jpeg-ish)) in byte data. I am able to capture and save them localy but I cant figure out how to ACTUALLY concat them into a stable stream.

  I am working in java and have my images as a bytes would it be possible to use FFMPEG to create an HTML5 stream-able video ? If so how ?

• avcodec/vc1dec : Print warning for frame pictures with direct mode MBs, followed by...

  1er février 2014, par Michael Niedermayer

  avcodec/vc1dec : Print warning for frame pictures with direct mode MBs, followed by field pictures
  This case is not implemented
  
  No non fuzzed samples are known to use this
  Signed-off-by : Michael Niedermayer <michaelni@gmx.at>
  

  • [DH] libavcodec/vc1dec.c

• 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);