Recherche avancée

Sur d’autres sites (6311)

• Using GDIgrab in FFmpeg with dshow Audio produces black screen

  16 mars 2016, par Spreadys

  here is my command :

  ffmpeg -f gdigrab -framerate 25 -offset_x 10 -offset_y 10 -show_region 1 -draw_mouse 1 -video_size 1280x720 -i desktop -f dshow -i audio="Microphone (2- ATR USB microphone)" -r 25 -threads 4 -c:v libx264 -pix_fmt yuv422p -preset superfast -tune fastdecode -x264opts keyint=25:min-keyint=1 -crf 4 -c:a aac -profile:a aac_low -async 25 "C:\Users\david\Desktop\%output%.mp4"

  The gdigrab video works great when it is on its own (no audio). The audio works fine when it is on its own (no video). When I join the two commands to capture both together, as soon as I move a window within my capture area, the area goes black.

  In Windows 7, I used to get around this by stopping the desktop composition service prior to capture, (SC stop uxsms), but this is now not possible in Win10.

  I thought it may be something graphics card related.
  My main monitor is on an Nvidia card, with my second running from the onboard Intel. This is setup for Quicksync H264 playback and encoding with my NLE.

  I know that I could use a dshow screen capture driver such as UScreen but am trying to avoid that as I need the capture area to be specified each time from a simple batch.

  Any help appreciated to solve this black area problem- its driving me crazy !
  David

• 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);

• Can't Titan Black use NVENC ?

  13 mars 2016, par SPWW

  I compiled FFMPEG with —enable-nvenc and want to encode with NVENC encoder, but I got this error message when running ffmpeg.

  [nvenc_h264 @ 0x8ed020] 4 CUDA capable devices found
  
  [nvenc_h264 @ 0x8ed020] [ GPU #0 - < GeForce GTX TITAN Black > has Compute SM 3.5, NVENC Not Available ]
  
  [nvenc_h264 @ 0x8ed020] [ GPU #1 - < GeForce GTX TITAN Black > has Compute SM 3.5, NVENC Not Available ]
  
  [nvenc_h264 @ 0x8ed020] [ GPU #2 - < GeForce GTX TITAN Black > has Compute SM 3.5, NVENC Not Available ]
  
  [nvenc_h264 @ 0x8ed020] [ GPU #3 - < GeForce GTX TITAN Black > has Compute SM 3.5, NVENC Not Available ]
  
  [nvenc_h264 @ 0x8ed020] No NVENC capable devices found

  I have titan black gpu and as the official document said it should be supported.

  my nvenc-sdk version is 5.0

  and the nvidia-smi info is listed below.

  ~> nvidia-smi
  
  Wed Jan  6 16:36:55 2016
  
  +------------------------------------------------------+
  
  | NVIDIA-SMI 352.39     Driver Version: 352.39         |
  
  |-------------------------------+----------------------+----------------------+
  
  | GPU  Name        Persistence-M| Bus-Id        Disp.A | Volatile Uncorr. ECC |
  
  | Fan  Temp  Perf  Pwr:Usage/Cap|         Memory-Usage | GPU-Util  Compute M. |
  
  |===============================+======================+======================|
  
  |   0  GeForce GTX TIT...  Off  | 0000:02:00.0     Off |                  N/A |
  
  | 54%   82C    P2   215W / 250W |   4422MiB /  6143MiB |     77%      Default |
  
  +-------------------------------+----------------------+----------------------+
  
  |   1  GeForce GTX TIT...  Off  | 0000:04:00.0     Off |                  N/A |
  
  | 55%   82C    P2   160W / 250W |   5926MiB /  6143MiB |     84%      Default |
  
  +-------------------------------+----------------------+----------------------+
  
  |   2  GeForce GTX TIT...  Off  | 0000:83:00.0     Off |                  N/A |
  
  | 58%   83C    P2   147W / 250W |   5926MiB /  6143MiB |     68%      Default |
  
  +-------------------------------+----------------------+----------------------+
  
  |   3  GeForce GTX TIT...  Off  | 0000:84:00.0     Off |                  N/A |
  
  | 53%   83C    P2   191W / 250W |   3155MiB /  6143MiB |     85%      Default |
  
  +-------------------------------+----------------------+----------------------+