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• What should I do if the video is broken on a black screen when encoding with FFmpeg(h264) ?

  19 novembre 2018, par wowi77

  The MOV is broken when H.264 is encoded as below image. Can I encode it without breaking ?

  Encoding options :

  ffmpeg -y -i "background.mp4" -s "160x64" -c:v libx264 -vprofile baseline -level 3 -q:v 0 -mbtree 1 -r 30 -pix_fmt yuv420p -an -t "0:00:15.000000" "sample.mp4"

  

• Replace transparent pixels (alpha) with black in ffmpeg ?

  14 octobre 2018, par Sibbs Gambling

  I have an image with alpha channel indicating what the background is.

  How do I de-alpha-y (remove the alpha channel) and make the background pure black with ffmpeg ?

• 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 |
  
  +-------------------------------+----------------------+----------------------+