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• Is there a way to detect black on FFMPEG video files

  22 novembre 2019, par A Person

  I am trying to run a QC check on my video files.

  I know that there is a way to detect black frame or audio loss in a video file. Can anyone help me with how the syntax is written ?

  I have tried doing the following but I am having issues as I do not know how to tell from the output.

  ffmpeg -i inputfile.mxf -vf blackdetect=d=0.1:pix_th=.1 -f rawvideo -y /dev/null

  Also is there ay ways to check if I have any packets that are in error by using ffprobe or ffmpeg

  I also do not understand waht this 0.1:pix_th=.1 is doing ?

  EDIT* :

  I have used this command now

  ffmpeg -i 01.mxf -vf blackdetect=d=0:pix_th=.01 -f rawvideo -y /NUL

  this gives me

  [blackdetect @ 000001a2ed843740] black_start:0.04 black_end:2

  black_duration:1.96

  [mpeg2video @ 000001a2ed86efc0] ac-tex damaged at 45 304.08

  bitrate=829328.3kbits/s dup=1 drop=0 speed= 5.6x

  However, the actual video has more than this for the black frame.

  is there a way to tell it to continue looking at the video and get all black frames, not just the first instance.

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

• Convert video to hequirect while setting the background black and blur the transitional area [closed]

  11 février 2024, par Zurechtweiser

  I am using

  


  ffmpeg -i input.mp4 -vf "v360=input=fisheye:ih_fov=122.6:iv_fov=94.4:output=hequirect:h_fov=180:v_fov=180:in_stereo=2d:out_stereo=sbs,format=yuv420p" -b:v 25M -maxrate 60M -bufsize 25M output.mp4


  


  Which works as advertised to convert a fisheye to hequirect except for two problems :

  


  


  1. The background is not black but seems to try and set it to the average color of the video. It should be black throughout.

     


  


  2. The corners are not blurred but should be, there should be a soft transition from the corner of the video into black.