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• A ffplay Error :"Failed to set value 'yuv420p' for option 'pix_fmt' : Option not found"

  3 novembre 2023, par DavisTao

  I was trying to play a video by ffplay. Here’s my command :

  


  ffplay -f rawvideo -pix_fmt yuv420p -video_size 640x360 Resources/video.h264

  


  but I got this error :
Failed to set value 'yuv420p’ for option 'pix_fmt: Option not found

  


  So l used another command to make the video playing correctly, and this is the command :

  


  ffplay -f rawvideo -video_size 640x360 Resources/video.h264

  


  I wonder why the first command reported the error, because I used ffplav -pix_fmts and found that yuv420p is supported.

  


  By the way the pixel format of the video file is yuv420p exactly.

  


• Ffmpeg gdigrab records black window when capturing graphics-intensive flight simulator

  23 mars 2021, par iter

  I am trying to capture video from XPlane, a popular flight simulator. I'm running on Windows.

  



  Normally, I can capture individual windows using gdigrab, but when I use it on an XPlane window like so...

  



  ffmpeg -f gdigrab -framerate 30 -i "X-System" -b:v 300K capture.mp4


  



  ...I get a video file that's the right dimensions but is all black. I imagine this may have something to do with how XPlane talks directly to the GPU. I should add that if I capture the entire desktop like so...

  



  ffmpeg -f gdigrab -framerate 30 -i desktop -b:v 300K capture.mp4


  



  ...I get everything including the simulator window, but naturally with unrelated windows in the capture, including windows sitting on top of the simulator window.

  



  Is there a way for gdigrab to capture video this GPU-intensive window alone ? Is there a different tool I can use ?

  


• Every 27 seconds immediately appear around 3 seconds black

  23 juin 2018, par Monso

  I want every 27 seconds. appears a black space of 3 seconds and it repeats to the end. Example 0:27 0:54 1:21 until the end of the video .... here are 2 code I used but the second code does not work. The 1st code it automatically blurs the population, I want it not to fade itself. that i want it immediately black
  .please help me finish it

   Code 1
  
         ffmpeg -i input.mp4 -loop 1 -i logo.png -filter_complex "[1]trim=0:24,fade=in:st=0:d=1:alpha=1,fade=out:st=4:d=1:alpha=1,loop=999:750:0,setpts=N/25/TB[w];[0][w]overlay=shortest=1" output.mp4
  
  
  
   Code 2
  
         ffmpeg -i input.mp4 -vf "select='lt(mod(t,30),27)',setpts=N/FRAME_RATE/TB" output.mp4