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• ffmpeg - prop flicker removal works but ffmpeg insists on changing framerate [closed]

  28 avril 2023, par Mutley Eugenius

  I have been researching how to use FFmpeg to do some fantastic wizardry on my cockpit videos to remove the dramatically distracting propeller, but after many hours now I cannot seem to find a way to get the program to stop stripping more than half the frames. The source video file is 1920 x 1080 @ 60fps and I believe I have my offset right (1/60= 0.0166) but the output video is always coming out at 25 fps. Can't see what element in the code is telling it to do that, or how to change it.

  


  Here's my file :

  


  https://drive.google.com/file/d/1VPttH4PHgUr0uzmsbl4Bcyg5_gAixblA/view?usp=sharing

  


  Here's my code :

  


  ffmpeg -i G:\PropFlicker.mp4 -itsoffset 0.01666 -i G:\PropFlicker.mp4 -filter_complex color=0x202020:s=1920x1080:d=24[mask];[mask][0][1]maskedmax=[out] -map [out] -crf 10 G:\PropNoFlicker.mp4


  


  I have tried adding -r 60 which gives me a 60 fps output file, but the video is still being processed at 25 and it just adds in duplicated frames after processing to pad it out to 60. The rendering shows more dropped frames than rendered frames by about a 3 to 2 ratio which matches frame drops from 60 to 25. I lose my shot fluidity and I get flickery artifacts

  


  What am I missing to get the flicker removal processing done at 60 fps and the output file rendered at 60 fps with the original smoothness ?

  


  I'm also not sure what the :d=24 is doing. I tried d=60, but it made no difference.

  


  I copied original code that I found in this link :

  


  text

  


• Is this generated in Adobe Premier or After Effects ? [closed]

  13 avril 2021, par Ryan

  Can someone please tell me if this JSON file is or can be exported using after effects or premier pro ? I really cant figure this out. This is a JSON file which becomes a part of a template file which is used to render a .mp4 using FFMPEG Lib in an android app.

  


  JSON CODE

  


• How to use FFmpeg in python for desktop streaming without buffering or saving to file

  6 mai 2021, par guidingfox

  I am trying to use FFmpeg in python as a subprocess for capturing screen and converting to numpy array using pipe. This for a desktop sharing software.
I have two codes I've written :

  


  1st case : It doesn't work at all except for the FFmpeg cmd.

  


  Code :

  


      cmd = "ffmpeg -f gdigrab -framerate 30 -i desktop -f h264 pipe:1"

pipe = subprocess.run(cmd,
                       stdout=subprocess.PIPE,
                       stderr=subprocess.PIPE,
                       bufsize=2)

print(pipe.stdout, pipe.stderr)


  


  2nd case : It works but I get a numpy array every 3 - 4 seconds only.

  


  Code :

  


  cmd = 'ffmpeg -f gdigrab -framerate 30 -i desktop -f h264 pipe:1'

size = 480 * 240 * 3
proc = sp.Popen(cmd, stdout=sp.PIPE)

while True:
    try:
        tic = time.perf_counter()
        frame = proc.stdout.read(size)
        #print(frame)
        if frame is None:
            print('no input')
            break
        image = np.frombuffer(frame, dtype='uint8').reshape(240, 480, 3)
        toc = time.perf_counter()
        print(f"performed calc in {(toc - tic) * 1000:0.4f} miliseconds")
        cv2.imshow('received', image)
    except Exception as e:
        print(e)

cv2.destroyAllWindows()
proc.stdin.close()
proc.wait()
 


  


  I think it is buffering the frames during that 3 seconds, but that would be terrible for a desktop sharing setup.
I am trying to get as low latency between capturing and streaming as possible.

  


  Any help would be greatly appreciated !