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• Remove Static Pixels from a Video to Mimic a Green Screen Effect [closed]

  2 août 2021, par nKrkan

  I have a video that's 50 seconds in length, resolution of 480x480 and 16 frames per second.

  


  There is a person talking in it, with the background being static I thought if there's a way
  
to remove those static pixels (background) and just extract the moving pixels (foreground)
  
and possibly mimic a green screen effect ?

  


  I was thinking on writing a picture-by-picture comparison tool to do such thing but I don't
  
believe I'm up to the task, or maybe It's laziness.

  


  And now I know, some of you will point out that the video has compression artifacts and that
  
might cause some problems but It doesn't have to be Studio quality stuff.

  


  I tried the ffmpeg command from this question : Remove random background from video using ffmpeg or Python
  
And it does mask the person, but... I couldn't quite get it to work, apparently putting the
  
reference image in the input makes that image burned into the video, thus having no way to
  
remove it, but it did mask the background as black and the person as greenish, so still not a
  
viable way to do it.

  


  Have also tried some Python projects I've found on the GitHub but none of them worked as
  
I expected.

  


  So, what I thought to do is simply compare the first and the second frame of the video, check
  
all the pixels by comparing them with the two sources, and change those that stay within a
  
certain range of the initial pixel value.

  


  I should point out I'm not very knowledgeable with mathematics and the majority of the
  
methods used in these type of things, but perhaps someone could point me to an interesting
  
source to read and learn, or by providing an alternative to the methods aforementioned above.

  


• How can I upscale a stereo signal using PLII on a VM

  27 mars 2024, par andersmi

  I want to upscale a stereo signal with PLII from an input on a VM and sent it to an output after the upscale.

  


  I am thinking of installing Voicemeeter/Virtual Audio Cable or something like that to get an input on the VM.
I will then be able to use Dante Via on the VM host to sent the audio to the VM input and receive it again from the VM output on Dante Via then send it to my amplifier.
The solution needs to be able to initialize itself after reboot.

  


  I have looked into different solutions the most promissing seems to be FFDShow and FFMpeg, but there is not much information about how to do this. I don't care what is used just as long as it support PLII.

  


  I am looking for information on how to use FFDShow/FFMpeg with an application I develop or any other way to solve this.

  


  Thanks

  


• iOS - Convert Audio Format (opus to mp3)

  30 mai 2017, par Android0077

  Recently I started to develop application that work with .opus file (Audio Format).

  I am working with external SDK that can processor a mp3/wav file, unfortunately my local file is a .opus file and I need to convert it to mp3/wav format in order to process the file.

  I read and research a lot around the network to find a solution,
  I found the FFmpegWrapper library that can convert two type of Audio Format but when I try to convert .opus to .mp3/ , I get this error : opus codec not supported in WAVE format
  I do not know what can be done, I’ll be happy to help.

  Any information about how to convert .Opus format to any other format will be appreciated.

  Thanks