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• Running PowerShell command in Universal Windows Platform C#

  6 juin 2017, par stephen

  So I am trying to write a basic application to cut and export a subsection of a video. I have come across (and decided to use) the FFMPEG command line tools to do the cropping. This seemed straight forward (https://stackoverflow.com/a/5047426/6728859), but Universal Windows apps do not support System.Diagnostics.Process. Instead, it was suggested that they do support Powershell, which means I could do it by following (https://blogs.msdn.microsoft.com/kebab/2014/04/28/executing-powershell-scripts-from-c/). However, I get the following errors

  Cannot find type System.SystemException in module CommonLanguageRuntimeLibrary

  Cannot resolve Assembly or Windows Metadata file 'System.Configuration.Install.dll'

  From my limited understanding System.SystemException was removed in UWP, and I’m not sure where to find System.Configuration.Install.dll.

  Now to get PowerShell I had to include System.Management.Automation which I got from C:\Program Files (x86)\Reference Assemblies\Microsoft\WindowsPowerShell\3.0 which doesn’t seem correct to me, but I could be wrong.

  Is it possible to run commands in a UWP, or does anyone have any suggestions ?

• FFmpeg Easing function doesn't behave as expected [closed]

  11 juin 2024, par Alejandro Sanchez

  What is the simplest way to add an easing function to an animation ? I'm currently trying to animate a zoom value, but for some reason, it goes completely over the final zoom value i constrained it to (my easing function should output values between 0 and 1) : This is the part of a bigger expression which i just cannot understand :

  


  if(gt(in_time\,3.7999999046325685)\,3 - ((0.3) * (((exp((5*(it-3.80)) - 1))/(exp(5*0.80)-1))))\,3)

  


  Note : (exp((5*(it-3.80)) - 1))/(exp(50.80)-1))) are values between 0 and 1 for the animation duration of 0.8 seconds, however the resulting zoom goes way beyond 3-0.31 = 2.7, it just goes crazy in the end.

  


  I tried all kinds of easing functions, all of them behave similarly

  


• FFmpeg — calculate zoompan filter duration

  1er août 2017, par artuska

  I want to make 30 seconds video with smooth small zooming effect of an image. What i do :

  ffmpeg -y -loop 1 -i 1.png -vf "zoompan=z='min(max(zoom,pzoom)+0.0015,1.1)':d=1:x='iw/2-(iw/zoom/2)':y='ih/2-(ih/zoom/2)':s='1000x1000'" -c:v libx264 -t 30 1.mp4

  How to modify my ffmpeg zoompan params for zoom effect during 30 seconds (all video time) ? Now it produce 3 seconds effect at all. Docs says :

  d — Set the duration expression in number of frames. This sets for how many number of frames effect will last for single input image.

  But my experiments with d falied. Thanks !