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• how do I echo only white space and no newline

  3 décembre 2016, par Dan Sherman

  I’m working on a simple batch script that loops over files in a directory and process them with ffmpeg. for readability purposes, I want to indent the ffmpeg output 4 spaces, but I cannot come up with a way that works.

  @echo off
  
  
  
  for %%a in (%~dp0rawVideo\*.MP4) do (
  
  
  
      if exist %~dp0rawAudio\%%~na.wav (
  
          echo Already Processed :
  
          echo     %%a
  
      ) else (
  
          echo Processing :
  
          echo     %%a
  
          echo|set /p leadingSpace="#   "   
  
          ffmpeg -c:v h264 -threads 24 -i %%a -map_channel 0.1.0 -map_channel -1 -y -v quiet -stats %~dp0rawAudio\%%~na.wav
  
      )
  
  
  
      echo(
  
  )
  
  pause

  If I just do this i get nothing, because I’ve read windows strips leading white spaces.

  echo|set /p leadingSpace="    " 

  I tried what I think is the backspace trick as well, but it didn’t work. Is there no way of doing this ?

• SDL/ffmpeg on iOS showing only blank or white screen

  3 avril 2018, par Law Gimenez

  I am following this ffmpeg/SDL tutorial using Swift and using the URL path as let urlPath = "rtsp://184.72.239.149/vod/mp4:BigBuckBunny_175k.mov" but it is only showing white or blank and it does not show anything. I want to show a window as what other tutorials say.

  I logged all the flow and there is no error. I have very little experience on SDL, let me know if some part of the code is not working.

• How to apply complex filters more than once with different parameters while avoiding "too many inputs" errors in ffmpeg ?

  15 mai 2019, par Hugh Walxet

  I’m trying to apply the displace complex filter more than once in a video, at specific intervals with no proportional relationship. In each instance, I want to apply the displace filter with slightly different parameters. If I list it twice in the commands for the complex_filter, I get an error saying I have too many inputs.

  I might as well ask, separately, how I could apply the same filter with the same parameters more than once in a video, without re-iterating the same filter more than once in the command line. Put differently, how do I run a filter as specific times without writing the command several times sequentially, each with a different trigger time ?

  C :\Users\Me>ffmpeg -i c :\users\Me\desktop\house2.mp4 -i c :\users\Me\desktop\house3.mp4 -i c:users\Me\desktop\house4.mp4 -filter_complex "shuffleframes=enable=’between(t,21,27)’:mapping=0 9 2 1 10 5 8 6 7 4 3, shuffleframes=enable=’between(t,3,7)’:mapping=0 4 9 1 10 5 8 6 2 7 4 3, shuffleframes=enable=’between(t,15,19)’:mapping=0 6 2 1 10 5 8 3 7 4 9, [0][1][2] displace=enable=’between(t,9,10)’:edge=wrap, [0][1][2] displace=enable=’between(t,20,21)’:edge=smear" c :\users\Me\desktop\houseglitch.mp4