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• Iterate recursively in every subfolder and run a batch file

  6 août 2018, par Gokul Nair

  Please look at the following scenario wherein a folder A has many subfolders with different names. These subfolders have n number of .jpg files, which I am trying to scale and crop.

  Folder A\
  
    SubFolder 01\*.jpg
  
    SubFolder 02\*.jpg
  
    .
  
    .
  
    .
  
    SubFolder xx\*.jpg

  These sub-folders are with different names and do not have a trend when it comes to its names.

  I have created a batch file which would scale and crop images. This is working perfectly. I need to run the following command (name of file : ScaleCrop.bat) in each SubFolder xx :

  for %%I in (.) do set CurrDirName=%%~nxI
  
  for %%a in ("*.JPG") do ffmpeg -i "%%a" -vf ^"scale=-1:260, crop=250:250^" "..\ScaledImages\%CurrDirName%\%%a.JPG"
  
  for %%a in ("*.JPG") do ffmpeg -i "%%a" -vf ^"scale=260:-1, crop=250:250^" "..\ScaledImages\%CurrDirName%\%%a.JPG"
  
  pause

  The command Scales and crops the image in the folder and saves these files in to a folder named SacledImages, which too has subfolders of the same name (SubFolder 01, SubFolder 02,…,SubFolderxx).

  I have created another .bat file which I used to copy ScaleCrop.bat to each subfolder.

  for /d %%a in ("C:\Users\Name\Desktop\Folder A\*") do copy " C:\Users\Name\Desktop\Folder A\ScaleCrop.bat" "%%a"

  How could I code a batch file run and execute ScaleCrop.bat from each of these subfolders ?

  I tried using the following code, but this just calls the .bat file inside each subfolder, however it is not executing :

  for /f %%f in ('dir /ad /b') do start %%f\ScaleCrop.bat

  I Tried the following as well, this does the trick, but all images are getting overwritten as the scaled-cropped images are saved on to /SacledImages Folder and not inside ScaledImages/SubFolderxx :

  for /r "C:\ Users\Name\Desktop\Folder A " %%a in (.) do (
  
    pushd %%a
  
  for %%I in (.) do set CurrDirName=%%~nxI
  
  for %%a in ("*.JPG") do ffmpeg -i "%%a" -vf ^"scale=-1:260, crop=250:250^" "..\ScaledImages\%CurrDirName%\%%a.JPG"
  
  for %%a in ("*.JPG") do ffmpeg -i "%%a" -vf ^"scale=260:-1, crop=250:250^" "..\ScaledImages\%CurrDirName%\%%a.JPG"
  
  pause
  
    popd 
  
    )

• ffmpeg append an audio file to another audio file at position of every 10 seconds

  28 décembre 2018, par manoj kumar

  I want to append an audio file into another audio file at position of every 10 seconds through FFMPEG.

  1. ads.mp3 length 2 seconds (advertisement audio file)
  2. original.mp3 length xxxx seconds
  3. so output file could be as following

  file appending terms

  original.mp3 after 10 seconds append ads.mp3 for 2 seconds then
  again original.mp3 for 10 seconds append ads.mp3 for 2 seconds then
  again original.mp3 for 10 seconds append ads.mp3 for 2 seconds then
  again original.mp3 for 10 seconds ...... so long till end of
  original.mp3 file.

  Thanks

• Converting Video file to Audio file with ffmpeg, but the resulting Audio is shorter

  4 septembre 2020, par Shaner

  I'm trying to convert from FLV video file to wav audio. However, after creating a wav file, I noticed it's shorter than the video. Halfway through the audio no longer matches up with videos audio (off by about 2 seconds).

  


  Thus, it seems midway through, there are 2 seconds of audio being lost.
How can I fix it so the audio is taken exactly the same as the video ?

  


  Basic code as below :

  


  ffmpeg -i movie.flv -vn audio.wav