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• Video modifications using ffmpeg and windows batch command

  1er mars 2019, par macenike

  I have a series of 8 videos which have different number of frames, some of them lose a couple of them at the beginning. I was trying to concatenate at the beginning of the videos with less frame a copy of their first frame. Unfortunately my code either crash while comparing the length of the videos or fail to accomplish the task required. Here I add the code that I’m using.

  @ECHO off
  
  SETLOCAL EnableDelayedExpansion
  
  MKDIR COMPRESSED\
  
  MKDIR RAW\
  
  SET  j=0
  
  SET  jj=1
  
  SET max=1
  
  FOR %%a IN (*.avi) DO (
  
      SET /A j=j+1
  
      FOR /F "delims=" %%V IN ('ffprobe.exe -v error -count_frames -select_streams v:0 -show_entries stream^=nb_read_frames -of       default^=noprint_wrappers^=1:nokey^=1 ".\%%~nxa" 2^>^&1') DO SET elem[!j!]=%%V
  
  SET elem[!j!]
  
  )
  
  
  
  FOR %%a IN (*.avi) DO (
  
      IF !elem[%jj%]! GTR !elem[%max%]!(
  
          SET max=!jj!
  
      )
  
  SET /A jj=jj+1  
  
  ) 
  
  SET max
  
  
  
  SET /A x=1
  
  FOR %%a IN (*.avi) DO ( 
  
  
  
      IF "!elem[!x!]!" LSS "!elem[!max!]!" (
  
              ffmpeg -i ".\%%~nxa" -vf "select=eq(n\,0)" -q:v 3 output_image.jpg
  
              ffmpeg -y -i ".\%%~nxa" -loop 1 -i output_image.jpg -t 0.01 -s 1936x1216 ".\%%~nxa"
  
              SET elem[!x!]=elem[!x!]+1
  
              SET elem[!x!]                   
  
      )
  
  SET /A x=x+1    
  
  ) 
  
  
  
  
  
  FOR %%a IN (*.avi) DO (
  
      ffprobe -v error -count_frames -select_streams v:0 -show_entries stream=nb_read_frames ".\%%~nxa"
  
      ffmpeg -i ".\%%~nxa" -c:v libxvid -vtag xvid -qscale:v 2 -force_key_frames 1 -s 968x400 -r 100 ".\COMPRESSED\%%a"
  
      SET mystr=%%~na
  
      SET mystr=!mystr:~-1!
  
      IF !mystr! == 3 (
  
          ffmpeg -i ".\%%~nxa" -c:v mpeg4 -b:v 4M -c:a libfdk_aac -b:a 192k ".\COMPRESSED\%%~na.mp4"
  
      )
  
      IF !mystr! == 5 (
  
          ffmpeg -i ".\%%~nxa" -c:v mpeg4 -b:v 4M -c:a libfdk_aac -b:a 192k ".\COMPRESSED\%%~na.mp4"
  
      )
  
  )

• Problem with ffmpeg syntax in a for loop in batch file [duplicate]

  24 février 2019, par user1738673

  This question already has an answer here :

  • Batch character escaping
    
    4 answers
    

  My goal is to loop through my music folders, read the bitrate of each file, and if greater than 192k, convert it to 192k, then delete the original. I have working batch files that will do each task. The problem comes when I try to combine the lines from the working code. Depending on where I put the quotation marks, I get varying errors about filenames. So, I need someone who really knows how to read this code to solve the issue.

  Here are each of the working batch files. They do everything exactly as they should.

  First : Loop through files and get the bitrate

  @echo off & setlocal
  
  FOR /r %%i in (*.mp3) DO (
  
              ffprobe -v error -show_entries stream=bit_rate -of default=noprint_wrappers=1:nokey=1 "%%~fi"
  
              )
  
  ECHO Completed %~n0
  
  PAUSE

  Here is the output :

  320000
  
  320000
  
  192000
  
  320000
  
  320000
  
  320000
  
  320000
  
  320000
  
  320000
  
  320000
  
  320000
  
  320000
  
  Completed BrTestLoop6
  
  Press any key to continue . . .

  Next, the batch file for converting all MP3 files to 192k, then deleting the orginal :

  @echo off & setlocal
  
  FOR /r %%i in (*.mp3) DO (
  
                ffmpeg -i "%%~fi" -ab 192k -map_metadata 0 -id3v2_version 3 "%%~dpni_192.mp3"
  
                if not errorlevel 1 if exist "%%~fi" del /q "%%~fi"
  
              )
  
  ECHO Completed %~n0
  
  PAUSE

  I get perfect conversions at 192k and all of the originals are deleted.

  Now, the combined version :

  @echo off & setlocal
  
  
  
  FOR /R %%i in (*.mp3) DO (
  
      FOR /F "TOKENS=1 DELIMS==" %%H IN ('ffprobe -v error -show_entries stream=bit_rate -of default=noprint_wrappers=1:nokey=1 "%%i"') DO (
  
          IF %%H GTR 192000 ffmpeg -i "%%i" -ab 192k -map_metadata 0 -id3v2_version 3 "%%~dpni_192.mp3"
  
      )
  
  )
  
  
  
  PAUSE

  I get the following output :

  Argument 'noprint_wrappers' provided as input filename, but 'bit_rate' was already specified.
  
  Argument 'noprint_wrappers' provided as input filename, but 'bit_rate' was already specified.
  
  Argument 'noprint_wrappers' provided as input filename, but 'bit_rate' was already specified.
  
  Argument 'noprint_wrappers' provided as input filename, but 'bit_rate' was already specified.
  
  Argument 'noprint_wrappers' provided as input filename, but 'bit_rate' was already specified.
  
  Argument 'noprint_wrappers' provided as input filename, but 'bit_rate' was already specified.
  
  Argument 'noprint_wrappers' provided as input filename, but 'bit_rate' was already specified.
  
  Argument 'noprint_wrappers' provided as input filename, but 'bit_rate' was already specified.
  
  Argument 'noprint_wrappers' provided as input filename, but 'bit_rate' was already specified.
  
  Argument 'noprint_wrappers' provided as input filename, but 'bit_rate' was already specified.
  
  Argument 'noprint_wrappers' provided as input filename, but 'bit_rate' was already specified.
  
  Argument 'noprint_wrappers' provided as input filename, but 'bit_rate' was already specified.
  
  Press any key to continue . . .

• Video modifications using ffmpeg and bash command

  26 février 2019, par macenike

  I have a series of 8 videos which have different number of frames, some of them lose a couple of them at the beginning. I was trying to concatenate at the beginning of the videos with less frame a copy of their first frame. Unfortunately my code either crash while comparing the length of the videos or fail to accomplish the task required. Here I add the code that I’m using.

  @ECHO off
  
  SETLOCAL EnableDelayedExpansion
  
  MKDIR COMPRESSED\
  
  MKDIR RAW\
  
  SET  j=0
  
  SET  jj=1
  
  SET max=1
  
  FOR %%a IN (*.avi) DO (
  
      SET /A j=j+1
  
      FOR /F "delims=" %%V IN ('ffprobe.exe -v error -count_frames -select_streams v:0 -show_entries stream^=nb_read_frames -of       default^=noprint_wrappers^=1:nokey^=1 ".\%%~nxa" 2^>^&1') DO SET elem[!j!]=%%V
  
  SET elem[!j!]
  
  )
  
  
  
  FOR %%a IN (*.avi) DO (
  
      IF !elem[%jj%]! GTR !elem[%max%]!(
  
          SET max=!jj!
  
      )
  
  SET /A jj=jj+1  
  
  ) 
  
  SET max
  
  
  
  SET /A x=1
  
  FOR %%a IN (*.avi) DO ( 
  
  
  
      IF "!elem[!x!]!" LSS "!elem[!max!]!" (
  
              ffmpeg -i ".\%%~nxa" -vf "select=eq(n\,0)" -q:v 3 output_image.jpg
  
              ffmpeg -y -i ".\%%~nxa" -loop 1 -i output_image.jpg -t 0.01 -s 1936x1216 ".\%%~nxa"
  
              SET elem[!x!]=elem[!x!]+1
  
              SET elem[!x!]                   
  
      )
  
  SET /A x=x+1    
  
  ) 
  
  
  
  
  
  FOR %%a IN (*.avi) DO (
  
      ffprobe -v error -count_frames -select_streams v:0 -show_entries stream=nb_read_frames ".\%%~nxa"
  
      ffmpeg -i ".\%%~nxa" -c:v libxvid -vtag xvid -qscale:v 2 -force_key_frames 1 -s 968x400 -r 100 ".\COMPRESSED\%%a"
  
      SET mystr=%%~na
  
      SET mystr=!mystr:~-1!
  
      IF !mystr! == 3 (
  
          ffmpeg -i ".\%%~nxa" -c:v mpeg4 -b:v 4M -c:a libfdk_aac -b:a 192k ".\COMPRESSED\%%~na.mp4"
  
      )
  
      IF !mystr! == 5 (
  
          ffmpeg -i ".\%%~nxa" -c:v mpeg4 -b:v 4M -c:a libfdk_aac -b:a 192k ".\COMPRESSED\%%~na.mp4"
  
      )
  
  )