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• Convert multible files with threading ffmpeg in Python

  21 mars 2020, par Florian

  I’m trying to convert mp3 files to m4a. The files are in different folders like MainFolder(folder1, folder2,...)

  It works already but is very slow because it is converting file by file.

  import os
  
  import sys
  
  
  
  path = "/Users/flo/Desktop/test"
  
  
  
  for root, dir, files in os.walk(path):
  
      dir.sort()
  
      files.sort()
  
  
  
      for file in files:
  
          if file.find('.mp3') != -1:
  
              os.system('ffmpeg -i ' +'"' +root +'/' +file +'" ' +'-c:v copy -c:a libfdk_aac -b:a 300k '  +'"' +root +'/' +file[:-4] +'.m4b' +'"')

  Now I would like to implement multitasking.

  import os
  
  import sys
  
  import threading
  
  import queue
  
  
  
  path = "/Users/flo/Desktop/test"
  
  def convert(file):
  
      if file.find('.mp3') != -1:
  
          os.system('ffmpeg -i ' +'"' +root +'/' +file +'" ' +'-c:v copy -c:a libfdk_aac -b:a 300k '  +'"' +root +'/' +file[:-4] +'.m4b' +'"')
  
  
  
  for root, dir, files in os.walk(path):
  
      dir.sort()
  
      files.sort()
  
  
  
      q = queue.Queue
  
      threads = [threading.Thread(target=convert(file)) for file in files]
  
      for t in threads:
  
          t.start()
  
  
  
      for file in files:
  
          q.put(file)
  
  
  
      for file in files:
  
          q.put('stop')
  
  
  
      q.join()
  
  
  
      for t in threads:
  
          t.join()

  But I got the error message :

  File "/var/folders/r6/z5f_jcf139b8fh2n8m4lznlm0000gn/T/atom_script_tempfiles/30127c90-6b13-11ea-af8a-432a34b059ac", line 31
  
      threads = [threading.Thread(target=convert(file)) for file in files]
  
      ^
  
  IndentationError: unexpected indent
  
  [Finished in 0.028s]

• ffmpeg jpg batch script with timestamp

  3 juillet 2021, par Chris

  I currently have this batch script using ffmpeg to scale images and place in a new location with the same folder structure. How do i include the timestamp from the original jpg file in the filename of the new scaled jpg file ?

  


  This gives files named m-H-S_IMG_0305

  


  @echo off &setlocal
set /a nfile=0
echo Copying directory structure from %1 to %2 ...
xcopy /T "%~1" "%~2"
REM walk directory structure and convert each file in quiet mode
set "sourcefolder=%~1"
set "targetfolder=%~2"
for /R "%sourcefolder%" %%a in (*.JPG) do (
    echo converting "%%~nxa" ...
    set "sourcefile=%%~fa"
    set "sourcepath=%%~dpa"
    set "targetfile=%%~na.JPG"
    setlocal enabledelayedexpansion
    set "targetfolder=%targetfolder%!sourcepath:%sourcefolder%=!"
    ffmpeg -v quiet -i "!sourcefile!" -vf scale=256x256 -q:v 1 -strftime 1 "!targetfolder!%Y-%m-%d_%H-%M-%S_!targetfile!"
    endlocal
    set /A nfile+=1
)
echo Done! Converted %nfile% file(s)


  


  Working version for file modify date :

  


  @echo off &setlocal
set /a nfile=0
echo Copying directory structure from %1 to %2 ...
xcopy /T "%~1" "%~2"
REM walk directory structure and convert each file in quiet mode
set "sourcefolder=%~1"
set "targetfolder=%~2"
for /R "%sourcefolder%" %%a in (*.JPG) do (
    echo converting "%%~nxa" ...
    echo which has a timestamp of "%%~ta" ...
    set "sourcefile=%%~fa"
    set "sourcepath=%%~dpa"
    set "targetfile=%%~na.JPG"
    set "timestamp=%%~ta"
    setlocal enabledelayedexpansion
    set "timestamp=!timestamp: =_!"
    set "timestamp=!timestamp::=-!"
    set "timestamp=!timestamp:/=-!"
    set "targetfolder=%targetfolder%!sourcepath:%sourcefolder%=!"
    ffmpeg -v quiet -i "!sourcefile!" -vf scale=256x256 -q:v 1 "!targetfolder!!timestamp!_!targetfile!"
    endlocal
    set /A nfile+=1
)
echo Done! Converted %nfile% file(s)


  


  File Creation date option attempt using exiftool (This works but it stops frequently so there is an error somewhere) :

  


  @echo off &setlocal
set /a nfile=0
echo Copying directory structure from %1 to %2 ...
xcopy /T "%~1" "%~2"
REM walk directory structure and convert each file in quiet mode
set "sourcefolder=%~1"
set "targetfolder=%~2"
for /R "%sourcefolder%" %%a in (*.JPG) do (
    echo converting "%%~nxa" ...
    echo which has a timestamp of "%%~ta" ...
    set "sourcefile=%%~fa"
    set "sourcepath=%%~dpa"
    set "targetfile=%%~na.JPG"
    set "timestamp=('exiftool -d %%Y%%m%%d_%%H%%M%%S -CreateDate %%~a')"
    for /f "tokens=1,2 delims=x" %%a in ('exiftool -T -d %%Y%%m%%d_%%H%%M%%S -CreateDate "%%a"') do (
        set "timestamp=%%a"
    )
    setlocal enabledelayedexpansion
    set "targetfolder=%targetfolder%!sourcepath:%sourcefolder%=!"
    ffmpeg -v quiet -i "!sourcefile!" -vf scale=256x256 -q:v 1 "!targetfolder!!timestamp!_!targetfile!"
    endlocal
    set /A nfile+=1
)
echo Done! Converted %nfile% file(s)


  


• Video stream analysis on the fly - advise ?

  8 avril 2016, par jakkolwiek

  I’m planning to develop a simple solution that would able me to perform a very basic video stream analysis on the fly. I’ve never done anything like that before, hence the very general and open question. The main focus is on checking if the stream is going without problems like - freeze frames, black screens and if the audio is there. Sync is out of scope. I read about open libraries like OpenCV and Xuggler, but they seem more complex than for my needs. FFmpeg is able to detect black screens, but not on the fly.

  Is there any other open lib I could look into ? Could you advise me anything ? I’m thinking about using Java or Python. Or maybe both. Efficiency of the solution is out of scope, I’m focusing now only on freeze frames and black screens detection.

  Any advise is welcome !

  Best regards,
  Peter