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• Concat mp4 videos and merge their audios to the final output

  24 août 2020, par Yevhenii Molodtsov

  I have several videos and photos and need to merge them with the cross-dissolve effect. The algorithm is next :

  


  

  1. Create videos from images and add silent audio to them (so they will also have a sound stream) :

  


  


  ffmpeg -y -f lavfi -i anullsrc -loop 1 -i /tmp/media/import-2020-Aug-19-Wednesday-05-40-34/ea5c93fd-d946-4742-b8f7-ea9ae4d43441.jpg -c:v libx264 -t 10 -pix_fmt yuv420p -vf scale=750:1280  /tmp/media/import-2020-Aug-19-Wednesday-05-40-34/ea5c93fd-d946-4742-b8f7-ea9ae4d43441.mp4


  


  

  2. Combine all the videos and audios into one using this command :

  


  


  ffmpeg 
-i /tmp/media/import-2020-Aug-19-Wednesday-05-40-34/temp_68d437c0-f5e2-4651-b07e-91533480b6ef.mp4 
-i /tmp/media/import-2020-Aug-19-Wednesday-05-40-34/temp_48f3c111-610d-40c7-ac71-6ce2fbb16184.mp4 
-i /tmp/media/import-2020-Aug-19-Wednesday-05-40-34/temp_1593b5d8-7e16-417d-9372-2267581cd504.mp4 
-i /tmp/media/import-2020-Aug-19-Wednesday-05-40-34/temp_1ac7f6be-1b12-4e31-b904-1491cc9b9494.mp4 
-i /tmp/media/import-2020-Aug-19-Wednesday-05-40-34/temp_ea5c93fd-d946-4742-b8f7-ea9ae4d43441.mp4  
-filter_complex 
"[0:v]trim=start=0:end=8.032,setpts=PTS-STARTPTS[clip0];
[1:v]trim=start=2:end=13.047,setpts=PTS-STARTPTS[clip1];
[2:v]trim=start=2:end=13.558,setpts=PTS-STARTPTS[clip2];
[3:v]trim=start=2:end=13.186,setpts=PTS-STARTPTS[clip3];
[4:v]trim=start=2,setpts=PTS-STARTPTS[clip4];
[0:v]trim=start=9.032:end=10.032,setpts=PTS-STARTPTS[out0];
[1:v]trim=start=14.047:end=15.047,setpts=PTS-STARTPTS[out1];
[2:v]trim=start=14.558:end=15.558,setpts=PTS-STARTPTS[out2];
[3:v]trim=start=14.186:end=15.186,setpts=PTS-STARTPTS[out3];
[1:v]trim=start=0:end=2,setpts=PTS-STARTPTS[in1];
[2:v]trim=start=0:end=2,setpts=PTS-STARTPTS[in2];
[3:v]trim=start=0:end=2,setpts=PTS-STARTPTS[in3];
[4:v]trim=start=0:end=2,setpts=PTS-STARTPTS[in4];
[in1]format=pix_fmts=yuva420p,fade=t=in:st=0:d=2:alpha=1[fadein1];
[in2]format=pix_fmts=yuva420p,fade=t=in:st=0:d=2:alpha=1[fadein2];
[in3]format=pix_fmts=yuva420p,fade=t=in:st=0:d=2:alpha=1[fadein3];
[in4]format=pix_fmts=yuva420p,fade=t=in:st=0:d=2:alpha=1[fadein4];
[out0]format=pix_fmts=yuva420p,fade=t=out:st=0:d=2:alpha=1[fadeout0];
[out1]format=pix_fmts=yuva420p,fade=t=out:st=0:d=2:alpha=1[fadeout1];
[out2]format=pix_fmts=yuva420p,fade=t=out:st=0:d=2:alpha=1[fadeout2];
[out3]format=pix_fmts=yuva420p,fade=t=out:st=0:d=2:alpha=1[fadeout3];
[fadein1]fifo[fadein1fifo];
[fadein2]fifo[fadein2fifo];
[fadein3]fifo[fadein3fifo];
[fadein4]fifo[fadein4fifo];
[fadeout0]fifo[fadeout0fifo];
[fadeout1]fifo[fadeout1fifo];
[fadeout2]fifo[fadeout2fifo];
[fadeout3]fifo[fadeout3fifo];
[fadeout0fifo][fadein1fifo]overlay[crossfade0];
[fadeout1fifo][fadein2fifo]overlay[crossfade1];
[fadeout2fifo][fadein3fifo]overlay[crossfade2];
[fadeout3fifo][fadein4fifo]overlay[crossfade3];
[clip0][crossfade0][clip1][crossfade1][clip2][crossfade2][clip3][crossfade3][clip4]concat=n=9[output];
[0:a][1:a]acrossfade=d=10:c1=tri:c2=tri[A1];
[A1][2:a]acrossfade=d=10:c1=tri:c2=tri[A2];
[A2][3:a]acrossfade=d=10:c1=tri:c2=tri[A3];
[A3][4:a]acrossfade=d=10:c1=tri:c2=tri[audio] " 
-vsync 0 -map "[output]" -map "[audio]" /tmp/media/final/some_filename_d0d2aab0-792a-4540-b2d3-e64abe98bf5c.mp4


  


  And all works pretty well, but if I have, for example :

  


  

  • picture

  


  • video

  


  • video

  


  • picture

  


  


  Then the sound from the second video is mapping to the first picture and sound from the third video to second video. And the third video actually goes without sound.

  


  It seems like it's happening because the silent sound of the first picture is pretty short. An I right ?
If so, how can I increase its duration ?

  


  I would much appreciate any help with this !

  


• Revision 62739 : Ajouter des liens de moderation pour Publier/Supprimer/Signaler en SPAM ...

  20 juin 2012, par cedric@… — Log

  Ajouter des liens de moderation pour Publier/Supprimer/Signaler ? en SPAM directement depuis l’email de notification
  Le lien est unique pour chaque combinaison id_forum-statut-email-site
  L’action qui verifie la legitimité du lien est à écrire, mais on teste déjà la bonne insertion des liens

• Traceback error with Python when using ffmpeg to convert a video

  16 mai 2013, par TheMickeyNick

  The simple way my script runs is the user provides a folder location and a filetype and glob.glob() finds the files with the filetype provided and adds them to a list. It then uses a for loop and goes through the list and converts each video. But it doesn't like when I try to run my ffmpeg command. Any help would be awesome. I'm also using Win 7 64 bit with 64 bit ffmpeg and Python 3.3
  Here's the error :

  OS Error
  
  Traceback (most recent call last):
  
    File "C:\Python33\lib\subprocess.py", line 1106, in _execute_child
  
      startupinfo)
  
  FileNotFoundError: [WinError 2] The system cannot find the file specified
  
  
  
  During handling of the above exception, another exception occurred:
  
  
  
  Traceback (most recent call last):
  
    File "C:\Users\user\Workspace\PythonConverter\HTMLandPythonConverter\Converter.py", line 77, in <module>
  
      massConvert(fileNames)
  
    File "C:\Users\user\Workspace\PythonConverter\HTMLandPythonConverter\Converter.py", line 47, in massConvert
  
      convertVideotoNewFormat(&#39;.mp4&#39;, x)
  
    File "C:\Users\user\Workspace\PythonConverter\HTMLandPythonConverter\Converter.py", line 61, in convertVideotoNewFormat
  
      myFile = subprocess.Popen(ffmpegString)#, stdout=subprocess.PIPE, stderr=subprocess.PIPE
  
    File "C:\Python33\lib\subprocess.py", line 820, in __init__
  
      restore_signals, start_new_session)
  
    File "C:\Python33\lib\subprocess.py", line 1112, in _execute_child
  
      raise WindowsError(*e.args)
  
  FileNotFoundError: [WinError 2] The system cannot find the file specified
  
  </module>

  Here is my code :

  import subprocess
  
  from subprocess import call
  
  import glob
  
  
  
  fileNames = []
  
  fileLocation = {}
  
  filetype = {}
  
  def convertString(location):
  
      s = list(location)
  
      for i in range(len(s)):
  
          if s[i] in '\\':
  
              s[i] = '/'
  
  
  
      if s[len(s)-1] != '/':
  
          s.append('/')
  
      location = "".join(s)
  
      return location
  
  
  
  def convertStringBack(stringTo):
  
      s = list(stringTo)
  
      for i in range(len(s)):
  
          if s[i] in '/':
  
              s[i] = '\\'
  
      stringTo = "".join(s)
  
      return stringTo
  
  
  
  def fileTypeTester():
  
      FieldType = '*' + input('What\'s the file type we are converting from?')
  
      typeSplit = list(FieldType)
  
      if typeSplit[1] != '.':
  
          typeSplit.insert(1,'.')
  
      FieldType = "".join(typeSplit)
  
      if FieldType not in ['*.flv','*.kdb']:
  
          print('Not a valid file type')
  
      else:
  
          return FieldType
  
      return None
  
  
  
  def massConvert(listOfFiles):
  
      print('Starting Conversion')
  
      for x in listOfFiles:
  
          #x = convertStringBack(x)
  
          print('Converting ' + x + ' to .mp4')
  
          convertVideotoNewFormat('.mp4', x)
  
      print('Finished File Conversion')
  
  
  
  
  
  def convertVideotoNewFormat(newFormat, fileLoc):
  
      newFilePath = fileLoc[0:len(fileLoc)-4]
  
      ffmpegString = ["ffmpeg64","-i", fileLoc,"-qscale","0","-ar","22050","-vcodec","libx264",newFilePath,newFormat]
  
      try:
  
          subprocess.check_call(newFilePath)
  
      except OSError:
  
          print('OS Error')
  
      except subprocess.CalledProcessError:
  
          print('Subprocess Error')
  
      myFile = subprocess.Popen(ffmpegString)
  
      print(myFile)
  
  
  
  #This will replace old HTML flv object tag with new video tag, but it is yet to be implemented
  
  def replaceHTML():
  
      pass
  
  
  
  fileLocation = input('What is the path of the files you\'d like to convert?')
  
  fileLocation = convertString(fileLocation)
  
  fileType = fileTypeTester()
  
  fileNames = glob.glob(fileLocation + fileType)
  
  massConvert(fileNames)

  I've looked around and most of the tutorials are in 2.7 the code is 3.3 and I can't find a tutorial to use ffmpeg for 3.3. My ffmpeg is set to 'ffmpeg64' on my PATH.

  Thanks !