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• Anomalie #3495 : Il manque peut-être un accent à icône

  3 juillet 2015

  wikipedia préfère icône
  https://fr.wikipedia.org/wiki/Ic%C3%B4ne

  je serais pour laisser le chapeau pour éviter la confusion avec l’anglais

• FFmpeg : How to apply null audio within -filter_complex [duplicate]

  26 décembre 2018, par Prashant_Sarin

  This question already has an answer here :

  • adding silent audio in ffmpeg
    
    4 answers
    
  • ffmpeg - output silent audio track if source has no audio or audio is shorter than source video
    
    1 answer
    
  • Concatenate audio with image and video using ffmpeg
    
    1 answer
    

  I am trying to apply a -filter_complex to add fade In/Out effect to the video(created from an image) and add a null audio to the video in a single command. Can anyone please help.

  The command for applying fade In/Out effect is :

   var command = "-i ${convertedVideoList[0]} -i ${convertedVideoList[1]} -filter_complex [0:v]fade=in:st=0.0:d=0.5,fade=out:st=2.5:d=0.5[v1];[1:v]fade=in:st=0.0:d=0.5,fade=out:st=2.5:d=0.5[v2] -map [v1] ${getFilePath(fadedVideoList[0])} -map [v2] ${getFilePath(fadedVideoList[1])}"

• Movie from PNGs using FFmpeg and Python - rgb24 vs yuv420p

  7 février 2016, par Eilam G

  I wrote a little Python program to grab a bunch of PNGs and render them into a movie using the FFmpeg command line. The PNGs are read into [X*Y*3] numpy arrays (ignoring the alpha channel), new frames are added via interpolation, and the data is fed into FFmpeg as a pipe and saved as an mp4.

  The files play fine in VLC on Windows, but don’t work in iMovie on a Mac. I think it might have to do with most programs expecting H264 videos to be in the YUV420P color space, which my movies aren’t. I’ve tried changing the ffmpeg command -pix_fmt from rgb24 to yuv420p, but no go.

  Relevant Python code attached below.

  def init_vars(args):
  
      global log_file, file_names, command, num_int_frames, num_files, silent
  
  
  
      file_names = glob('./*.png')
  
      num_files = len(file_names)
  
  
  
      if args.log:
  
          log_file = 'bmmp.log'
  
      else:
  
          log_file = os.devnull
  
  
  
      silent = args.silent
  
  
  
      frames_per_second = args.fps
  
      wanted_movie_length = args.length
  
      movie_file_name = args.name + '.mp4'
  
  
  
      num_int_frames = round((frames_per_second * wanted_movie_length - 1) / (num_files - 1) - 1)
  
  
  
      if sys.platform == 'win32':
  
          ffmpeg_bin = 'ffmpeg.exe'
  
      else:
  
          ffmpeg_bin = 'ffmpeg'
  
  
  
      command = [ffmpeg_bin,
  
                 '-y', # (optional) overwrite output file if it exists
  
                 '-f', 'rawvideo',
  
                 '-vcodec','rawvideo',
  
                 '-s', '1280x720', # size of one frame
  
                 '-pix_fmt', 'rgb24',
  
                 '-r', str(frames_per_second), # frames per second
  
                 '-i', '-', # The input comes from a pipe
  
                 '-an', # Tells FFMPEG not to expect any audio
  
                 movie_file_name]

  Cheers,
  Eilam