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• 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

• 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])}"

• WebM on the web

  23 mai 2010, par Basil Gohar — Software, Updates, flumotion, gstreamer, mpeg-la, ogg, vp8, webm, xiph

  News & developments about WebM are coming too fast to cover all of them, but it’s definitely encouraging to see that the free software world (as well as some other surprising, but welcome, players) has unequivocally embraced WebM as the … Read more (...)