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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 : converting jpeg image sequence to movie gets error "not enough frames to estimate rate consider increasing probesize" [on hold]

  29 décembre 2013, par enigmaticeasteregg

  I have an image sequence with a numbering system of : image-00001.jpg. I want to convert this to a movie using ffmpeg. I always get the error in the title no matter what I do. Below is the syntax I'm using. Any ideas ?

  ffmpeg.exe -f image2 -r 25 -start_number 1 -i sequence-%05d.jpg -vcodec mjpeg Q:\test.avi

• how to re-encode a movie to an encoding codec of another one with ffmpeg

  28 mai 2020, par gota

  Let's say I have 2 movies (movie1.mp4 and movie2.mp4), How can I use ffmpeg to reencode movie1.mp4 exactly with the same video codec, same bitrate, same audio codec as found in movie2.mp4 ?

  



  In other words, such that the output of ffprobe movie1.mp4 matches that of movie2.mp4 ?

  



  Why do I want this ? because I'm having problems concatenating both movies.