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• Python convert audio files to MP3

  19 janvier 2015, par Fernando Retimo

  I’m trying to write a small utility that get as input an m4a/ogg file and converts it to a MP3 audio file.
  My main goal is not to use any third party binaries such as ’Lame’ or ’ffmpeg’.
  I read allot about PyMedia and such, but my knowledge on audio codecs is very poor.
  Can any one help me and give me an elegant cross platform solution ?
  Thanks !

  EDIT :
  meanwhile I know it is very basic but this is my code :

  import sys
  
  
  
  def convert2mp3(input_file):
  
      .....
  
      some magic...
  
      ...
  
      return mp3file
  
  
  
  if __name__ == "__main__":
  
      if len(sys.argv) != 2:
  
          print "%prog Usage: %s <input file="file" />"
  
          sys.exit()
  
  
  
      convert2mp3(sys.argv[1])

• Curator of the Samples Archive

  13 mai 2011, par Multimedia Mike — General

  Remember how I mirrored the world-famous MPlayerHQ samples archive a few months ago ? Due to a series of events, the original archive is no longer online. However, me and the people who control the mplayerhq.hu domain figured out how to make samples.mplayerhq.hu point to samples.multimedia.cx.

  That means... I’m the current owner and curator of our central multimedia samples repository. Such power ! This should probably be the fulfillment of a decade-long dream for me, having managed swaths of the archive, most notably the game formats section.

  How This Came To Be

  If you pay any attention to the open source multimedia scene, you might have noticed that there has been a smidge of turmoil. Heated words were exchanged, authority was questioned, some people probably said some things they didn’t mean, and the upshot is that, where once there was one project (FFmpeg), there are now 2 projects (also Libav). And to everyone who has wanted me to mention it on my blog— there, I finally broke my silence and formally acknowledged the schism.

  For my part, I was just determined to ensure that the samples archive remained online, preferably at the original samples.mplayerhq.hu address. There are 10 years worth of web links out there pointing into the original repository.

  Better Solution

  I concede that it’s not entirely optimal to host the repository here at multimedia.cx. While I can offer a crazy amount of monthly bandwidth, I can’t offer rsync (invaluable for keeping mirrors in sync), nor can the server provide anonymous FTP or allow me to offer accounts to other admins who can manage the repository.

  The samples archive is also mirrored at samples.libav.org/samples. I understand that service is provided by VideoLAN. Right now, both repositories are known to be static. I’m open to brainstorms about how to improve the situation.

• How to "re-interlace" a video ? How to convert a naïvely deinterlaced 480p video back to 480i ? [closed]

  8 juillet 2021, par toughluck

  I have a 480p video that was naïvely created from a 480i original and had no deinterlacing applied. The resulting format is 480p25. Combing is visible and I would like to convert it back to 480i50, so sort of "re-interlace" the video back to its original state.

  


  I have tried the solution from this question : How to convert a 1080p to 1080i using FFMPEG but it did not create the expected output.

  


  I looked at ffmpeg reference here : https://www.ffmpeg.org/ffmpeg-all.html but I could not find a proper option. Tons of filters to deinterlace interlaced videos but nothing to "re-interlace" them.

  


  My expected output would be this :

  


   ------> time
Input:
Frame 1 (0 ms)        Frame 2 (40 ms)

11111                 33333
22222                 44444
11111                 33333
22222                 44444

Output 1:
Frame 1 (0 ms)  Frame 2 (20 ms) Frame 3 (40 ms) Frame 4 (60 ms)
11111           22222           33333           44444
11111           22222           33333           44444
11111           22222           33333           44444
11111           22222           33333           44444

(Alternative) Output 2:
Frame 1 (0 ms)  Frame 2 (20 ms) Frame 3 (40 ms) Frame 4 (60 ms)
22222           11111           44444           33333
22222           11111           44444           33333
22222           11111           44444           33333
22222           11111           44444           33333


  


  (I'm not sure whether it's top field first or bottom field first, so I'd like to have an option to try both.)

  


  Is this possible ?