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• Lego Mindstorms RSO Format

  14 juillet 2010, par Multimedia Mike — General

  I recently read a magazine article about Lego Mindstorms. Naturally, the item that caught my eye was the mention of a bit of Lego software that converts various audio file formats to a custom format called RSO that can be downloaded into a Mindstorms project to make the creation output audio. To read different sources, one might be left with the impression that there is something super-duper top secret proprietary about the format. Such impressions do not hold up under casual analysis of a sample file.

  A Google search for "filetype:rso" yielded a few pre-made sample that I have mirrored into the samples archive. The format appears to be an 8-byte header followed by unsigned, 8-bit PCM. More on the wiki. If FFmpeg could gain an RSO file muxer, that would presumably be a heroic feat to the Lego hacking community.

• Python get wav frames from mp3 file for wave.open -> readframes()

  25 janvier 2017, par spam junk

  I have programmed a little lightshow which reads from .wav files :

  data = wavfile.readframes(chunk)

  but i would like to read mp3 files.

  So i have found various python apis like pymedia (cant quite get it to work) and pyffmpeg (never been worked on since 2015 as the github readme says )
  and i have found this post :

  Python : mp3 to alsaaudio through ffmpeg pipe and wave.open(f,’r’)

  im new to python and im only using it because my lights are controlled in python and im studying
  computer science since last year , so im still learning

  so all in all if someone could reassemble the code from the post for me that would be nice .

  im sorry,
  i would comment on the post but i dont have enough reputation

• Keep bash script running child processes until bash script end

  17 septembre 2014, par Xeoncross

  I would like to keep a command running (in this case ffmpeg) until a certain time.

  The best way I know to do this is to wrap that command in a bash script that will keep checking to make sure it’s running.

  If it dies before that time, the script should restart it. I’m having trouble figuring out how do this. It seems like keeping a process running/restarting as needed until a term signal is a pretty common task.

  I can’t use a crontab entry because I have to wait until X outside source starts this process (and ultimately sends the terminate signal).

  #!/bin/bash
  
  
  
  #launch_ffmpeg()
  
  #{
  
  #   ffmpeg -i rtmp://localhost/$1/$2 -c copy -f flv rtmp://localhost/$1/$2 &
  
  #   return $!
  
  #}
  
  
  
  on_die ()
  
  {
  
      # kill all children
  
      pkill -KILL -P $$
  
  }
  
  
  
  trap 'on_die' TERM
  
  
  
  # I think this is wrong
  
  while :
  
      do
  
          ffmpeg -i rtmp://localhost/$1/$2 -c copy -f flv rtmp://localhost/$1/$2 &
  
          wait $!
  
          sleep 10
  
  done