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• Linux : How to combine multiple FLAC audio files into 1 file, with differing sample rates, but not changing pitch

  15 avril 2017, par jake

  I’ve looked everywhere to try to combine a bunch of FLAC files with differing sample rates into 1 file. What I’ve tried so far is :

  ffmpeg concat with a wildcard :

  ffmpeg -f concat -i <( for f in *.flac; do echo "file '$(pwd)/$f'"; done ) -safe 0 output.flac

  I get for every filename, (even if I change pwd to ’./’ for relative) :

  ffmpeg unsafe filename

  Regardless of the file’s filename.

  I’ve tried sox :

  sox *.flac output.flac

  Which leads to :

  sox FAIL sox: Input files must have the same sample-rate

  I’ve even tried combining the two :

  #!/usr/bin/env bash
  
  
  
  set -eu
  
  
  
  for i in *.flac *.ogg *.mp3
  
  do
  
    ffmpeg -i "$i" "$i.wav"
  
  
  
  done
  
  
  
  sox *.wav combined.wav

  Same error as above.

  Anyone have any tips ? I’m sure that in some Windows program you can drag in 5 differing sound files and combine them with ease. Is there not a simple way to do this on linux cmdline ?

• how to pass user input variable to ffmpeg in windows batch file

  7 décembre 2018, par lala

  Reffering to Answer here (Closest Search) i have in a batch file code(below). I tried every possible way to pass line1 value to text and it simply didn’t worked. clearly hardcoding text in ffmpeg line works. Any Ideas or Guideline.

  set /p dtp="DRAG A File:"
  
  set /p line1 = "Enter Top Text:"
  
  set /p line2 = "Enter Bottom Text:"
  
  ffmpeg -i %dtp% -filter_complex "[0:v]pad=iw:ih+100:0:(oh-ih)/2:color=white, drawtext=text='%%line1%%':fontfile=Mosk Bold 700.ttf:fontsize=24:fontcolor=black:x=(w-tw)/2:y=(50-th)/2, drawtext=text=`%line2%`:fontfile=Mosk Bold 700.ttf:fontsize=24:fontcolor=black:x=(w-tw)/2:y=h-25-(th/2)" %dtp%_tweaked.mp4

• Can I create a proccess to kill blocked processes in a queue with Python ?

  15 mars 2017, par user3182473

  I would like to create a process, which kills blocked processes in a queue. These processes are actually ’ffmpeg’ command in my work, which are unstable and blocked occasionally.

  For simplicity I use ’echo’ instead of ’ffmpeg’ as example here. I found that the alive process become ’finished’ from the queue, and the subprocess returncode is 0. Why ?

  And can anyone tell how I can modify my code with python2.7 to fit this requirement ? Any suggestion would be appreciated.

  import subprocess
  
  import os
  
  import multiprocessing
  
  import time
  
  
  
  cmds = ['echo "a" &sleep 10','echo "b"']
  
  queue = multiprocessing.Queue(maxsize=3)
  
  
  
  class ProcessKiller(multiprocessing.Process):
  
      def __init__(self,queue):
  
          multiprocessing.Process.__init__(self)
  
          self.queue = queue
  
  
  
      def run(self):
  
          while True:
  
              try:
  
                  proc = self.queue.get(block=False)
  
                  print 'bbbbb',proc.poll(),proc.pid #WHY HERE THE RETURNCODE=0?
  
                  if proc.poll() is None:
  
                      print 'tokill'
  
                      time.sleep(5)
  
                      if proc.poll() is None:
  
                          os.killpg(os.getpgid(proc.pid),signal,SIGTERM)
  
                          print 'killed'
  
              except Exception as e:
  
                  time.sleep(0.5)
  
  
  
  pk = ProcessKiller(queue)
  
  pk.start()
  
  
  
  for item in cmds:
  
      cmd = subprocess.Popen(item,preexec_fn=os.setsid,shell=True)
  
      print 'aaaaa',cmd.poll(), cmd.pid
  
      queue.put(cmd,block=False)
  
  
  
      time.sleep(3)        
  
      print 'cccc',cmd.poll()
  
  
  
      time.sleep(10)
  
      print 'dddd', cmd.poll()
  
      cmd.communicate()
  
  
  
      print 'finished'

  The result from this script :

  aaaaa None 120748
  
  a
  
  bbbbb 0 120748
  
  cccc None
  
  dddd 0
  
  finished
  
  aaaaa None 120755
  
  b
  
  bbbbb 0 120755
  
  cccc 0
  
  dddd 0
  
  finished

  UPDATE : Now I use a while loop to monitor the status of the subprocess. It works. However, I am still curious why the status of the process changes from the queue.