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• Bash Script - Rename files that are beginning with a number to two digits [duplicate]

  9 septembre 2018, par Flavorum1

  This question already has an answer here :

  • Sorting strings with numbers in Bash [duplicate]
    
    3 answers
    

  I have a couple of folders that are audiobooks. The files are numbered and I want to convert them to one file.
  I used the following script to convert them :

      #!/bin/bash 
  
      if [ ! -d mp3 ]; then
  
      mkdir -p mp3;
  
      fi;
  
      for f in ./*.flac; do echo "file '$f'" >> mylist.txt; done
  
      ffmpeg -f concat -safe 0 -i mylist.txt -b:a 320k mp3/title.mp3
  
      [ -e mylist.txt ] && rm mylist.txt

  My problem is that I have to rename the first ten files because they are not in the right order. The files are named 1 - Title, 2 - Title, 3 - Title and so on. To get the right order I have to rename them to 01 - Title, 02 - Title, ..., 09 - Title.
  How can I do that with a bash script ? Furthermore it would be nice, if the playlist.m3u file would be changed accordingly.

  Thanks for your help.

  @Cyrus posted the right Link to solve my problem.
  The solved script ist :

  #!/bin/bash
  
  if [ ! -d mp3 ]; then
  
  mkdir -p mp3;
  
  fi;
  
  for f in ./*.flac; do echo "file '$f'" >> mylist2.txt; done
  
  sort -V mylist2.txt >> mylist.txt
  
  rm mylist2.txt
  
  ffmpeg -f concat -safe 0 -i mylist.txt -b:a 320k mp3/title.mp3
  
  [ -e mylist.txt ] && rm mylist.txt

• Get decibel array from audiofile

  16 avril 2020, par R. Adang

  I am creating a React Native app and want to show list of decibel numbers based on an audio file.
so the goal is -> input : audiofile(mp3,wav etc) output : array of decibels for samples with X milliseconds. I know about FFMPEG, but I do not know how to use it to get the array. I see there is a waveform option, but this returns a png instead of the volume data.

  


• lavc/cbrt_tablegen : speed up tablegen

  11 janvier 2016, par Ganesh Ajjanagadde

  lavc/cbrt_tablegen : speed up tablegen
  This exploits an approach based on the sieve of Eratosthenes, a popular
  
  method for generating prime numbers.
  Tables are identical to previous ones.
  Tested with FATE with/without —enable-hardcoded-tables.
  Sample benchmark (Haswell, GNU/Linux+gcc) :
  
  prev :
  
  7860100 decicycles in cbrt_tableinit,       1 runs,      0 skips
  
  7777490 decicycles in cbrt_tableinit,       2 runs,      0 skips
  
  [...]
  
  7582339 decicycles in cbrt_tableinit,     256 runs,      0 skips
  
  7563556 decicycles in cbrt_tableinit,     512 runs,      0 skips
  new :
  
  2099480 decicycles in cbrt_tableinit,       1 runs,      0 skips
  
  2044470 decicycles in cbrt_tableinit,       2 runs,      0 skips
  
  [...]
  
  1796544 decicycles in cbrt_tableinit,     256 runs,      0 skips
  
  1791631 decicycles in cbrt_tableinit,     512 runs,      0 skips
  Both small and large run count given as this is called once so small run
  
  count may give a better picture, small numbers are fairly consistent,
  
  and there is a consistent downward trend from small to large runs,
  
  at which point it stabilizes to a new value.
  Reviewed-by : Michael Niedermayer <michael@niedermayer.cc>
  
  Signed-off-by : Ganesh Ajjanagadde <gajjanagadde@gmail.com>
  

  • [DH] libavcodec/cbrt_tablegen.h