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• Rename script with [Errno2] No such file or directory

  23 janvier 2015, par Carlos Augusto de Gois

  I have a folder with over 40 thousand images on an external drive, to use as a sequence for a timelapse. Before using ffmpeg though, I need to add trailing zeros to all the files. My attempt at a solution is shown below :

  import os
  
  
  
  path = '/Volumes/Arquivo\ \(carlosbgois@gmail.com\)/stadium_billiard/video/'
  
  for filename in os.listdir(path):
  
      num = filename[:-4]
  
      num = num.zfill(4)
  
      new_filename = num + ".png"
  
      os.rename(os.path.join(path, filename), os.path.join(path, new_filename))

  When running, I get the error [Errno2] No such file or directory on line 5. The files are named as 0.png, 1.png, ..., 32220.png, and so on. Any ideas on what may be causing this ?

  Have a nice day ( :

• shell script : ffmpeg can't either read arguments or filenames, if spaces in path- or filename

  9 juillet 2014, par Nicolas

  I’m currently working on a bash shell script on OS X to get a custom tailored Pashua GUI/automatization package, using ffmpeg in the back, to transcode videos, label them, zip them, upload them, organize them and so on. Everything is working like a charm so far.

  My problem now is that I can’t make ffmpeg take files or paths that have spaces in them IF I use variables in variables. But that (I think) is a must in order to get ffmpeg to transcode multiple files at once depending on the formats and checkboxes the user ticks on.

  I made a little example snippet so you can see my dilemma.

  No spaces in path or filename / works great :

  #!/bin/bash
  
  
  
  infile='/Users/nicolas/Desktop/MASTER_[DE]_Test_140626.mov'
  
  
  
  gen_outfile () {
  
      outfile="${1/MASTER/TRANSCODE}"
  
      ffmpeg_cl="-s $2 -c:v libx264 -preset slow -crf 18 -pix_fmt yuv420p -c:a aac -b:a 240k -strict -2 $outfile"
  
  }
  
  
  
  gen_outfile "$infile" 1920x1080
  
  
  
  ./ffmpeg_stat -i "$infile" $ffmpeg_cl

  The output is as expected and the file is called "TRANSCODE_[DE]_Test_140626.mov"

  Filename variable with spaces - directly fed to ffmpeg :

  This works as well but isn’t really usable for me because I need to have the option of variable numbers of output files and arguments generated dynamically.

  #!/bin/bash
  
  
  
  infile_full='/Users/nicolas/Google Drive/encode-o-mat/MASTER_[DE] Test  140626.mov'
  
  
  
  gen_outfile () {
  
      outfile="${1/MASTER/TRANSCODE}"
  
      ffmpeg_cl="-s $2 -c:v libx264 -preset slow -crf 18 -pix_fmt yuv420p -c:a aac -b:a 240k -strict -2"
  
  }
  
  
  
  gen_outfile "$infile_full" 1920x1080
  
  
  
  ./ffmpeg_stat -i "$infile_full" $ffmpeg_cl "$outfile"

  The output is as expected and the file is called "TRANSCODE_[DE] Test 140626.mov".
  But this way is just not an option.

  This here does not work ! Filename is split up and incomplete :

  #!/bin/bash
  
  
  
  infile_full='/Users/nicolas/Google Drive/encode-o-mat/MASTER_[DE] Test  140626.mov'
  
  
  
  gen_outfile () {
  
      outfile="${1/MASTER/TRANSCODE}"
  
      ffmpeg_cl="-s $2 -c:v libx264 -preset slow -crf 18 -pix_fmt yuv420p -c:a aac -b:a 240k -strict -2 $outfile"
  
  }
  
  
  
  gen_outfile "$infile_full" 1920x1080
  
  
  
  ./ffmpeg_stat -i "$infile_full" $ffmpeg_cl

  Ffmpeg gives this error : "Unable to find a suitable output format for ’/Users/nicolas/Google’".
  Of course.

  This doesn’t work as well ! Quoting and such :

  ./ffmpeg_stat -i "$infile_full" "$ffmpeg_cl"

  If I put the $ffmpeg_cl variable in various quotes ffmpeg doesn’t understand the arguments anymore ! This is one example output :

  "Unrecognized option ’s 1920x1080 -c:v libx264 -preset slow -crf 18 -pix_fmt yuv420p -c:a aac -b:a 240k -strict -2 /Users/nicolas/Google Drive/encode-o-mat/TRANSCODE_[DE] Test 140626.mov’.
  Error splitting the argument list : Option not found
  Conversion failed !"

  It’s really important that the script can handle path- and filenames with spaces because I can’t change the environment in which that tool is supposed to run. All ideas and solutions are more than welcome !

• Difference in number of channels returned by mediainfo and ffprob

  16 mars 2021, par Hai Tran

  I was examining an audio file and noticed that the numbers of channels returned by mediainfo and ffprobe were different.

  


  The mediainfo command :

  


  mediainfo audio.mp4


  


  The ffprobe command (see the channels value) :

  


  ffprobe -i audio.mp4 -show_streams


  


  Does anyone know what's happening ?
Here is the audio file for your own test.