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• Convert simple Bash script to PowerShell ?

  10 février 2015, par vulcan raven

  I have pulled the Bash script from here, which checks the AVI file for bad frames using ffmpeg and cygwin extension. I am able to execute the code in Mingw. I put ffmpeg.exe (ren ffmpeg), cygwin1.dll & cygz.dll in Mingw’s bin dir (/c/mingw/bin/). Now, I am looking to port this bash code to PowerShell. Can anyone shed some PowerShell light on this one ?

  Script : (path : /c/mygw/bin/AviConvert)

  #!/bin/bash
  
  
  
  FFMPEG="ffmpeg"
  
  LIST=`find | grep \.avi$`
  
  
  
  for i in $LIST; do
  
      OUTP="$i.txt"
  
      OUTP_OK="$i.txt.ok"
  
      TMP_OUTP="$i.tmp"
  
      if [ -f "$OUTP" -o -f "$OUTP_OK" ] ; then
  
      echo Skipping "$i"
  
      else
  
      echo Checking "$i"...
  
      RESULT="bad"
  
      ffmpeg -v 5 -i "$i" -f null - 2> "$TMP_OUTP" && \
  
          mv "$TMP_OUTP" "$OUTP" && \
  
          RESULT=`grep -v "\(frame\)\|\(Press\)" "$OUTP" | grep "\["`
  
      if [ -z "$RESULT" ] ; then
  
          mv "$OUTP" "$OUTP_OK"
  
      fi
  
      fi
  
  done

• Getting video metadata in ruby script using ffmpeg, ffprobe or rvideo

  24 janvier 2013, par alex

  I want to get metadata of videos referenced by a URL using Ruby. At this point, I found many related posts, but could not find out how to solve my problem.

  I tried to use RVideo, but when I do :

  file = RVideo::Inspector.new(:file => 'http://www.agreatsite.com/avideo.mp4' ;)

  It throws

  'ArgumentError : File not found (http://www.agreatsite.com/avideo.mp4)...

  So I can't get the information using RVideo (but it works well when I have the file hosted on my local computer).

  I then tried to use ffprobe, but I don't know how to read the output.
  So far, I have the following method, which "shows" the information I want when I run it in the console, but it actually returns "true" and I can't find out how to capture the output I need...

    def media_info
  
      source = self
  
      command = <<-end_command
  
        ffprobe -v quiet -print_format json -show_format -show_streams  #{source}
  
      end_command
  
      command.gsub!(/\s+/, " ")
  
      system(command)
  
    end

  Would love some help, to make this work with either ffprobe or RVideo !

  UPDATE :
  I found a way to get what I needed. Not sure this is the best way to do it :

  def get_media_duration

  source = self.media[0][:url]    
  
  
  
  command = <<-end_command
  
    ffprobe -v quiet  -show_streams  #{source}
  
  end_command
  
  command.gsub!(/\s+/, " ")
  
  
  
  duration = ""
  
  IO.popen(command) { |io| while (line = io.gets) do
  
                          puts "++ "+line.inspect
  
                          duration = line.split("duration=")[1].gsub("\n", "") if line.split("duration=").length > 1
  
                        end
  
                    }
  
  duration   

  end

  I guess I could make it work that way, but doesn't seem very elegant to me. Better suggestions would be greatly appreciated !

• How do I make a bash script continue part of a loop only if there is no error in the first step of the loop ?

  30 mars 2012, par Eli Greenberg

  I currently have a .command file for Mac that contains the following :

  for f in ~/Desktop/Uploads/*.flv
  
  do
  
       /usr/local/bin/ffmpeg -i "$f" -vcodec copy -acodec libfaac -ab 128k -ar 48000 -async 1 "${f%.*}".mp4
  
       rmtrash "$f"
  
  done

  How can I tell bash to only execute rmtrash if ffmpeg doesn't produce an error ?