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• Redirect shell output for ruby script

  2 juin 2015, par rs41

  I have simple ruby script :

   #! /usr/bin/env ruby
  
   require 'fileutils'
  
  
  
   FileUtils.rm "output.mkv" if File.exists?("outp    ut.mkv")
  
   pid = Process.spawn("ffmpeg -i wrong_file.mp4 -c:v libx264 -preset veryslow -qp 0 output.mkv", STDOUT => "output.txt", STDERR => "error.txt")
  
  
  
   puts "pid : #{pid}"
  
   Process.wait(pid)

  But, STDOUT and STDERR outputs into error.txt, why ?

  It looks, that ffmpeg have another exit codes ?(in usual case 0 for stdout, and 1 for stdin)

  Note : I don’t want to use native shell redirect like ’> output.txt 2> error.txt’ because i want to get pid of ffmpeg process, not shell process and kill it in future.

• ffmpeg shell script globbing

  10 novembre 2015, par AD0AE

  I have a pretty straight forward question. I have a bunch of individual directories that are labeled as ./001 ./002 ... ./201
  within each directory contains files that have the identifier *_IO.PNG

  I can use the shell command : ffmpeg -framerate 20 -pattern_type glob -i './066/*IO.PNG' -c:v libx264 -pix_fmt yuv420p 066.mp4 and this works great. It does exactly what I want.

  However, I tried to write a shell script, which is below but this does not work. It seems to be loading individual files instead of all of them at once. Any help would be appreciated.

   #!/bin/bash
  
   for i in {1..5}
  
   do
  
     FILE=$(printf %03d $i)
  
     echo " This file: $FILE"
  
     infile='./$FILE/*IO.PNG'
  
     echo $infile
  
     ffmpeg -framerate 20 -pattern_type glob -i $infile -c:v libx264 -pix_fmt yuv420p './$FILE.mp4'
  
   done 

• shell script ffmpeg stops after 2 jobs

  19 octobre 2015, par Chris James Champeau

  I have a pretty simple shell script and after doing the first two jobs, it just stops and sits there, doesnt do anything, it doesnt seem to matter what the third job is, if I switch the order etc, it will not finish it.

  Any ideas would be great...

  Here is my shell script

  for f in "$@"
  
  do
  
  name=$(basename "$f")
  
  dir=$(dirname "$f")
  
  /opt/local/bin/ffmpeg -i "$f" -y -b 250k -deinterlace -vcodec vp8 -acodec libvorbis -nostdin "$dir/webm/${name%.*}.webm"
  
  /opt/local/bin/ffmpeg -i "$f" -y -b 250k -strict experimental -deinterlace -vcodec h264 -acodec aac -nostdin "$dir/mp4/${name%.*}.mp4"
  
  /opt/local/bin/ffmpeg -i "$f" -y -ss 00:00:15.000 -deinterlace -vcodec mjpeg -vframes 1 -an -f rawvideo -s 720x480 "$dir/img/${name%.*}.jpg"
  
  done