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• Bash script not working with ffmpeg + images

  30 mars 2017, par user1816546

  I created a bash file with the name "run.sh" with the following instructions :

  ffmpeg -i texture/texture%03d.bmp -vf "scale='min(1920,iw)':min'(1080,ih)':force_original_aspect_ratio=decrease,pad=1920:1080:(ow-iw)/2:(oh-ih)/2" pad_texture/pad_texture%03d.bmp
  
  ffmpeg -i depth/depth%03d.bmp -vf "scale='min(1920,iw)':min'(1080,ih)':force_original_aspect_ratio=decrease,pad=1920:1080:(ow-iw)/2:(oh-ih)/2" ../pad_depth/pad_depth%03d.bmp

  However, when I run my bash file I get the following error :

  Input #0, image2, from 'texture/texture%03d.bmp':
  
    Duration: 00:00:20.00, start: 0.000000, bitrate: N/A
  
      Stream #0:0: Video: bmp, bgr24, 1024x768, 25 fps, 25 tbr, 25 tbn, 25 tbc
  
  [NULL @ 0x1defec0] Unable to find a suitable output format for 'pad_texture/pad_'exture%03d.bmp
  
  : Invalid argumentxture%03d.bmp

  I cannot understand why when I copy and paste the commands line by line into the command prompt, they are accepted, but in a bash script they are not. Any feedback is greatly appreciated !

• bash script for ffmpeg conversion does not loop

  12 septembre 2015, par Alex Monthy

  I have this bash script for a batch conversion of some mp4 files :

  #!/bin/bash
  
  ls dr*.mp4 | grep -v -E "\.[^\.]+\." | sed "s/.mp4//g" | while read f 
  
  do
  
      TARGET="$f.ffmpeg.mp4"
  
      if ! [ -f $TARGET ]
  
      then
  
          echo $TARGET
  
          ffmpeg  -nostdin -i $f.mp4 -s 320x180 -vc h264 -acodec copy -f mp4 -y $TARGET
  
      fi
  
  
  
      TARGET="$f.ffmpeg.flv"
  
      if ! [ -f $TARGET ]
  
      then
  
          echo $TARGET
  
          ffmpeg  -nostdin -i $f.mp4 -s 320x180 -acodec copy -y $TARGET
  
      fi
  
  
  
      TARGET="$f.jpg"
  
      if ! [ -f $TARGET ]
  
      then
  
          echo $TARGET
  
          ffmpeg -nostdin -i $f.ffmpeg.mp4 -ss 0 -vframes 1 -f image2 $TARGET
  
      fi
  
  
  
      TARGET="$f.ffmpeg.ogv"
  
      if ! [ -f $TARGET ]
  
      then
  
          echo $TARGET
  
          ffmpeg  -nostdin -i $f.mp4 -s 320x176 -ar 11025 -acodec libvorbis -y $TARGET
  
      fi
  
  done 

  It runs once but does and converts the input file name to 4 different formats, but does not loop to the next input file name.
  I tried to shuffle the order of the various conversions, but still the script runs exactly once for one file name.
  I tried to run ffmpeg with the -nostdin flag, but it says

  "Unrecognized option 'nostdin'"

  The ffmpeg version is ffmpeg version 0.10.6-6:0.10.6-0ubuntu0jon1 lucid2 - I just update the ffmpeg package from http://ppa.launchpad.net/jon-severinsson/ffmpeg/ubuntu and cannot find an newer version. The base system is

  Distributor ID: Ubuntu 
  
  Description:    Ubuntu 10.04.1 LTS 
  
  Release:        10.04 
  
  Codename:       lucid

• Creating forks of `ffmpeg` in loop inside a shell script "loses" some iterations

  19 octobre 2015, par sschaef

  I have a shell script that takes a directory as input, reads all mp4 files in it and convert them to a mp3 with ffmpeg :

  #!/bin/bash
  
  
  
  dir=$1
  
  
  
  while read -rd "" file
  
  do
  
    base=$(basename "$file")
  
    filename=${base%(*}".mp3"
  
    ffmpeg -i "$file" -vn -ar 44100 -ac 2 -ab 192000 -f mp3 "$filename" &
  
  done < <(find $dir -maxdepth 1 -iname "*.mp4" -print0)
  
  
  
  wait
  
  
  
  exit 0

  Currently all these calls to ffmpeg are forked because when I leave out the & at the end only the first file in converted and the others are ignored.

  But this is problematic because somethings this fails on some files error messages like the following :

  path/to/file/file name - with spaces(info)(temp_information).mp4 : No such file or directory

  All file names normally contain spaces, maybe that is the reason why it fails for some files.

  Thus, I have the following questions :

  1. When I don’t fork the ffmpeg calls why is only the first file executed ? I expected that the loop waits until the process is finished and then continues with the next iteration.
  2. Why is the script unable to find some files (maybe it is a problem of ffmpeg) ?
  3. How to solve all these problems and make the script to work ?