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• Piping output of youtube-dl to a script using ffmpeg looks ok using echo but returns an error when executing

  29 mai 2020, par I0_ol

  I am trying to use youtube-dl to get the urls of some videos and then pipe the resulting urls into the input of my script. So in my terminal I do

  



  youtube-dl --ignore-config -iga ~/Desktop/youtube/videolist.txt | myscript.sh


  



  In my script I define things as

  



  command='ffmpeg'        
inputArgs='-i'              
outputArgs='-c:v libx264 -preset ultrafast -qp 0'       
directory="${HOME}/Desktop/Videos/"
output="video${count}"      
extension='mp4'         


  



  I test it with echo to make sure everything appears in the correct order.

  



  echo "${command}" "${inputArgs}" "${input}" "${outputArgs}" \
"${directory}""${output}${count}"."${extension}"


  



  And the output from that looks correct. But when I try to run the same thing without the preceding echo command, i.e.,

  



  "${command}" "${inputArgs}" "${input}" "${outputArgs}" \
"${directory}""${output}${count}"."${extension}"


  



  I get an error message that says

  



  


  At least one output file must be specified.

  


  



  So it seems pretty obvious to me that I'm doing something wrong when attempting to execute it.

  



  I have tried :

  



  

  • quoting the entire line as a whole

  


  • quoting different sections together

  


  • using the exec command in front of everything

  


  



  No matter what I do, an error occurs at some point in the process. I know it's something simple I'm doing wrong. Would someone please enlighten me as to what that might be ?

  



  I feel very strongly that the . shouldn't just be in the middle of everything like that, but I really don't know.

  



  Again, everything looks as it should when I run echo before the string of shell parameters.

  



  If more of the script I'm using is needed to understand what I'm talking about, that is not a problem.

  


• Piping output of youtube-dl to a script using ffmpeg looks ok using echo but returns an error when executing

  22 février 2016, par user556068

  I am trying to use youtube-dl to get the urls of some videos and then pipe the resulting urls into the input of my script. So in my terminal I do

  youtube-dl --ignore-config -iga ~/Desktop/youtube/videolist.txt | myscript.sh

  In my script I define things as

  command='ffmpeg'        
  
  inputArgs='-i'              
  
  outputArgs='-c:v libx264 -preset ultrafast -qp 0'       
  
  directory="${HOME}/Desktop/Videos/"
  
  output="video${count}"      
  
  extension='mp4'         

  I test it with echo to make sure everything appears in the correct order.

  echo "${command}" "${inputArgs}" "${input}" "${outputArgs}" \
  
  "${directory}""${output}${count}"."${extension}"

  And the output from that looks correct. But when I try to run the same thing without the preceding echo command, i.e.,

  "${command}" "${inputArgs}" "${input}" "${outputArgs}" \
  
  "${directory}""${output}${count}"."${extension}"

  I get an error message that says

  At least one output file must be specified.

  So it seems pretty obvious to me that I’m doing something wrong when attempting to execute it.

  I have tried :

  • quoting the entire line as a whole
  • quoting different sections together
  • using the exec command in front of everything

  No matter what I do, an error occurs at some point in the process. I know it’s something simple I’m doing wrong. Would someone please enlighten me as to what that might be ?

  I feel very strongly that the . shouldn’t just be in the middle of everything like that, but I really don’t know.

  Again, everything looks as it should when I run echo before the string of shell parameters.

  If more of the script I’m using is needed to understand what I’m talking about, that is not a problem.

• Scale image with ffmpeg in bash script

  17 juin 2014, par Brian Bennett

  I’m playing with jclem’s Gifify bash script as a quick way to make GIFs for documentation. It runs on ffmpeg and ImageMagick and I’m trying to find a way to add a variable to scale the produced GIF so I don’t have to go back and add it again. I thought I added the d (resize) variable correctly, but the script fails and just prints the help contents. It does not show my added variable in that help readout. Any ideas ?

  Update

  I solved the problem with printing help contents rather than running the script, but now I’m receiving an error about the -scale parameter.

  convert: invalid argument for option `-scale': -vf @ error/convert.c/ConvertImageCommand/2513.

  Is this because of my if statement syntax for the scale parameter below ?

  #!/bin/bash
  
  
  
  function printHelpAndExit {
  
    echo 'Usage:'
  
    echo '  gifify -conx filename'
  
    echo ''
  
    echo 'Options: (all optional)'
  
    echo '  c CROP:   The x and y crops, from the top left of the image, i.e. 640:480'
  
    echo '  o OUTPUT: The basename of the file to be output (default "output")'
  
    echo '  n:        Do not upload the resulting image to CloudApp'
  
    echo '  r FPS:    Output at this (frame)rate (default 10)'
  
    echo '  s SPEED:  Output using this speed modifier (default 1)'
  
    echo '            NOTE: GIFs max out at 100fps depending on platform. For consistency,'
  
    echo '            ensure that FPSxSPEED is not > ~60!'
  
    echo '  x:        Remove the original file and resulting .gif once the script is complete'
  
    echo '  d SCALE:  Scales GIF image to specified dimensions (default no scale)'
  
    echo ''
  
    echo 'Example:'
  
    echo '  gifify -c 240:80 -o my-gif -x my-movie.mov'
  
    exit $1
  
  }
  
  
  
  noupload=0
  
  fps=10
  
  speed=1
  
  
  
  OPTERR=0
  
  
  
  while getopts "c:o:r:s:d:nx" opt; do
  
    case $opt in
  
      c) crop=$OPTARG;;
  
      h) printHelpAndExit 0;;
  
      o) output=$OPTARG;;
  
      n) noupload=1;;
  
      r) fps=$OPTARG;;
  
      s) speed=$OPTARG;;
  
      x) cleanup=1;;
  
      d) scale=$OPTARG;;
  
      *) printHelpAndExit 1;;
  
    esac
  
  done
  
  
  
  shift $(( OPTIND - 1 ))
  
  
  
  filename=$1
  
  
  
  if [ -z ${output} ]; then
  
    output=$filename
  
  fi
  
  
  
  if [ -z $filename ]; then printHelpAndExit 1; fi
  
  
  
  if [ $crop ]; then
  
    crop="-vf crop=${crop}:0:0"
  
  else
  
    crop=
  
  fi
  
  
  
  if [ $scale ]; then
  
    scale="-vf scale=${scale}:0:0"
  
  else
  
    scale=
  
  fi
  
  
  
  # -delay uses time per tick (a tick defaults to 1/100 of a second)
  
  # so 60fps == -delay 1.666666 which is rounded to 2 because convert
  
  # apparently stores this as an integer. To animate faster than 60fps,
  
  # you must drop frames, meaning you must specify a lower -r. This is
  
  # due to the GIF format as well as GIF renderers that cap frame delays
  
  # < 3 to 3 or sometimes 10. Source:
  
  # http://humpy77.deviantart.com/journal/Frame-Delay-Times-for-Animated-GIFs-214150546
  
  echo 'Exporting movie...'
  
  delay=$(bc -l <<< "100/$fps/$speed")
  
  temp=$(mktemp /tmp/tempfile.XXXXXXXXX)
  
  
  
  ffmpeg -loglevel panic -i $filename $crop -r $fps -f image2pipe -vcodec ppm - >> $temp
  
  
  
  echo 'Making gif...'
  
  cat $temp | convert +dither -layers Optimize -delay $delay -scale $scale - ${output}.gif
  
  
  
  if [ $noupload -ne 1 ]; then
  
    open -a Cloud ${output}.gif
  
  
  
    echo `pbpaste`
  
  
  
    if [ $cleanup ]; then
  
      rm $filename
  
      rm ${output}.gif
  
    fi
  
  else
  
    echo ${output}.gif
  
  fi