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• Bash script to automate FFmpeg operations fails when calling the command, but copy-pasting the generated command into the terminal works [duplicate]

  28 février, par GaboScharff99

  I wrote a bash script which automates a number of conversion operations on video files using FFmpeg. Oddly enough, the FFmpeg call itself now fails when running the script, with a very confusing error message, I might add, but when I copy the command generated by the script into the terminal and run it, it works flawlessly. I'm sorry to insert such a long code block here, but considering how strange this error is, it might be anywhere in the script, so here it is :

  


  #!/bin/bash

audioTrack=1
subSource=1
subTrack=0
transcodeVideo=1
transcodeAudio=1
volumeMultiplier=1
degradeToStereo=0
subLanguage="Japanese"

while getopts "t:ns:vam:dl:h" opt; do
    case "$opt" in
        t) audioTrack=${OPTARG};;
        n) subSource=0;;
        s) subTrack=${OPTARG};;
        v) transcodeVideo=0;;
        a) transcodeAudio=0;;
        m) volumeMultiplier=${OPTARG};;
        d) degradeToStereo=1;;
        l) subLanguage=${OPTARG};;
        h)
            echo "Options:"
            echo "-t [integer]: Audio track number. Default: 1."
            echo "-n: If included, subtitles will be taken from internal source."
            echo "-s [integer]: Subtitles track number. Default: 0."
            echo "-v: If included, video source will be copied without transcoding."
            echo "-a: If included, audio source will be copied without transcoding."
            echo "-m [number]: Volume multiplier. If 1, volume is unaffected. Default: 1"
            echo "-d: If included, audio will be degraded to stereo."
            echo "-l [language]: Subtitles language. Only used for external subtitles source. Default: Japanese."
            exit 0
        ;;
    esac
done

echo "Audio track: $audioTrack."
echo "Subtitles track: $subTrack."
params="-map 0:0 -map 0:$audioTrack -map $subSource:$subTrack -c:v"

if [[ $transcodeVideo -eq 1 ]]; then
    echo "Video will be transcoded."
    params="$params hevc"
elif [[ $transcodeVideo -eq 0 ]]; then
    echo "Video will be copied without transcoding."
    params="$params copy"
fi

params="$params -c:a"

if [[ $transcodeAudio -eq 1 ]]; then
    echo "Audio will be transcoded."
    params="$params libopus"
elif [[ $transcodeAudio -eq 0 ]]; then
    echo "Audio will be copied without transcoding."
    params="$params copy"
fi

if [[ $volumeMultiplier -ne 1 ]]; then
    echo "Volume will be multiplied by a factor of $volumeMultiplier."
    params="$params -filter:a 'volume=$volumeMultiplier'"
else
    echo "Volume will be unaffected."
fi

if [[ $degradeToStereo -eq 1 ]]; then
    echo "Audio will be degraded to stereo."
    params="$params -ac 2"
elif [[ $degradeToStereo -eq 0 ]]; then
    echo "Audio will not be degraded to stereo."
fi

params="$params -c:s copy"

if [[ $subSource -eq 1 ]]; then
    echo "Subtitles source is external."
    echo "Subtitles language is $subLanguage."
    params="$params -metadata:s:s:0 title='' -metadata:s:s:0 language='$subLanguage'"
else
    echo "Subtitles source is internal."
fi

if [[ -f titles.txt ]]; then
    echo "A titles.txt file was found. Titles will be changed according to it."
    echo "Please check titles.txt to make sure the titles are correct."
    changeTitles=1
    counter=0
else
    echo "A titles.txt file was not found. Titles will not be changed."
    changeTitles=0
fi

read -p "Are these options correct? (y/n) " choice

case "$choice" in
    y|Y)
        echo "Initiating conversion sequence. This may take a while..."

        mkdir output
        currentParams=""

        shopt -s nullglob
        for i in *.mp4 *.mkv; do
            currentParams=$params
            fileNameNoExtension=$(echo $i | rev | cut -f 2- -d '.' | rev)

            if [[ $subSource -eq 1 ]]; then
                currentParams="-f srt -i $fileNameNoExtension.srt $currentParams"
            fi

            if [[ $changeTitles -eq 1 ]]; then
                ((counter++))
                currentParams="$currentParams -metadata title='$(awk "NR==$counter" titles.txt)'"
            fi

            ffmpeg -i "$i" $currentParams "output/$fileNameNoExtension.mkv"
        done

        echo "Conversion finished!"
    ;;
    n|N) echo "Operation canceled. Exiting.";;
    *) echo "Invalid input. Try again.";;
esac


  


  The directory I'm running this in contains six video files :

  


  

  1. E1 - The Pirates of Orion.mkv

  


  2. E2 - Bem.mkv

  


  3. E3 - The Practical Joker.mkv

  


  4. E4 - Albatross.mkv

  


  5. E5 - How Sharper Than a Serpent's Tooth.mkv

  


  6. E6 - The Counter-Clock Incident.mkv

  


  


  Here's the titles.txt file, for completion's sake :

  


  Star Trek: The Animated Series - Season 2, Episode 1 - The Pirates of Orion
Star Trek: The Animated Series - Season 2, Episode 2 - Bem
Star Trek: The Animated Series - Season 2, Episode 3 - The Practical Joker
Star Trek: The Animated Series - Season 2, Episode 4 - Albatross
Star Trek: The Animated Series - Season 2, Episode 5 - How Sharper Than a Serpent's Tooth
Star Trek: The Animated Series - Season 2, Episode 6 - The Counter-Clock Incident


  


  And finally, here's the error message given by FFmpeg on the terminal for every video file when running the command :

  


  Unable to find a suitable output format for 'Trek:'
Trek:: Invalid argument


  


  Maybe there are better ways to handle all of this, but first and foremost, I would like to figure out why the command fails with such a confusing error message. The only place where the string 'Trek :' is found is in the title taken from titles.txt, but I don't understand why that's seemingly being passed to the name of the output file instead of the title, and apparently only when running the script.

  


  Thanks a lot for your answers ! I know this is quite a bit of text, so I really appreciate you taking your time to read through this.

  


• Accidentally overwrote dylib files to usr/local/lib by copying lib from application bundle

  21 août 2019, par random_permutation

  I overwrote some of my dylib files in /usr/local/bin/ and now I’m having issues running a program. Is there a way of restoring these files back ?

  The program ffmpeg was running fine for me. Then I installed the program GPAC and did the following :

  $ sudo cp MP4Box /usr/local/bin/
  
  
  
  $ sudo cp -R /Applications/GPAC.app/Contents/MacOS/lib/* /usr/local/lib/

  I did this because it would allow me to run MP4Box from the command line since /usr/local/lib/ is in $PATH.

  But now when I try running

  $ ffmpeg

  I get this error :

  dyld : Library not loaded : /usr/local/opt/sdl2/lib/libSDL2-2.0.0.dylib
  Referenced from : /usr/local/bin/ffmpeg Reason : Incompatible library
  version : ffmpeg requires version 10.0.0 or later, but
  libSDL2-2.0.0.dylib provides version 5.0.0 Abort trap : 6

  I think what happened is : I overwrote some files into /usr/local/lib/ that I shouldn’t have done. In this case, I overwrote the version 10.0.0 libSDL2-2.0.0.dylib with version 5.0.0 from the GPAC app bundle.

  I have tried using homebrew to uninstall and reinstall ffmpeg, hoping that it would see that it would need to update my dylib libraries.

  $ brew uninstall ffmpeg
  
  
  
  $ brew install ffmpeg
  
  
  
  $ ffmpeg

  But this results in the same error.

  Here is the list of all the files I copied from /Applications/GPAC.app/Contents/MacOS/lib/* to /usr/local/lib/

  libSDL2-2.0.0.dylib libfreetype.6.dylib libplds4.dylib
  liba52.0.dylib libgpac.dylib libpng16.16.dylib
  libavcodec.58.dylib libjpeg.9.dylib libpostproc.55.dylib
  libavdevice.58.dylib liblzma.5.dylib libssl.1.0.0.dylib
  libavfilter.7.dylib libmad.0.dylib libswresample.3.dylib
  libavformat.58.dylib libmozjs185.1.0.dylib libswscale.5.dylib
  libavresample.4.dylib libmp3lame.0.dylib libtheora.0.dylib
  libavutil.56.dylib libnspr4.dylib libvorbis.0.dylib
  libcrypto.1.0.0.dylib libogg.0.dylib libx264.152.dylib
  libfaad.2.dylib libplc4.dylib

• FFMPEG : Application Error 0xc0000005

  9 septembre 2014, par oneofakind

  I have been running a script on ffmpeg and does fine in most of the PC that I deployed in. But, on few of them it keeps displaying an error 0xc0000005. I believe this is a Access Violation Error from the windows updates.

  I ran this command :

    fmpeg -r 4 -f dshow -an -i video="screen-capture-recorder" -video_size 2880x900 "C:\test.mp4"

  I tried to uninstall the windows update 2859537 but it does not exist. Is there any other way to fix this issue ? Please Help.

  Thank you.