Recherche avancée

Sur d’autres sites (7516)

• Audio issue : only blip heard when playing video clip in Openshot and Melt

  10 octobre 2014, par MatchPoint

  The issue is identical in openshot and melt. When a clip begins play, only a blip of the clip’s sound is heard and then silence. If I export the video in openshot, only the blip is heard in the exported video which means I can no longer create videos with openshot. :^(

  The issue started around the time when I needed to rotate a clip. I had download ffmpeg and some ffmpeg plugins to do this :

  sudo add-apt-repository ppa:jon-severinsson/ffmpeg
  
  sudo apt-get update
  
  sudo apt-get install ffmpeg
  
  sudo apt-get install frei0r-plugins

  I removed ffmpeg and frei0r-plugins and then reinstalled openshot but no luck. I feel my last option is to reinstall Ubuntu which I haven’t been forced to do in years.

  I’m sure this is a codec issue but I don’t know how to debug the issue. Some threads mention libslt as a possible issue if melt can’t play the audio in the clip. Anyone else have any suggestions ?

  Ubuntu 14.04
  Openshot 1.4.3
  melt 0.9.0

  Clip details - Container : Quicktime, Video codec h.264, audio codec mpeg-4 aac

  Also, the "Videos" app has no problem playing the audio in the clips.

  Thanks !

• How to use temporary files and replace the input when using ffmpeg in batch ?

  18 juin 2020, par Fabio Freitas

  What I did so far :

  



  I learned with this answer that I can use negative mapping to remove unwanted streams (extra audio, subtitles) from my video files.

  



  I them proceeded to apply it to a few dozen files in a folder using a simple for /r loop on Windows' cmd. Since I thought this process as some kind of trim, I didn't care about my original files and wanted ffmpeg to replace them, which of course it cannot.

  



  I tried to search a bit further and find ways to work around this issue without simply using a new destination an manually replacing files afterwards, but had no luck.

  



  However a lot of my findings seemed to indicate that ffmpeg has capabilities to use external temporary files for some of it's functions, even though I couldn't really find more onto it.

  



  What I want to do :

  



  So is there any way that I can make ffmpeg remove those extra streams and them replace the original file somehow. I'll also be needing to use this to multiple file, by I don't think this would be a big issue...

  



  I really need this to be done with ffmpeg, as learning the tool to it's full extent is a long-therm goal of mine and I want to keep working on that curve, but as for batch/cmd, I prefer it because I haven't properly learned a programming language yet (even if I often meddle with a few), but I would be happy to use suggestions of any kind for handling ffmpeg !

  



  Thank you !

  


• Can FFmpeg encode multiple files at once ?

  22 mai 2021, par ivan

  I'm working on a shell script to encode the audio files in a given directory and output .flac files to another directory. My proof of concept loops through each file one by one and runs it through ffmpeg. I suspect there's a way to pass the whole list of input files to ffmpeg in a single command, but haven't been able to figure it out.

  



  My current version looks like this :

  



  #!/bin/sh

encode_album() {
    local artist=$1; shift
    local album=$1; shift
    local in_dir="${HOME}/Music/raw-imports/${artist}/${album}"
    local out_dir="${HOME}/Music/library/${artist}/${album}"

    mkdir -p "${out_dir}"

    find "${in_dir}" -type f -name *.aiff | while IFS= read -r in_file; do
        local track_name=$(basename "${in_file}" .aiff)
        local out_file="${out_dir}/${track_name}.flac"

        encode_track "${in_file}" "${out_file}"
    done
}

encode_track() {
    local in_file=$1; shift
    local out_file=$1; shift

    null ffmpeg -i "${in_file}" -codec:a flac "${out_file}"
}

encode_album "Rolf Lislevand" "La Mascarade"


  



  This works, but do I need to feed these files into ffmpeg one by one, or is it capable of accepting a batch of files and processing them ?