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• Capture ffmpeg's metadata output in powershell

  17 mars 2016, par xdhmoore

  I’m trying to capture the output of ffmpeg in PowerShell(tm) to get some metadata on some ogg & mp3 files. But when I do :

  ffmpeg -i file.ogg 2>&1 | sls GENRE

  The output includes a bunch of lines without my matching string, "GENRE" :

        album_artist    : Post Human Era
  
        ARTIST          : Post Human Era
  
        COMMENT         : Visit http://posthumanera.bandcamp.com
  
        DATE            : 2013
  
        GENRE           : Music
  
        TITLE           : Supplies
  
        track           : 1
  
  At least one output file must be specified

  I am guessing something is different in the encoding. ffmpeg’s output is colored, so maybe there are color control characters in the output that are breaking things ? Or, maybe ffmpeg’s output isn’t playing nicely with powershell’s default UTF-16 ? I can’t figure out if there is another way to redirect stderr and remove the color characters or change the encoding of stderr.

  EDIT :
  Strangely, I also get indeterminate output. Sometimes the output is as shown above. Sometimes with precisely the same command the output is :

        GENRE           :

  

  Which makes slightly more sense, but is still missing the part of the line I care about (’Music’).

  Somewhere powershell is interpreting something as newlines that is not newlines.

• How to select compile parameter with custom need？

  19 février 2019, par Shucheng

  I need to compile a static FFmpeg on macOS and add this build to a Xcode project. If I download a full version from official website that is work. But this version size is huge, and I just need a few format to convert. So I need to compile by myself.

  I’ve tired to compile and it’s worked. But I am not sure how to select compile parameter.

  For instance, I need to convert : ogg,flac,opus,webm files to mp3 file with the minimum size. And my compile parameter :

    ./configure --enable-ffmpeg --enable-small  --enable-static --enable-protocol=file,http,https --enable-libvorbis \
  
    --enable-libopus --disable-ffplay --disable-ffprobe --enable-demuxer=mp3,mp4,webm_dash_manifest,opus,flac,ogg \
  
    --enable-decoder=mp3*,vp*,mpeg4*,opus,flac --enable-libmp3lame  --disable-autodetect --disable-network --enable-pthreads

  But it seems not to work, I can’t convert files. Error reason is dyld: Library not loaded: /usr/local/opt/lame/lib/libmp3lame.0.dylib.But I used parameter --enable-static.

  So what should I do ? If I need to support a format to convert, I need to care about which respect ? Thanks

• Capture ffmpeg's metadata output in powershell

  17 janvier 2021, par xdhmoore

  I'm trying to capture the output of ffmpeg in PowerShell(tm) to get some metadata on some ogg & mp3 files. But when I do :

  



  ffmpeg -i file.ogg 2>&1 | sls GENRE


  



  The output includes a bunch of lines without my matching string, "GENRE" :

  



        album_artist    : Post Human Era
      ARTIST          : Post Human Era
      COMMENT         : Visit http://posthumanera.bandcamp.com
      DATE            : 2013
      GENRE           : Music
      TITLE           : Supplies
      track           : 1
At least one output file must be specified


  



  I am guessing something is different in the encoding. ffmpeg's output is colored, so maybe there are color control characters in the output that are breaking things ? Or, maybe ffmpeg's output isn't playing nicely with powershell's default UTF-16 ? I can't figure out if there is another way to redirect stderr and remove the color characters or change the encoding of stderr.

  



  EDIT :
Strangely, I also get indeterminate output. Sometimes the output is as shown above. Sometimes with precisely the same command the output is :

  



        GENRE           :


  



  

  



  Which makes slightly more sense, but is still missing the part of the line I care about ('Music').

  



  Somewhere powershell is interpreting something as newlines that is not newlines.