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• Redirect FFMPEG's output to multiple named pipes on Windows

  27 août 2024, par tearvisus

  I am trying to stream video and audio data into two separate named pipes on Windows.

  



  ffmpeg.exe -f dshow -i video="My camera name":audio="My microphone name" -map 0:1 -ac 1 -f f32le \\.\pipe\audioStream -map 0:0 -f mjpeg \\.\pipe\videoStream


  



  The problem is that FFMPEG does not seem to understand that the outputs \\.\pipe\audioStream and \\.\pipe\videoStream are pipes and treats them like files.

  



  

  1. If the pipes are already created when the FFMPEG starts, it wants to overwrite them and fails.

  


  2. Otherwise, it complains that the path does not exist and fails.

  


  



  As far as I understand, specifying the pipe: protocol should do the trick, but I can't figure out how to use it properly, even with a single pipe. I have tried :

  



  

  1. pipe:pipeName

  


  2. pipe:pipe\pipeName

  


  3. pipe:\\.\pipe\pipeName

  


  4. pipe://pipeName

  


  5. pipe://pipe\pipeName

  


  6. pipe://\\.\pipe\pipeName

  


  



  I always end up with the same result : the output is written to the console and not to the pipe. If the pipe already exists when the FFMPEG starts, nothing connects to the pipe.

  



  Is it possible to use FFMPEG with named pipes on Windows ? If yes, what is the proper way to do this ?

  


• Prevent ffmpeg from collapsing multivalue metadata when converting formats

  30 août 2022, par brjaga

  When using ffmpeg to convert FLAC files to Opus, I'm finding that multivalue metadata fields are getting collapsed into single values.

  


  Here's the command I used :

  


  ffmpeg -i steely_dan-fm.flac steely_dan-fm.opus


  


  And here is one of the resulting tags when viewed with the mutagen library in Python :

  


  >>> flac_metadata['performer']
['Walter Becker (electric guitar, bass)', 'Jeff Porcaro (drums, percussion)', 'Donald Fagen (vocals, piano)', 'Victor Feldman (percussion)', 'Glenn Frey (backing vocals)', 'Don Henley (backing vocals)', 'Tim Schmit (backing vocals)']
>>> opus_metadata['performer']
['Walter Becker (electric guitar, bass);Jeff Porcaro (drums, percussion);Donald Fagen (piano);Victor Feldman (percussion);Donald Fagen (vocals);Glenn Frey (backing vocals);Don Henley (backing vocals);Tim Schmit (backing vocals)']


  


  Note that the former is a list of 9 strings, whereas the latter is a list of only one string.

  


  Relevant section of the Vorbis Comment specification :

  


  


  Field names are not required to be unique (occur once) within a comment header. As an example, assume a track was recorded by three well know [sic] artists ; the following is permissible, and encouraged :

  


  


            ARTIST=Dizzy Gillespie 
          ARTIST=Sonny Rollins 
          ARTIST=Sonny Stitt 


  


• Anomalie #2381 : Corriger le niveau d’intertitre

  9 juin 2018, par b b

  Il y a des H2 dans la dist, qui introduisent des listes d’articles, de résultats, ou des blocs (forum), je pense qu’ils peuvent rester comme ça.

  Si le bloc de forum sous le texte de l’article reste en h2, il va se retrouver "au même niveau" qu’un intertitre en h2 donc, c’est pas top non ?