Recherche avancée

Sur d’autres sites (5257)

• Revision 34501 : Premier jet de la categorie statistique

  16 janvier 2010, par eric@… — Log

  Premier jet de la categorie statistique

• FFMPEG FDKAAC and Python

  3 avril 2024, par Eric Barker

  Been banging my head against the wall for days on this. I'm writing a python program to take a 48kHz WAV file, convert it to 44.1kHz and encode it to HE-AAC via FDKAAC. FDK cannot convert to sample rates, so I'm using FFMPEG as the wrapper and piping it through FDKAAC. In a perfect world, I'd make a custom build of FFMPEG with FKD, but I've run into loads of issues on our Windows Server 2019 machine trying to build out FFMPEG, so I'm using vanilla FFMPEG with FDK piped in.

  


  I can get the command to work perfectly from a command prompt :

  


  ffmpeg -progress pipe:2 -i  -f wav -ar 44100 - | fdkaac -p 5 -b 64000 -o 


  


  But when I try to split it in Python for a Popen, it tries to evaluate the arguments and fails because ffmpeg doesn't have a "-p" argument :

  


  cmd = ['ffmpeg', '-progress', 'pipe:2', '-i', inFile, \
    '-f', 'wav', '-ar', '44100', '-', '|', \
    'fdkaac', '-p', '5', '-b', '64000', '-o', outFile]
fdkProcess = subprocess.Popen(cmd,
            stdout=subprocess.PIPE,
            universal_newlines=True)
for line in fdkProcess.stdout:
    print(line)


  


  RESULT :

  


  Unrecognized option 'p'.
Error splitting the argument list: Option not found


  


  I'll admit, I don't fully understand the pipeline process, and how to split commands via the "|" flag, and have them properly feed into stdout for the subprocess function to work correctly. I'm fairly new to python, and very new to programmatically capturing the output of a process like ffmpeg.

  


• Why does ffmpeg need DNS resolver as its dependencies ?

  20 décembre 2019, par Kshitij

  I was installing FFmpeg and libav today using brew install ffmpeg libav when I noticed unbound in the dependencies list.

  It’s very strange because unbound is DNS resolver and why ffmpeg would need it.

  ❯ brew install ffmpeg libav
  
  ==> Installing dependencies for ffmpeg: aom, frei0r, gmp, libtasn1, nettle, p11-kit, unbound, gnutls, lame, libass, libbluray, libsoxr, libvidstab, libvpx, opencore-amr, opus, libsndfile, libsamplerate, rubberband, sdl2, speex, giflib, leptonica, tesseract, theora, x264, x265 and xvid

  I even checked the info list for ffmpeg but unbound was not present there

  ❯ brew info ffmpeg
  
  ffmpeg: stable 4.2.1 (bottled), HEAD
  
  Play, record, convert, and stream audio and video
  
  https://ffmpeg.org/
  
  /usr/local/Cellar/ffmpeg/4.2.1_2 (287 files, 56.6MB)*
  
  - Poured from bottle on 2019-12-19 at 10:45:56
  
  From: https://github.com/Homebrew/homebrew-core/blob/master/Formula/ffmpeg.rb
  
  ==> Dependencies
  
  Build: nasm ✘, pkg-config ✔, texi2html ✘
  
  Required: aom ✔, fontconfig ✔, freetype ✔, frei0r ✔, gnutls ✔, lame ✔, libass ✔, libbluray ✔, libsoxr ✔, libvidstab ✔, libvorbis ✔, libvpx ✔, opencore-amr ✔, openjpeg ✔, opus ✔, rtmpdump ✔, rubberband ✔, sdl2 ✔, snappy ✔, speex ✔, tesseract ✔, theora ✔, x264 ✔, x265 ✔, xvid ✔, xz ✔
  
  ==> Options
  
  --HEAD
  
      Install HEAD version
  
  ==> Analytics
  
  install: 66,434 (30 days), 280,128 (90 days), 1,079,492 (365 days)
  
  install-on-request: 48,053 (30 days), 203,583 (90 days), 759,254 (365 days)
  
  build-error: 0 (30 days)

  Links for reference

  • https://formulae.brew.sh/formula/ffmpeg
  • https://formulae.brew.sh/formula/unbound