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• ffmpeg fails to build by MacPorts

  11 mars 2015, par Rafa Firenze

  I’ve seen a many problems about this, but I didn’t get a solution.

  My OS is Yosemite and current OpenCV is 2.4.9

  I’m trying to install OpenCV with TBB, but when I do it by sudo port install opencv +debug +python27 +qt4 +tbb (through this SO question) :

  Rafaels-iMac:y3PQFyQhUG rafaelruizmunoz$ sudo port install opencv
  +debug +python27 +qt4 +tbb

  Warning : The Xcode Command Line Tools don’t appear to be installed ; most ports will likely fail to build.

  Warning : Install them by running ’xcode-select —install’.

  Warning : The Xcode Command Line Tools don’t appear to be installed ; most ports will likely fail to build.

  Warning : Install them by running xcode-select —install’.

  ---> Computing dependencies for ffmpeg

  ---> Configuring ffmpeg Error : Failed to configure ffmpeg, consult /opt/local/var/macports/build/_opt_local_var_macports_sources_rsync.macports.org_release_tarballs_ports_multimedia_ffmpeg/ffmpeg/work/ffmpeg-2.6/config.log

  Error : org.macports.configure for port ffmpeg returned : configure failure : command execution failed Please see the log file for port ffmpeg for details :

  /opt/local/var/macports/logs/_opt_local_var_macports_sources_rsync.macports.org_release_tarballs_ports_multimedia_ffmpeg/ffmpeg/main.log

  Error : Unable to upgrade port : 1

  Error : Unable to execute port : upgrade ffmpeg failed

  And there are not any logs on those paths.

  I’ve tried (support from SO and MacPorts).

  • port selfupdate
  • port upgrade ffmpeg
  • port clean x264
  • port upgrade outdated
  • port -f selfupdate

  but nothing happened.

  Does anyone have a clue ?

  Thank you in advance.

  ---

  EDIT : Doing xcode-select --install doesn’t resolve anything.

• ffmpeg - How to convert massive amounts of files in parallel ?

  15 juillet 2019, par Forivin

  I need to convert about 1.5TiB or audio files which are in either flac or wav format. They need to be converted into mp3 files, keeping important meta data and the cover art etc. and the bitrate needs to be 320k.

  This alone is easy :

  ffmpeg -i "$flacFile" -ab 320k -map_metadata 0 -id3v2_version 3 -vsync 2 "$mp3File" < /dev/null

  But the problem is making it faster. The command from above only uses 12.5% of the CPU. I’d much rather use like 80%. So I played around with the threads flag, but it doesn’t make it faster or slower :

  ffmpeg -i "$flacFile" -ab 320k -map_metadata 0 -id3v2_version 3 -vsync 2 -threads 4 "$mp3File" < /dev/null

  But it only utilizes my CPU by 13%. I think it only uses one thread. My CPU has 8 physical cores btw (+ hyperthreading).

  So my idea now is to somehow have multiple instances of ffmpeg running at the same time, but I have no clue how to do that properly.

  This is my current script to take all flac/wav files from one directory (recursively) and convert them to mp3 files in a new directory with the exact same structure :

  #!/bin/bash
  
  
  
  SOURCE_DIR="/home/fedora/audiodata_flac"
  
  TARGET_DIR="/home/fedora/audiodata_mp3"
  
  
  
  echo "FLAC/WAV files will be read from '$SOURCE_DIR' and MP3 files will be written to '$TARGET_DIR'!"
  
  read -p "Are you sure? (y/N)" -n 1 -r
  
  echo    # (optional) move to a new line
  
  if [[ $REPLY =~ ^[Yy]$ ]] ; then # Continue if user enters "y"
  
  
  
      # Find all flac/wav files in the given SOURCE_DIR and iterate over them:
  
      find "${SOURCE_DIR}" -type f \( -iname "*.flac" -or -iname "*.wav" \) -print0 | while IFS= read -r -d '' flacFile; do
  
          if [[ "$(basename "${flacFile}")" != ._* ]] ; then # Skip files starting with "._"
  
              tmpVar="${flacFile%.*}.mp3"
  
              mp3File="${tmpVar/$SOURCE_DIR/$TARGET_DIR}"
  
              mp3FilePath=$(dirname "${mp3File}")
  
              mkdir -p "${mp3FilePath}"
  
              if [ ! -f "$mp3File" ]; then # If the mp3 file doesn't exist already
  
                  echo "Input: $flacFile"
  
                  echo "Output: $mp3File"
  
                  ffmpeg -i "$flacFile" -ab 320k -map_metadata 0 -id3v2_version 3 -vsync 2 "$mp3File" < /dev/null
  
              fi
  
          fi
  
      done
  
  fi

  I mean I guess I could append an & to the ffmpeg command, but that would cause throusands of ffmpeg instances to run at the same time, which is too much.

• python3.6 ffmpeg call MacOSX

  8 avril 2017, par Awazleon

  I’m using Python 3.6 on MacOSX. I would like to use FFmpeg as Python sub-process. Everything works fine when using the OSX embedded Python 2.7 but using 3.6, this doesn’t work.
  I’ve got an error message because it doesn’t find FFmepg.

  raise FFExecutableNotFoundError("Executable ’0’ not found".format(self.executable))
  ffmpy.FFExecutableNotFoundError : Executable ’ffmpeg’ not found

  As you can se I tried with ffmpy but I also got the same result by invoking FFmpeg directly

  from subprocess import call
  call(["ffmpeg"])
  Traceback (most recent call last) :
  File "", line 1, in
  call(["ffmpeg"])
  File "/Library/Frameworks/Python.framework/Versions/3.6/lib/python3.6/subprocess.py", line 267, in call
  with Popen(*popenargs, **kwargs) as p :
  File "/Library/Frameworks/Python.framework/Versions/3.6/lib/python3.6/subprocess.py", line 707, in init
  restore_signals, start_new_session)
  File "/Library/Frameworks/Python.framework/Versions/3.6/lib/python3.6/subprocess.py", line 1326, in _execute_child
  raise child_exception_type(errno_num, err_msg)
  FileNotFoundError : [Errno 2] No such file or directory : ’ffmpeg’

  I installed the FFmpeg lib. by using Brew through Terminal. It was well installed but only visible by Python 2.7, not 3.6.

  Calling it from terminal is working :

  iMac-de-xxxxx : utilisateur$ ffmpeg

  ffmpeg version 3.2.4 Copyright (c) 2000-2017 the FFmpeg developers
  built with Apple LLVM version 8.0.0 (clang-800.0.42.1)
  configuration : —prefix=/usr/local/Cellar/ffmpeg/3.2.4 —enable-shared —enable-pthreads —enable-gpl —enable-version3 —enable-hardcoded-tables —enable-avresample —cc=clang —host-cflags= —host-ldflags= —enable-libmp3lame —enable-libx264 —enable-libxvid —enable-opencl —disable-lzma —enable-vda

  I’m not (yet) a Linux specialist but I think that a path is missing for 3.6 to find FFmpeg.
  Any clue to solve this annoying issue ?