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• Need explanation of details of ffmpeg and pipes command

  16 octobre 2013, par Donald A Nummer Jr

  Got the following from FFmpeg FAQ :

  mkfifo intermediate1.mpg
  
  mkfifo intermediate2.mpg
  
  ffmpeg -i input1.avi -sameq -y intermediate1.mpg < /dev/null &
  
  ffmpeg -i input2.avi -sameq -y intermediate2.mpg < /dev/null &
  
  cat intermediate1.mpg intermediate2.mpg |\
  
  ffmpeg -f mpeg -i - -sameq -vcodec mpeg4 -acodec libmp3lame output.avi

  Before i use or modify it I would like to understand it completely.

  What does the < /dev/null & do ?

  I understand | is pipe but why |\ ?

  What is the -f mpeg after ffmpeg (Seems, it tells ffmpeg to accept the piped in output from the cat(?) )

• ffmpeg install fail OSX 10.7.2

  3 mars 2012, par egermano

  Can you help me ?

  I try to install a ffmpeg using a brew, but i can't.

  It seems like the dependencies was successfully installed.

  I am using a Mac OSX 10.7.2 and the XCode 4.2.1.

  I couldn't install ffmpeg.

  I've tried :

  brew install ffmpeg
  
  brew install --use-clang ffmpeg
  
  brew install --use-clang --HEAD ffmpeg

  And they've all failed.

  This is the result log.

  $ brew install --use-clang ffmpeg
  
  ==> Downloading http://ffmpeg.org/releases/ffmpeg-0.9.1.tar.bz2
  
  File already downloaded in /Users/brunogermano/Library/Caches/Homebrew
  
  ==> ./configure --prefix=/usr/local/Cellar/ffmpeg/0.9.1 --enable-shared --enable-gpl --enable-version3 --enable-nonfree --enable-hardcoded-tables --enable-libfreetype --cc=/usr/bi
  
  ERROR: libmp3lame >= 3.98.3 not found
  
  
  
  If you think configure made a mistake, make sure you are using the latest
  
  version from Git.  If the latest version fails, report the problem to the
  
  ffmpeg-user@ffmpeg.org mailing list or IRC #ffmpeg on irc.freenode.net.
  
  Include the log file "config.log" produced by configure as this will help
  
  solving the problem.
  
  ==> Exit Status: 1
  
  http://github.com/mxcl/homebrew/blob/master/Library/Formula/ffmpeg.rb#L61
  
  ==> Environment
  
  HOMEBREW_VERSION: 0.8.1
  
  HEAD: 44213dfb4861c1307fdc4ae41e139404f0e1ffb1
  
  HOMEBREW_PREFIX: /usr/local
  
  HOMEBREW_CELLAR: /usr/local/Cellar
  
  Hardware: dual-core 64-bit penryn
  
  OS X: 10.7.2
  
  Kernel Architecture: x86_64
  
  Ruby: 1.8.7-249
  
  /usr/bin/ruby => /System/Library/Frameworks/Ruby.framework/Versions/1.8/usr/bin/ruby
  
  Xcode: 4.2.1
  
  GCC-4.0: N/A
  
  GCC-4.2: N/A
  
  LLVM: build 2336
  
  Clang: 3.0 build 211
  
  MacPorts or Fink? false
  
  X11 installed? true
  
  ==> Build Flags
  
  "--use-clang" was specified
  
  CC: /usr/bin/clang
  
  CXX: /usr/bin/clang++ => /usr/bin/clang
  
  LD: /usr/bin/clang
  
  CFLAGS: -O3 -w -pipe -march=native
  
  CXXFLAGS: -O3 -w -pipe -march=native
  
  CPPFLAGS: -I/usr/X11/include
  
  LDFLAGS: -L/usr/X11/lib
  
  MAKEFLAGS: -j2
  
  
  
  Error: Failed executing: ./configure --prefix=/usr/local/Cellar/ffmpeg/0.9.1 --enable-shared --enable-gpl --enable-version3 --enable-nonfree --enable-hardcoded-tables --enable-libfreetype --cc=/usr/bin/clang --enable-libx264 --enable-libfaac --enable-libmp3lame --enable-libtheora --enable-libvorbis --enable-libvpx --enable-libxvid --disable-ffplay
  
  These existing issues may help you:
  
      https://github.com/mxcl/homebrew/issues/8456
  
      https://github.com/mxcl/homebrew/issues/8815
  
      https://github.com/mxcl/homebrew/issues/9399
  
  Otherwise, please report the bug:
  
      https://github.com/mxcl/homebrew/wiki/checklist-before-filing-a-new-issue
  
  We saved the configure log, please gist it if you report the issue:
  
      ~/Library/Logs/Homebrew/config.log

  This is the brew doctor log :

  $ brew doctor
  
  Unbrewed dylibs were found in /usr/local/lib.
  
  
  
  If you didn't put them there on purpose they could cause problems when
  
  building Homebrew formulae, and may need to be deleted.
  
  
  
  Unexpected dylibs:
  
      /usr/local/lib/libavcodec.52.108.0.dylib
  
      /usr/local/lib/libavcore.0.16.1.dylib
  
      /usr/local/lib/libavdevice.52.2.3.dylib
  
      /usr/local/lib/libavfilter.1.74.0.dylib
  
      /usr/local/lib/libavformat.52.93.0.dylib
  
      /usr/local/lib/libavutil.50.36.0.dylib
  
      /usr/local/lib/libfaad.2.0.0.dylib
  
      /usr/local/lib/libguide.dylib
  
      /usr/local/lib/libmp3lame.0.0.0.dylib
  
      /usr/local/lib/libswscale.0.12.0.dylib
  
  
  
  Unbrewed static libraries were found in /usr/local/lib.
  
  
  
  If you didn't put them there on purpose they could cause problems when
  
  building Homebrew formulae, and may need to be deleted.
  
  
  
  Unexpected static libraries:
  
      /usr/local/lib/libavcodec.a
  
      /usr/local/lib/libavcore.a
  
      /usr/local/lib/libavdevice.a
  
      /usr/local/lib/libavfilter.a
  
      /usr/local/lib/libavformat.a
  
      /usr/local/lib/libavutil.a
  
      /usr/local/lib/libfaad.a
  
      /usr/local/lib/libmp4ff.a
  
      /usr/local/lib/libswscale.a
  
  
  
  Unbrewed .pc files were found in /usr/local/lib/pkgconfig.
  
  
  
  If you didn't put them there on purpose they could cause problems when
  
  building Homebrew formulae, and may need to be deleted.
  
  
  
  Unexpected .pc files:
  
      /usr/local/lib/pkgconfig/libavcodec.pc
  
      /usr/local/lib/pkgconfig/libavcore.pc
  
      /usr/local/lib/pkgconfig/libavdevice.pc
  
      /usr/local/lib/pkgconfig/libavfilter.pc
  
      /usr/local/lib/pkgconfig/libavformat.pc
  
      /usr/local/lib/pkgconfig/libavutil.pc
  
      /usr/local/lib/pkgconfig/libswscale.pc
  
  
  
  Unbrewed .la files were found in /usr/local/lib.
  
  
  
  If you didn't put them there on purpose they could cause problems when
  
  building Homebrew formulae, and may need to be deleted.
  
  
  
  Unexpected .la files:
  
      /usr/local/lib/libfaad.la
  
      /usr/local/lib/libmp3lame.la
  
  
  
  We couldn't detect gcc 4.2.x. Some formulae require this compiler.
  
  NOTE: Versions of XCode newer than 4.2 don't include gcc 4.2.x.
  
  
  
  ==> /usr/bin occurs before /usr/local/bin
  
  This means that system-provided programs will be used instead of those
  
  provided by Homebrew. This is an issue if you eg. brew installed Python.
  
  
  
  Consider editing your .bashrc to put:
  
    /usr/local/bin
  
  ahead of /usr/bin in your PATH.
  
  Some brews install binaries to sbin instead of bin, but Homebrew's
  
  sbin was not found in your path.
  
  
  
  Consider editing your .bashrc to add:
  
    /usr/local/sbin
  
  to the PATH variable.
  
  
  
  Some "config" scripts were found in your path, but not in system or Homebrew folders.
  
  
  
  `./configure` scripts often look for *-config scripts to determine if software packages
  
  are installed, and what additional flags to use when compiling and linking.
  
  
  
  Having additional scripts in your path can confuse software installed via Homebrew if
  
  the config script overrides a system or Homebrew provided script of the same name.
  
  
  
  /Library/Frameworks/Python.framework/Versions/Current/bin
  
      python-config python2.5-config

  Anyone can help me ?

• FFmpeg-kit : Unknown encoder 'libx264' / 'mediacodec' and Gradle dependency issues in Android Studio

  15 mai, par Izzet dönertaş

  I'm working on a video editor app in Android Studio using ffmpeg-kit. My goal is to export video segments with fade transitions and audio using FFmpeg.

  


  This implementation line works fine :

  


  implementation("com.arthenica:ffmpeg-kit-full:6.0-2")


  


  What doesn't work (Encoding) :
When I try to export a video segment using :

  


  -c:v libx264 -c:a aac


  


  I get this error in the logs :

  


  [vost#0:0 @ ...] Unknown encoder 'libx264'


  


  After checking the build configuration, it turns out libx264 is not enabled in the current FFmpeg-kit build :

  


  --disable-libx264 (or rather: --enable-libx264 is missing)


  


  Tried replacing libx264 with mediacodec :
Then I tried using :

  


  -c:v mediacodec -c:a aac


  


  But again I got :

  


  Unknown encoder 'mediacodec'


  


  Apparently, mediacodec is supported for decoding, but not as an encoder in FFmpeg-kit.

  


  Tried to compile my own FFmpeg binary :
I attempted building FFmpeg manually using the following flags :

  


  --enable-libx264 --enable-gpl --enable-shared ...


  


  My plan was to access it via JNI or ProcessBuilder.

  


  But the process is extremely frustrating :

  


  

  • Missing file errors

  


  • Configuration conflicts

  


  • Dependency hell (especially on macOS/Linux NDK toolchains)

  


  


  Tried other ffmpeg-kit variants :
I also tried switching to :

  


  implementation 'com.arthenica:ffmpeg-kit-full-gpl:6.0'


  


  and other variants like ffmpeg-kit-min-gpl, etc.
But in all of them I got the same Gradle error :

  


  Caused by: org.gradle.api.internal.artifacts.ivyservice.TypedResolveException:  Could not resolve all files for configuration ':app:debugRuntimeClasspath'.

  


  My build.gradle setup (yes, mavenCentral + google are already included) :

  


  pluginManagement {
    repositories {
        google()
        mavenCentral()
    }
}

dependencyResolutionManagement {
    repositoriesMode.set(RepositoriesMode.FAIL_ON_PROJECT_REPOS)
    repositories {
        google()
        mavenCentral()
    }
}



  


  I also tried enabling offline mode, clearing cache, adding jetpack.io, nothing helped.

  


  I asked ChatGPT-4o, Gemini 2.5 Pro. None could provide a working solution for this combination of :

  


  

  • Working implementation

  


  • Proper video encoding (with libx264 or mediacodec)

  


  • Without breaking Gradle dependency resolution

  


  


  I just want one of the following :

  


  


  1. A working FFmpeg-kit implementation (that supports libx264) and doesn’t crash Gradle

     


  


  2. A reliable guide or build.gradle snippet that lets me use GPL version (with libx264) without resolve errors

     


  


  3. (Ideally) A prebuilt safe LGPL-compatible alternative that allows encoding and is Google Play compliant

     


  


  


  Any help or suggestions would be highly appreciated.
Thanks in advance