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• How do I blur a segment in a video using ffmpeg ?

  11 septembre 2013, par PeppyHeppy

  I am looking through the docs for ffmpeg and am having a hard time finding my way around.

  Is there a way to add blurring to a video for a specific range in the video.

  Example : a 1 minute video. I want to blur seconds 30-35.

  Is this possible and if so what does the command look like ?

• libFLAC : CPUID detecion improvements.

  28 juin 2014, par Erik de Castro Lopo

  libFLAC : CPUID detecion improvements.
  According to docs, it’s incorrect to just call CPUID with EAX=1.
  
  One must to ensure that this value is supported.
  CPUs that don’t support CPUID level 1 are very old, but...
  
  if FLAC tests CPUID presence it should also test CPUID level support.
  Also the function FLAC__cpu_have_cpuid_asm_ia32 was simplified
  
  according to the docs at Intel website and in Wikipedia.
  Patch-from : lvqcl <lvqcl.mail@gmail.com>
  

  • [DH] src/libFLAC/cpu.c
  • [DH] src/libFLAC/ia32/cpu_asm.nasm

• nw.js node WebKit - unable to play audio file

  9 novembre 2018, par Allasso

  I have started working with nw.js, creating a test app to play audio files from. I am working on OS X 10.11.

  The code for the player is :

  <audio controls="controls">
  
    <source src="path/to/file/song.mp3" type="audio/mp3">
  
  </source></audio>

  The player and controls appear, but the file will not play. I have tried using a relative path, and an absolute path, trying both
  "/path/to/file/song.mp3"
  and
  "file :///path/to/file/song.mp3"
  schemes.

  I have verified the path is valid in all cases.

  This page :

  http://docs.nwjs.io/en/latest/For%20Developers/Enable%20Proprietary%20Codecs/

  tells me that mp3 should be supported (for v0.22.1+, though I haven’t found a way to tell the version of my mp3, though is was made recently so I assume is the the latest codec.)

  Just to try more stuff, I followed the instructions on these pages :

  http://docs.nwjs.io/en/latest/For%20Developers/Enable%20Proprietary%20Codecs/
  (It appears mp3 gained support since this doc came out.)

  https://github.com/nwjs/nw.js/wiki/Using-MP3-%26-MP4-%28H.264%29-using-the—video—%26—audio—tags.

  I downloaded the ffmpeg libs from here :

  https://github.com/iteufel/nwjs-ffmpeg-prebuilt/releases

  and placed copies here :

  find . -name libffmpeg.dylib
  
  ./dist/nw.js-examples/osx64/nw.js-examples.app/Contents/Versions/67.0.3396.87/libffmpeg.dylib
  
  ./node_modules/nw/nwjs/nwjs.app/Contents/Versions/54.0.2840.99/nwjs Framework.framework/libffmpeg.dylib
  
  ./node_modules/nw-builder/cache/0.31.2-sdk/osx64/nwjs.app/Contents/Versions/67.0.3396.87/libffmpeg.dylib
  
  cp ~/Downloads/libffmpeg.dylib ./dist/nw.js-examples/osx64/nw.js-examples.app/Contents/Versions/67.0.3396.87/libffmpeg.dylib
  
  cp ~/Downloads/libffmpeg.dylib "./node_modules/nw/nwjs/nwjs.app/Contents/Versions/54.0.2840.99/nwjs Framework.framework/libffmpeg.dylib"
  
  cp ~/Downloads/libffmpeg.dylib "./node_modules/nw-builder/cache/0.31.2-sdk/osx64/nwjs.app/Contents/Versions/67.0.3396.87/libffmpeg.dylib"

  Still to no avail running either

  npm run dev

  or

  npm run prod

  and opening the packaged app.

  I can play the file fine with the same code from a web browser.

  I don’t know what else to try, help would be much appreciated, thanks.