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• 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.

• How to record live video stream and seek by time stamp with ffmpeg ?

  14 août 2014, par Kart R.

  I’m trying to set up streaming server with archive playback functionality in it.

  Is it possible to record live streams with current timestamps (as metadata) and then seek stream by passing time stamp as start position ?

  According to ffserver docs (https://www.ffmpeg.org/ffserver.html) it should be easy configurable but there in no enough information in given docs. ("ffserver is a streaming server for both audio and video. It supports several live feeds, streaming from files and time shifting on live feeds. You can seek to positions in the past on each live feed, provided you specify a big enough feed storage.")

  The next question would be as fallows : is there any web server module that provides similar functionality as ffserver ? I know nginx-rtmp module but it lacks with many feature that ffserver provides.

  How can I achieve that request below gives stream starting at given time stamp :

  http://localhost:8080/test.mpeg?date=2014-07-26T23:05:00

  or

  http://localhost:8080/test.mpeg?ts=1408039332

  Any input would be appreciated since I have been stuck on this on for a while now.