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• How to start live streaming on Mac using FFMPEG ?

  3 août 2014, par Alexandra Chis

  I am working on a MAC OS X Lion 10.7.5.

  How to properly install FFMPEG ?

  What I did :

  ruby -e "$(curl -fsSL https://raw.github.com/mxcl/homebrew/go)"
  
  brew install ffmpeg --with-fdk-aac --with-ffplay --with-freetype --with-frei0r --with-libass --with-libvo-aacenc --with-libvorbis --with-libvpx --with-opencore-amr --with-openjpeg --with-opus --with-rtmpdump --with-schroedinger --with-speex --with-theora --with-tools

  and even (I think this should work, but it doesn’t)

  brew install ffmpeg

  Nothing works...I can’t list the inputs, I can’t start the streaming from the USB camera, I can’t do anything.

  ffmpeg -f video4linux2 -s 320x240 -i video="USB cam":audio="USB mic" -f oss -acodec libvorbis -vcodec libvpx -f webm http://localhost:1234/streaming

  The errors I get look like this :

  unknown input format 'video4linux'

  and the same happens for alsa, openal, vfwcap etc.

  So did anyone try live streaming with FFMPEG from MAC ?
  How to install FFMPEG so that is supports video4linux2 or v4l2 or any input format at all ? How to list the devices (USB webcams or integrated webcams) ?

• lavu/channel_layout : change av_get_channel_layout() behavior at the next bump

  4 octobre 2013, par Stefano Sabatini

  lavu/channel_layout : change av_get_channel_layout() behavior at the next bump
  The new syntax is preferred since it allows backward syntax compatibility
  
  with libswr when switching to the new option handling code with
  
  AV_OPT_TYPE_CHANNEL_LAYOUT.
  With the new parser the string :
  
  1234
  is interpreted as a channel layout mask, rather than as a number of
  
  channels, and thus it’s compatible with the current way to set a channel
  
  layout as an integer (e.g. for the icl and ocl options) making use of
  
  integer option values.
  ff_get_channel_layout() with compat=0 will be used in the
  
  AV_OPT_TYPE_CHANNEL handler code.
  The user is encouraged to switch to the new forward compatible syntax,
  
  which requires to put a trailing "c" when specifying a layout as a number
  
  of channels.
  

  • [DH] libavutil/channel_layout.c
  • [DH] libavutil/channel_layout.h
  • [DH] libavutil/internal.h
  • [DH] libavutil/version.h

• How to send ctrl-c to stop ffmpeg

  30 juillet 2014, par Anna SAELEE

  I have written a small function like this :

  def test():
  
      command = "ffmpeg -f mpegts -i udp://224.6.207.111:1234?multicast=1 -acodec copy -vcodec copy -sameq ff-output.ts"
  
      os.system(command)
  
      self.myTimer = Timer(10, "myTimer")
  
      self.myTimer.start()
  
      os.system(signal.SIGINT)
  
      self.myTimer.stop()

  When i run test() in python in my terminal, ffmpeg always continues without closing.
  Does someone know how to stop it ?

  Thank you for all comment ;D
  I have find that we can use -t option for ffmpeg :)