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• Is it possible to use the ffmpeg that imageio automatically installs, and if so, how ?

  21 décembre 2016, par Gloin

  I am running macOS Sierra.

  The module moviepy has imageio as one of its dependencies, and the first time you run it, it installs ffmpeg, which it uses to read and write video files.
  I am now trying to use ffprobe without imageio, but still in python, however it cannot find it. It gives the error

  FileNotFoundError: [Errno 2] No such file or directory: 'ffmpeg'

  Running ffmpeg or ffprobe from the terminal gives the error

  -bash: ffprobe: command not found

  FFmpeg obviously is somewhere on my mac, as moviepy/imageio uses it, but only that can find it.

  This is the code I am trying to run :

  # function to find the resolution of the input video file
  
  def findVideoResolution(pathToInputVideo):
  
      cmd = "ffprobe -v quiet -print_format json -show_streams"
  
      args = shlex.split(cmd)
  
      args.append(pathToInputVideo)
  
      # run the ffprobe process, decode stdout into utf-8 & convert to JSON
  
      ffprobeOutput = subprocess.check_output(args).decode('utf-8')
  
      ffprobeOutput = json.loads(ffprobeOutput)
  
  
  
      # find height and width
  
      height = ffprobeOutput['streams'][0]['height']
  
      width = ffprobeOutput['streams'][0]['width']
  
  
  
      return height, width

  which cannot find ffprobe.

  Is there a way to use the installed version ffmpeg/ffprobe from python or the terminal, or do I have to install ffmpeg from ffmpeg.org ?

  EDIT : @LordNeckBeard
  In /Users/mynae/Library
  I have added the following to .bash_profile using this tutorial :

  PATH="/Users/myname/Library/Application Support/imageio/ffmpeg:${PATH}"
  
  export PATH

  /Users/myname/Library/Application Support/imageio/ contains a single folder called ffmpeg, which contains a single file called ffmpeg.osx. If I run ffmpeg.osx I get the message :

  Killed: 9

  I’ve never changed PATH before, and neither of these work. I still get the same errors as before. Have I done this correctly ? If so, is there anything else that might be wrong ?

• streaming webcam via rtp protocol

  18 août 2016, par vasu gupta

  i am trying to stream and receive my webcam feed on two terminal on same laptop.For this purpose I am using the following commands :-

  foo.sdp :

  SDP:
  
  v=0
  
  o=- 0 0 IN IP4 127.0.0.1
  
  s=No Name
  
  c=IN IP4 127.0.0.1
  
  t=0 0
  
  a=tool:libavformat 55.2.100
  
  m=video 1235 RTP/AVP 96
  
  a=rtpmap:96 H264/90000
  
  a=fmtp:96 packetization-mode=1

  Transmitting :

  ffmpeg -re -i /dev/video0 -r 24 -b 50k -s 858x500 -f mulaw -f rtp rtp://127.0.0.1:3000> foo.sdp

  Receiving :

  ffplay -i foo.sdp

  While transmission seems to be working fine , but when i am using receiving command I am getting en error :

  Protocol not on whitelist 'file,crypto'!/0   
  
  foo.sdp: Invalid data found when processing input

• PHP - Executing ffmpeg using exec() and shell_exec() does nothing

  27 avril 2012, par 8vius

  I'm trying to convert an audio file in PHP using ffmpeg, I get the audio file via post as a m4a and I want to turn it into mp3. I do the following to do this :

  $commandOutput = shell_exec('ffmpeg -i '.$filePath.' -ar 8000 -ab 16000 '.str_replace('m4a', 'mp3', $filePath));

  Yet it does nothing, and commandOutput also contains nothing. The file is saved properly but not converted to mp3, when I run the same command in terminal it converts the file properly. Any idea what might be happening ?