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• Need steps to build ffmpeg library in ubuntu

  13 février 2014, par user1632209

  Can any one tell how to build .mk file and .so for ffMPEG library.

  I go through lots of blog and project but i don`t get complete steps for generating .mk and .so file.

  I have tried this and this,dont get satisfied result.

• Compression in Android taking long time

  24 avril 2017, par NSR

  I am new to Video related operations. I am using [FFMPEG][1] to compress a video in my Android application.

  I am trying to compress a video of 50MB to 10MB by executing following command

  ffmpeg -y -i /videos/in.mp4 -strict experimental -s 640x480 -r 25 -vcodec mpeg4 -b 150k -ab 48000 -ac 2 -ar 22050 /videos/out.mp4

  Video compressing successfully, but it taking more than 150 seconds. I am unable find out how to reduce that time.

  I want to change this command to complete this process in less time.

• installed ffmpeg not detected. Can't convert audio (python 2.7, mac os x)

  18 novembre 2017, par trezcast

  General information :

  I have a project in python that deals with audio classification ; the backend is complete but I’m suffering with the front-end. The backend requirement (that I can’t change) is that the audio file must be in wav format but I want users to be able to upload mp3 files as well. My front-end is a web server using python 2.7 and flask.

  So, I basically want to convert mp3 to wav, but keep on getting errors.
  (The complete code is at the bottom in case it is needed to understand the problem more clearly)

  My attempts :
  1- I used pydub library

  I installed homebrew, libav, and ffmpeg
  libav installation method : brew install libav —with-libvorbis —with-sdl —with-theora
  ffmpeg installation method : brew install ffmpeg —with-libvorbis —with-ffplay —with-theora

  Method1

  sound = AudioSegment.from_file(filename[i], format="mp3") #filename[i]=nameOfFile
  
  sound.export("input.wav", format="wav")

  Method2

  AudioSegment.from_file(filename[i], format="mp3").export("input.wav", format="wav")

  => Kept getting "file not found" and "cannot detect ffmpeg or avconv" runtime warning even though I installed ffmpeg and libav
  => Got same error above ("file not found") when I used "from_mp3" instead of "from_file"
  => Tried using "raw" instead of "mp3" and got "key error : sample_width" (couldn’t find what this error meant)
  Note : I made sure I’m in the right directory

  2- Used subprocess

  import subprocess
  
  subprocess.call(["ffmpeg", "-i",filename[i],"inputAudio.wav"])

  => Got "OSError : No such file or directory"

  I hope you can help me understand what the problem is and how to solve it...

  Complete Code :
  I have this at the top

  app = Flask(__name__)
  
  APP_ROOT = os.path.dirname(os.path.abspath(__file__))
  
  os.chdir(APP_ROOT)

  Inside the function that deals with the audio files

  data = request.files.getlist('file') #get all uploaded audio files
  
  fsize = len(data) #number of audio files
  
  i = 0 #index counter
  
  
  
  filename = ["" for x in range(fsize)] #LIST TO STORE EACH FILE'S NAME
  
  audiofile = ["" for x in range(fsize)] #LIST TO STORE CLASSIFICATION RESULTS OF EACH FILE
  
  
  
  
  
  #LOOP THROUGH EACH UPLOADED FILE
  
  for file in data:
  
      filename[i] = file.filename #ADD FILENAME TO LIST ABOVE
  
      destination = str(APP_ROOT)

  Problematic Part :

      if file.filename.endswith(".mp3"):
  
          from pydub import AudioSegment
  
          t = destination + "/" + filename[i]
  
          file.save(t) #SAVE UPLOADED MP3 FILE TO EXTRACT IT USING PYDUB
  
  
  
          sound = AudioSegment.from_file(filename[i], format="mp3")
  
          sound.export("input.wav", format="wav")
  
          os.remove(t) #DELETE MP3 FILE, WE ONLY WANT WAV
  
          destination +=  "/inputAudio.wav"

  Code Continuation :

  #STORE AUDIO FILE TO PREPARE FOR PROCESSING (CLASSIFICATION)
  
      else:
  
          destination +=  "/inputAudio.wav"
  
          file.save(destination)
  
  
  
  #FINAL STEP
  
      audiofile[i]=Raudio.start() #AUDIO PROCESSING (CLASSIFICATION)
  
      os.remove(destination) #DELETE AUDIO FILE TO PREVENT CLUTTERING OF FILES
  
      i += 1 #INCREMENT FILE INDEX