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• copy .wav audio file settings to new .wav file

  18 novembre 2020, par Jonas

  currently I am working with a speech to text translation model that takes a .wav file and turns the audible speech within the audio into a text transcript. The model worked before on .wav audio recordings that were recorded directly. However now I am trying to do the same with audio that was at first present within a video.

  


  The steps are as follows :

  


  

  • retrieve a video file from a stream url through ffmpeg

  


  • strip the .aac audio from the video

  


  • convert the .aac audio to .wav

  


  • save the .wav to s3 for later usage

  


  


  The ffmpeg command I use is listed below for reference :

  


    rm /tmp/jonas/*
  ffmpeg -i {stream_url} -c copy -bsf:a aac_adtstoasc /tmp/jonas/{filename}.aac
  ffmpeg -i /tmp/jonas/{filename}.aac /tmp/jonas/{filename}.wav
  aws s3 cp /tmp/jonas/{filename}.wav {s3_audio_save_location}


  


  The problem now is that my speech to text model does not work on this audio anymore. I use sox to convert the audio but sox does not seem to grab the audio. Also without sox the model does not work. This leads me to believe there is a difference in the .wav audio formatting and therefore I would like to know how I can either format the .wav with the same settings as a .wav that does work or find a way to compare the .wav audio formatting and set the new .wav to the correct format manually through ffmpeg

  


  I tried with PyPy exiftool and found the metadata of the two files :

  


  The metadata of the working .wav file is

  


  The metadata of the .wav file that does not work is

  


  So as can be seen the working .wav file has some different settings that I would like to mimic in the second .wav file presumably that would make my model work again :)

  


  with kind regards,
Jonas

  


• How can I save an animation from matplotlib as a mp4 video file ? [duplicate]

  19 décembre 2018, par Manza

  This question already has an answer here :

  • How can I overcome this key word error ?
    
    4 answers
    

  I’m trying to render a animation.ArtistAnimation object into a 24 fps video file in format mp4.

  I have search about and I reached this. However, even after compiling ffmpeg I get this error message :

  C:\Users\trite\OneDrive\Documentos\MusiTex\Python\venv\Scripts\python.exe 
  
  "C:/Users/trite/OneDrive/Documentos/MusiTex/Python/venv/Saving Animation.py"
  
  Traceback (most recent call last):
  
    File "C:\Users\trite\OneDrive\Documentos\MusiTex\Python\venv\lib\site- 
  
  packages\matplotlib\animation.py", line 161, in __getitem__
  
      return self.avail[name]
  
  KeyError: 'ffmpeg'
  
  
  
  During handling of the above exception, another exception occurred:
  
  
  
  Traceback (most recent call last):
  
    File "C:/Users/trite/OneDrive/Documentos/MusiTex/Python/venv/Saving 
  
  Animation.py", line 20, in <module>
  
      FFMpegWriter = manimation.writers['ffmpeg']
  
    File "C:\Users\trite\OneDrive\Documentos\MusiTex\Python\venv\lib\site- 
  
  packages\matplotlib\animation.py", line 164, in __getitem__
  
      'Requested MovieWriter ({}) not available'.format(name))
  
  RuntimeError: Requested MovieWriter (ffmpeg) not available
  
  
  
  Process finished with exit code 1
  
  </module>

  What is the problem with ?

  I would really appreciate if you can help me. Actually, if there is other ways to saving/render this kind of object into a video file (preferably mp4) I will be delighted to hear them.

  Thank you very much

• Using ffmpeg, extract small part of .m4a audio file and set extract file duration correctly

  30 août 2015, par Kes

  I have Linux mint 17.1.

  When I use ffmpeg to cut out a section of a 4 hour long .m4a audio file as follows :

  ffmpeg -ss 0:10:00 -i in_file.m4a -vn -c copy -t 0:40:00 out_file.m4a

  the correct position and duration of extract is extracted and the file plays just fine, but the audio duration meta-tag in the playback player is incorrectly shown as 4 hours.

  How can I set the actual extract duration so it is correct, in this case 30mins, or even better get ffmpeg to calculate it and set it properly ?

  Thank you