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• How to create UI for Terminal [y/n] Prompts ?

  22 juin 2023, par itsRits

  I am working with FFmpeg and I want to create a responsive user interface for terminal prompts.

  


  Here's the main function.

  


  #converter.py

def convert_video(input_video, output_video=None, new_fps=None, new_container=None):

   if not output_video:
      if new_container is not None:
         output_video = "output." + new_container
      else:
         output_video = "output." + input_video.split('.')[-1]
   
   command = f"ffmpeg -i {input_video}"

   if new_fps:
      command += f' -r {new_fps}'

   command += f' {output_video}'

   subprocess.call(command, shell=True)


  


  On running the above code, if the video at the output destination with the same name already exists.
the terminal prompts :File 'output.mp4' already exists. Overwrite? [y/N].
I want to implement same using the message box in pyside2. I can create a message box in such a fashion

  


  #ui.py
    message_box = QMessageBox()
    message_box.setText("Do you want to proceed?")
    message_box.setStandardButtons(QMessageBox.Yes | QMessageBox.No)
    message_box.setDefaultButton(QMessageBox.No)


  


  But I am unable to figure how to make the message box pop once this prompt is found in terminal. Further how to send response back to it ?

  


• Pydub dir error . dynamic file path dosent play sound but with specific file path the code works fine

  20 avril 2021, par anshul raj

  hello developers idk whats wrong with this code it works fine when i give exact file path to the music file but if i pass it in dynamic way it doesnt work . actually my code is that user give a music file name it get downloaded then with the meta id it find the file in downloads dir then play it

  


   def songplayer(self,meta):
        def playmmusic(name):
            from pydub.playback import play
            from pydub import AudioSegment
            AudioSegment.converter = "C:\\ffmpeg\\bin\\ffmpeg.exe"
            AudioSegment.ffmpeg = "C:\\ffmpeg\\bin\\ffmpeg.exe"
            AudioSegment.ffprobe = "C:\\ffmpeg\\bin\\ffprobe.exe"
            sound = AudioSegment.from_file(name)
            play(sound)

        print(colored("Currently Playing : " + meta['title'],'yellow'))
        r=meta['id']
        tt='./downloads/'+r
        playmmusic(tt)


  


• CoreAudio : how to retrieve actual sampling rate of raw data ?

  13 août 2014, par jyavenard

  When attempting to play AAC-HE content in an mp4 container, the reported sampling rate found in the mp4 container appears to be half of the actual sampling rate.

  E.g it appears as 24kHz instead of 48kHz.

  Using the FFmpeg AAC decoder, retrieving the actual sampling rate can be done by simply decoding an audio packet using

  avcodec_decode_audio4

  And looking at AVCodecContext::sample_rate which will be updated appropriately. From that it’s easy to adapt the output.

  With CoreAudio decoder, I would use a AudioConverterRef set the input and output AudioStreamBasicDescription
  and call AudioConverterFillComplexBuffer

  As the converter performs all the required internal conversion including resampling it’s fine. But it plays the content after resampling it to 24kHz (as that’s what the input AudioStreamBasicDescription contains.

  Would there be a way to retrieve the actual sampling rate as found be the decoder (rather than the demuxer) in a similar fashion as one can with FFmpeg ?

  Would prefer to avoid losing audio quality if at all possible, and not downmix data

  Thanks