The following Python script takes a directory of MIDI files and a directory of SF2 soundfont files and generates corresponding audio files (wav, aiff, mp3, etc.). The selection of which soundfont is used for each MIDI file is random. To use this script, you need to have FluidSynth installed. #!/usr/bin/env python. Yes. ffmpeg/avlib version: 3.4. It's easier to debug since you can log the actual ffmpeg calls and manually run them in a shell, and also search google for info about the ffmpeg flags, etc. It's easier to verify that you have the ffmpeg binary installed and test that it works than a dll/dylib/so.
Note that if you already have the mp3 file downloaded, the download will restart and overwrite the file. Run your Python script. The audio download for this interpretation of Beethoven's 4th Movement of the 9th Symphony should have a ~33 Mb MP3 file with the video's title available locally.
In the next two sections we’ll cover how to use two popular Python sound libraries to play and record audio data. First, we’ll take a look at how to record audio data with sounddevice and pyaudio. Before we get started with the code, we’ll have to install the prerequisite libraries. PyAudio is a wrapper around PortAudio. I use python and pyav to convert mp3 to wav. My code is below: ''' def mp3_to_wav(mp3_path, wav_path): inp = av.open(mp3_path, 'r') out = av.open(wav_path, 'w') ostream = out.add_stream("pcm_s16le") for frame in inp.decode(audio=0): frame.pts = None for p in ostream.encode(frame): out.mux(p) for p in ostream.encode(None): out.mux(p) out.close() }} 1. You need sample_size and channels to interpret raw_data as sound wave. Each frame is channels*sample_size bytes long. So if audio is mono (channel = 1) and sample_size = 2 bytes, you need to take first 2 bytes from raw_data, make 2-byte intereger out of it and you get the amplitude of the first frame. – Jacek.
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    • convert wav to mp3 python