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This article introduces the relevant knowledge of "how to extract audio from video by Python". In the operation of actual cases, many people will encounter such a dilemma, so let the editor lead you to learn how to deal with these situations. I hope you can read it carefully and be able to achieve something!

First, extract audio

Need to use python's moviepy library

Github address of moviepy: https://github.com/Zulko/moviepy

Just install moviepy on the command line pip!

Pip install moviepy-I http://pypi.douban.com/simple-- trusted-host pypi.douban.com

Extract audio: suppose there is a mp4 file path of "D:pythonpycharm2020my_programvideo_process est_01.mp4", and we want to extract the audio from it and save it to "D:pythonpycharm2020my_programvideo_processvst01.mp3". The three lines of Python code are implemented as follows:

Import moviepy.editor as mpy# intercepts background music audio_background = mpy.AudioFileClip (r'D:pythonpycharm2020my_programvideo_process est_01.mp4'). Subclip (1,60) audio_background.write_audiofile

Execute the above three lines of code, you will find that the audio file has been successfully extracted to the specified folder ~ ~ the video format and audio format here support other formats, such as reading mp4 format video, extracting the background music and saving it as MP3 format audio.

Second, gravitational wave drawing

Data sources:

Http://python123.io/dv/grawave.html

Http://python123.io/dv/H1_Strain.wav

Http://python123.io/dv/L1_Strain.wav

Http://python123.io/dv/wf_template.txt

Read time-related data from the configuration document

Import numpy as np # numpy library for scientific computing import matplotlib.pyplot as plt # library for drawing matplotlibfrom scipy.io import wavfile # library for reading waveform files rate_h, hstrain = wavfile.read (r "H1_Strain.wav", "rb") # read audio file rate_l, lstrain = wavfile.read (r "L1_Strain.wav", "rb") # reftime Ref_H1 = np.genfromtxt ('GW150914_4_NR_waveform_template.txt'). Transpose () reftime, ref_H1 = np.genfromtxt (' wf_template.txt'). Transpose () # download the txt file using python123.io

Tectonic strain data

Htime_interval = 1 / rate_hltime_interval = 1 / rate_lfig = plt.figure (figsize= (12, 6)) # create a drawing space of 12'6 # loss signal starting point htime_len = hstrain.shape [0] / rate_h # read the length of the first dimension of the data, get the total length of the function on the axis htime = np.arange (- htime_len / 2, htime_len / 2, htime_interval) # (starting point, end point Time interval)

Mapping using data from the "H1" detector

Plth = fig.add_subplot (221) # set drawing area plth.plot (htime, hstrain,'r') # draw an image with time as x axis and strain data as y axis.'y'is yellow plth.set_xlabel ('Time (seconds)') plth.set_ylabel ('H1 Strain') plth.set_title ('H1 Strain')

Draw L1 Strain and Template

Ltime_len = lstrain.shape [0] / rate_lltime = np.arange (- ltime_len / 2, ltime_len / 2, ltime_interval) pltl = fig.add_subplot (222) pltl.plot (ltime, lstrain,'k') pltl.set_xlabel ('Time (seconds)') pltl.set_ylabel ('L1 Strain') pltl.set_title ('L1 Strain') pltref = fig.add_subplot (reftime, ref_H1) 'purple') pltref.set_xlabel (' Time (seconds)') pltref.set_ylabel ('Template Strain') pltref.set_title (' Template') fig.tight_layout () # automatically adjust the outer edge of the image

Save and display the image

Plt.savefig ("Gravitational_Waves_Original.png") # saves the image in png format plt.show () plt.close (fig) "how to extract audio from video by Python". Thank you for your reading. If you want to know more about the industry, you can follow the website, the editor will output more high-quality practical articles for you!

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