MoviePy is a Python-based video editing library that provides features to create, edit, merge, clip and convert videos. Here are the main roles of MoviePy:
- Video editing: MoviePy can edit video, separate video and audio streams, add and remove video and audio segments, and more.
- Video Merge: MoviePy can merge multiple video and audio files into one.
- Video transcoding: MoviePy can convert video formats and encoding methods, such as converting mp4 to avi or H.264 encoding to H.265 encoding.
- Video editing: MoviePy can add video effects, animations and subtitles, etc. to make videos more vivid and creative.
- Video Generation: Using MoviePy you can create customized videos, such as generating slideshows, animations and more.
- Video Processing: MoviePy can do some processing on videos, such as cropping, scaling, rotating and color adjustment.
In short, MoviePy provides Python developers with an easy-to-use framework to work with videos without having to learn complex video editing software. It's powerful enough to make video processing, editing and generation easy.
This article describes how to use moviepy toSplit audio streams and reduce bit rate。
1. Preparation
Before you start, you need to make sure that Python and pip have been successfully installed on your computer, if not, visit this article:Super Detailed Python Installation Guide Perform the installation.
(Option 1)If your goal with Python is data analysis, you can just install theAnacondaIt has built-in Python and pip.
(Option 2)In addition, it is recommended to useVSCode EditorIt has many advantages
Please choose one of the following ways to enter commands to install dependencies：
1. Windows environment Open Cmd (Start-Run-CMD).
2. MacOS environment Open Terminal (command+space to enter Terminal).
3. If you are using a VSCode editor or Pycharm, you can use Terminal directly from the bottom of the interface.
pip install moviepy
Split Audio
To use MoviePy library to cut the uploaded mp3/wav at every 30 seconds and reduce the file bitrate, we can follow the steps below.
1. Import the MoviePy library and other libraries required:
import os from import *
2. Define a function to cut the audio file and reduce the bit rate:
def split_audio_file(filename, split_duration=30, bitrate=16000):
# Reading audio files
audio = AudioFileClip(filename)
# Calculate total file length and cut points
total_duration =
split_points = list(range(0, int(total_duration), split_duration))
split_points.append(int(total_duration))
filelist = []
# Cut audio files and reduce bitrate
for i in range(len(split_points) - 1):
start_time = split_points[i]
end_time = split_points[i+1]
split_audio = (start_time, end_time)
split_audio.write_audiofile(f"{(filename)[0]}_{i}.wav", fps=bitrate)
(f"{(filename)[0]}_{i}.wav")
()
return filelistThe function accepts three parameters: filename indicates the name of the audio file to be processed, split_duration indicates how long the file is to be cut according to (in seconds), and bitrate indicates the output bitrate to be set (in bits).
In the function, we first read the audio file and then calculate the cut points. Then, we iterate through each cut point with a loop, cut the audio file into smaller files and reduce the bitrate, and finally output it as a new audio file.
3. Call the function to process the audio file:
filename = "your_audio_file.mp3" # Name of the audio file to be processed split_duration = 30 # Cut files every 30 seconds bitrate = "64k" # Set the output bit rate to 64kbps split_audio_file(filename, split_duration, bitrate)
When calling the function, just pass the name of the audio file to be processed, the length of the cut file and the output bitrate as parameters. The function will output the processed audio file to the current directory.
3.Mp3 output bitrate
Please note that you cannot adjust the output bitrate too low. the output bitrate of an MP3 file affects the quality of the audio and the file size. The higher the bitrate, the better the audio quality, but the larger the file size. On the contrary, the lower the output bitrate, the lower the audio quality but the smaller the file size.
The bitrate of an MP3 file is the number of bits per second required (i.e., the bit rate). When encoding, the MP3 algorithm determines the amount of audio data to compress based on the set bitrate, which affects the size and quality of the output file. Typically, a higher bitrate produces higher audio quality, but also takes up more storage space and bandwidth.
If the output bitrate is set too low, this can result in a noticeable loss of audio quality, and problems such as audio noise, distortion, and low-frequency truncation may occur. If the output bitrate is set too high, the file size can become very large and may make transmission and storage difficult.
Therefore, when choosing an output bit rate, audio quality and file size requirements need to be weighed against transmission and storage constraints on a case-by-case basis. In general, 128 kbps is a commonly used MP3 output bit rate that produces better audio quality and appropriate file sizes.
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