在保存django之前,如何将文件转换为MP3?

好吧,所以我自己解决了。我不知道这是正确的方法还是安全的方法,但它是有效的。任何提示/建议或更好的解决方案都是很好的。谢谢您!

from django.db import models
from django.core.exceptions import ValidationError
from moviepy.editor import *

def update_filename(instance, filename):
    return filename[0:-4] + ".mp3"

def process_file(file):
    file_audio = VideoFileClip(file.temporary_file_path()).audio
    new_file_path = file.temporary_file_path()[:-4] + ".mp3"
    file_audio.write_audiofile(new_file_path)
    file.file.name = new_file_path

class Sermon(models.Model):
    date = models.DateField()
    audio = models.FileField(upload_to=update_filename)

    def clean(self):
        super().clean()
        extension = self.audio.name[len(self.audio.name) - 4:]
        file = self.audio.file
        file.__class__
        if extension != ".mp3" and extension != ".mp4":
            raise ValidationError("Warning Warning Warning")
        elif extension == ".mp4":
            process_file(file)