sim3x

ffmpeg -i input_file_with_aac_audio.mp4 -c:a copy aac.aac

ffmpeg -i input_file_with_mp3_audio.mp4 -c:v copy -c:a libfdk_aac -b:a 128k mp4.mp4

class Topic(models.Model):
    title = models.CharField(max_length=200, verbose_name='Заголовок:')
    text = RichTextUploadingField(verbose_name='Текстовое поле:')
    created = models.DateField(verbose_name='Дата:')
    upload = models.FileField(upload_to='uploads/')