KeyError：“video_fps”与 moviepy ffmpeg

Question

我正在编写一个 Python 脚本，用于将 Django 服务器上的视频 (.MP4) 转换为音频文件 (.MP3)。为了实现这一目标，我使用 Moviepy 库，但是当我运行脚本时，出现以下错误：

Internal Server Error: /test/
Traceback (most recent call last):
  File "C:\Users\etsho\AppData\Local\Programs\Python\Python38\lib\site-packages\django\core\handlers\exception.py", line 34, in inner
    response = get_response(request)
  File "C:\Users\etsho\AppData\Local\Programs\Python\Python38\lib\site-packages\django\core\handlers\base.py", line 126, in _get_response
    response = self.process_exception_by_middleware(e, request)
  File "C:\Users\etsho\AppData\Local\Programs\Python\Python38\lib\site-packages\django\core\handlers\base.py", line 124, in _get_response
    response = wrapped_callback(request, *callback_args, **callback_kwargs)
  File "C:\Users\etsho\AppData\Local\Programs\Python\Python38\lib\site-packages\django\views\decorators\csrf.py", line 54, in wrapped_view
    return view_func(*args, **kwargs)
  File "C:\shoe\musicsite\main\views.py", line 29, in test
    video = VideoFileClip(os.path.join(basePath + ".mp4"))
  File "C:\Users\etsho\AppData\Local\Programs\Python\Python38\lib\site-packages\moviepy\video\io\VideoFileClip.py", line 88, in __init__
    self.reader = FFMPEG_VideoReader(filename, pix_fmt=pix_fmt,
  File "C:\Users\etsho\AppData\Local\Programs\Python\Python38\lib\site-packages\moviepy\video\io\ffmpeg_reader.py", line 34, in __init__
    self.fps = infos['video_fps']
KeyError: 'video_fps'
[15/Nov/2019 23:49:43] "POST /test/ HTTP/1.1" 500 80909

我几乎找不到有关此错误或如何解决该错误的信息，因此我们将不胜感激任何帮助或见解。

这是我的 Python 脚本 (views.py)：

import pyodbc, json, pytube
from django.http import HttpResponse
from django.views.decorators.csrf import csrf_exempt
from rest_framework import parsers
import os
from moviepy.editor import *

@csrf_exempt
def test(request):
if request.method == 'POST':
    filePath = 'C:\\Users\\etsho\\Music\\'

    #retrieve url from app
    body_unicode = request.body.decode('utf-8')
    body = json.loads(body_unicode)
    videoURL = body['url']

    print("before download")

    #download youtube video
    youtube = pytube.YouTube(videoURL)
    videoTitle = youtube.title
    video = youtube.streams.filter(only_audio=True).first()
    freshDownload = video.download(filePath)

    print("after download")

    basePath, extension = os.path.splitext(freshDownload)
    video = VideoFileClip(os.path.join(basePath + ".mp4"))
    video.audio.write_audiofile(os.path.join(basePath + ".mp3"))

    print("video converted")



return HttpResponse("")

Answer 1

所以@furas 说到点子上了。最终成为问题的是only_audio=True线路的一部分。视频仍然下载，文件仍然是 .MP4，但视频没有图片（按照only_audio），但对我来说，它只是一个黑色视频。实际发生的情况是视频中没有实际的帧，因此video_fps是错误名称。删除only_audio=True输入后，将下载一个正常的视频，然后按应有的方式进行转换。