moviePy 添加字幕

Question

我正在尝试使用文档中推荐的方法为视频添加字幕

from moviepy.editor import *
from moviepy.video.tools.subtitles import SubtitlesClip
from moviepy.video.io.VideoFileClip import VideoFileClip


generator = lambda txt: TextClip(txt, font='Georgia-Regular', fontsize=24, color='white')
sub = SubtitlesClip("Output.srt", generator)
myvideo = VideoFileClip("video.mp4")

final = CompositeVideoClip([myvideo, sub])
final.write_videofile("final.mp4", fps=myvideo.fps,threads = 4)

这将需要 2 个多小时来处理，但是当删除字幕时（如下所示）它运行不到一分钟，如果我遗漏了什么或者这是正常的，请告诉我，谢谢！

from moviepy.editor import *
from moviepy.video.tools.subtitles import SubtitlesClip
from moviepy.video.io.VideoFileClip import VideoFileClip


myvideo = VideoFileClip("video.mp4")

final = CompositeVideoClip([myvideo])
final.write_videofile("final.mp4", fps=myvideo.fps,threads = 4)

Answer 1

问题是我的“Output.srt”文件有错误的时间戳，远远超过视频长度。

作为参考，任何使用 pytube 下载字幕的人，请将位于 captions.py 模块中的 pytube 源代码中的“xml_caption_to_srt”方法替换为以下内容

    def xml_caption_to_srt(self, xml_captions: str) -> str:
        """Convert xml caption tracks to "SubRip Subtitle (srt)".

        :param str xml_captions:
            XML formatted caption tracks.
        """
        segments = []
        root = ElementTree.fromstring(xml_captions)[1]
        i = 0
        for child in list(root):
            if child.tag == 'p':
                caption = ''
                if len(list(child)) == 0:
                    continue
                for s in list(child):
                    if s.tag == 's':
                        caption += ' ' + s.text
                caption = unescape(caption.replace("\n", " ").replace("  ", " "), )
                try:
                    duration = float(child.attrib["d"]) / 1000.0
                except KeyError:
                    duration = 0.0
                start = float(child.attrib["t"]) / 1000.0
                end = start + duration
                sequence_number = i + 1  # convert from 0-indexed to 1.
                line = "{seq}\n{start} --> {end}\n{text}\n".format(
                    seq=sequence_number,
                    start=self.float_to_srt_time_format(start),
                    end=self.float_to_srt_time_format(end),
                    text=caption,
                )
                segments.append(line)
                i += 1
        return "\n".join(segments).strip()

使用该方法，您可以提取具有正确时间戳的字幕，如下所示

from pytube import YouTube

yt_transcript = YouTube('video_link')

caption = yt_transcript.captions['a.en']

en_caption_convert_to_srt =(caption.generate_srt_captions())

#save the caption to a file named Output.txt
text_file = open("Output.srt", "w")
text_file.write(en_caption_convert_to_srt)
text_file.close()