Update captions.py

[justSam13]

This PR fixes the error mentioned in #1085

[opterix]

Excellent!

This change in the captions.py file definitely solved the problem for me:
###########
Python 3.11.8
pytube 15.0.0

[justSam13]

Glad I could help!

[opterix]

There are still some issues with automatically generated captions.

For instance, this one works quite well:

from pytube import YouTube

video_url = 'https://www.youtube.com/watch?v=gRtjjtBHXxo'
yt = YouTube(video_url)
stream = yt.streams.first()
captions = yt.captions

caption = yt.captions['en']
print(caption.generate_srt_captions())

But this one, still has issues:

from pytube import YouTube

video_url = 'https://www.youtube.com/watch?v=gRtjjtBHXxo'
yt = YouTube(video_url)
stream = yt.streams.first()
captions = yt.captions

caption = yt.captions['a.en'] # Automatically generated transcript
print(caption.generate_srt_captions())

[justSam13]

The issue with auto generated captions is that their xml format is different from the others.

See for instance the auto generated captions have the xml as:

while the normal english captions have the xml:

The code in captions.py is written to parse the normal captions, so it is unable to do that for the auto generated ones :(
A new function needs to be written to parse those and an if condition to check that if it is an auto generated caption, use the new function else use the original one.

[justSam13]

Nvm two lines of code did the job!
Try it and update me :D

[opterix]

Great. It worked nicely

[justSam13]

Glad to know! 😁