--convert-subs doesn't work when with --skip-download

[scil]

for example:

--write-sub --write-auto-sub --convert-subs srt --skip-download     
-o "%(title)s.%(ext)s"  
https://www.youtube.com/watch?v=Fnynf9Wy8IY

a vtt format sub file download, but it has not been converted to srt.
because YoutubeDL not run post_process , which requires --skip-download is False:

        if not self.params.get('skip_download', False):
                ...
                try:
                    self.post_process(filename, info_dict)

https://github.com/rg3/youtube-dl/blob/89923316210f8e17bb1a085278940e1c56fcff48/youtube_dl/YoutubeDL.py#L1818

Maybe some post processors that convert sub files can run even if there is no video downloaded.

[sivagao]

why close this issue?
do you have any plan to resolve this?

[lweo]

It's so inconvenient! why converting vtt to srt must require downloading the video first? I don't understand...