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"Your input can't be opened: VLC is unable to open the MRL 'file:///C:/Windows/System32/%22http%3A%2F%2F... " while opening file with arg :sub-file=http://...
VLC 3.0.12

Does http://... look like a file path to you? You probably need to use input-slave.

Does http://... look like a file path to you? You probably need to use input-slave.

The link looks like http:// ... DLRip.srt?link=3678f5f889a6db1fac6e0af9e1b440b7b0d00ea6&index=8&play
:input-slave= dont let me open local subtitles at all?

VLC for Linux has the same problem. This might be a general problem.

https://forum.videolan.org/viewtopic.php?t=138120
mederi's answer may help for you.
About input-slave, I have tested some other cases that work well.

1. subtitle from http 2. audio from http 3. subtitle from local 4. audio from local 5. two subtitles from http Other combinations are possible. Attention that use "#" split different inputs, and "#" must be included in quotation mark. You can always use quotation mark to avoid special characters cause some error.

"webm" was downloaded from youtube-dl, video and audio both end with "webm".
I tested the local files with "file:///home/audio.webm", "file/subtitle:///home/demo.ass" that not work, after reading https://superuser.com/questions/685507/ ... -same-time I know local files just use path. Hope these help for you and other searchers.

One part of problem has been fixed in https://code.videolan.org/videolan/vlc/-/issues/25549
Another one is https://code.videolan.org/videolan/vlc/-/issues/25645