SMPlayer auto subtitles loading from certain directory

[learnerOfEnglish]

What should I do in order to force SMPlayer to load at once subtitles from certain directory? I download subtitles via youtube-dl in certain directory(in my case /tmp/subs), then I run SMPlayer with corresponding URL(actually I use mini script that gets URL, but its not the case), and I want SMPlayer to seek to that directory and load them(it would be great if it did it in order consistent with Preferences -> General -> Preferred language -> Subtitles. For example, if there is eng|ru, I would like to have eng subtitle on Primary Track and ru subtitle on Secondary Track)
Every time I run SMPlayer with URL, I have to do Subtitles->Load->[get to directory with subs and click required sub] twice and then once again choose(check) subtitle in Secondary Track option - it's very boring, especially when you want just to watch 5 min video

I was trying to handle it whole day, tried feed SMPlayer with more then one sub(via -sub key, though I read man and know that it takes filename only for one subtitles file ), tried to put keys --sub-paths=/tmp/subs --sub-auto=all|fuzzy at Preferences->Advanced->MPlayer/mpv Options, even tried to put there --ytdl --ytdl-raw-options=write-sub= --ytdl-raw-options=sub-lang=en - all without success.

[rvm]

If you use mpv as multimedia engine, adding something like --sub-paths=/tmp in preferences -> advanced -> mplayer/mpv -> options should work. You may also need to select the option "all subs in directory" in preferences -> subtitles -> autoload.
I've just tested it and it works.

[learnerOfEnglish]

[rvm]

Yes, it works for me with videos never watched before.

By the way, if you select "mpv + youtube-dl" in preferences -> network -> support for video sites, then the youtube subtitles are available in smplayer, no need to download them.

[learnerOfEnglish]

Great! It's what I was looking for

Downside:
It loads a bunch of subtitles that I don't need at all(for example, popular ted talks videos have about 30-60 subs).
Can I somehow pass to youtube-dl in "mpv + youtube-dl" the --sub-lang key?

[rvm]

It's possible to pass options to youtube-dl using the mpv option --ytdl-raw-options (https://mpv.io/manual/stable/#options-ytdl-raw-options)

However I wasn't able to use the option --sub-lang successfully with it.

[learnerOfEnglish]

Thank you for help:), I am quite satisfied with mpv+youtube-dl option(though it's not as fast as using bare mpv without youtube-dl and loads all subs).