mpv and playing two remote files?

(mpv -start 97 https://dl.dropboxusercontent.com/u/94597638/slitherProProb.mp4 -fs && killall mpv) & sleep 5 && mpv --ytdl-format=140 https://www.youtube.com/watch?v=YknlWO9Lqvc&list=RDYknlWO9Lqvc#t=9

Is there a way to make this a singular mpv command?

This

mpv -fs https://dl.dropboxusercontent.com/u/94597638/slitherProProb.mp4 --audio-file="$(youtube-dl -f 140 -g https://www.youtube.com/watch?v=YknlWO9Lqvc)"

will play both (youtube-dl used for resolving url), but -start command will start both track delayed. And

--audio-delay=<sec> 

is not working as expected.

Playing with fps to force video to be shorter and limiting the length

mpv -fps 100 --no-correct-pts --length 180 -fs https://dl.dropboxusercontent.com/u/94597638/slitherProProb.mp4 --audio-file="$(youtube-dl -f 140 -g https://www.youtube.com/watch?v=YknlWO9Lqvc)"
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