It may be a short clip or "piece" from a 2019 equestrian event or a stock footage snippet of a black horse, many of which were uploaded or tagged around that specific timeframe.
"Black Horse" (흑마) was a popular term used in Korean social circles and gaming communities (like World of Warcraft ) during mid-2019. 흑마_20190714.mp4
If you are looking for a or dialogue from this specific file, please clarify: It may be a short clip or "piece"
I can help further if you provide more context on where the file originated! which translates to "Black Horse."
The filename appears to be a corrupted encoding (mojibake) of the Korean phrase "흑마" (Heuk-ma), which translates to "Black Horse."