Can you see if you can replicate this. There's no current issue on my site that needs fixing because I've just avoided using a / character in the video description.... but just reporting to you in case it is an issue...
When posting a video, my user tried to include text like this...
"Warning everyone! This video shows images of people fit together while having fun! For your convenience, we offer these classes 3 times/week at our studio."
It seems the / resulted in the text being cut at that point. At first I thought it coincided with a maximum character limit, but I reposted the text using '3 times a week' instead of '3 times/week' and then there was no truncation.
Thanks for seeing if you can replicate! As I say, it's not currently an issue on my site.. nothing needs fixing there.