Incompatible Video Codec?

I’m new to youtube-dl, and so far have had very few problems that the magnificent documentation couldn’t help with.

The problem: My download is completing error free. I’m not using’ best’ settings as it’s only a test. Video, and audio works for the first 10 seconds, then the video pixelates. I’m guessing it’s a codec problem, am I downloading the wrong format? VLC isn’t giving me an error.

One of the commands I ran: youtube-dl -f 161+148 -k https://www.youtube.com/watch?v=bYpzAPG8mOw