Comment by kevincox
2 years ago
I haven't see this other than for brief periods during quality switching (it seems to play out the current buffer in lower quality but new chunks are downloaded at the displayed target quality). However for some reason it does often just load at a very low (sub-720p) resolution and I need to manually up the quality or it will never get to the highest quality (I'm watching on a 4k monitor with great internet and hardware decoding, 4k has never stuttered for me).
I remember them starting to do automatic lower-quality streams when this came out[0], but I'm not sure if this is still the cause for the situation. It could be a general "we see this ISP/ASN failing more often with x many concurrent 4k streams, let's throw some people on 720p and see if it helps".
0: https://www.pcworld.com/article/398929/youtube-defaults-to-l...