Question about output messages

[larsk2]

2023-05-14 11:08:42 Lmulti fastflix-core[13508] INFO [29.4%] 66476 frames: 48.80 fps, 3521 kb/s, remain 0:54:39, GPU 2%, VE 98%, VD 15%, est out size 3964.9MB

As the video i encoding, you get these info messages every second or so.

I would just like to know what is VE and VD? And i see that the GPU (usage i presume) is only at 2%, even tho I'm using HW-encoding. If someone could shed some light on this it would be great.