On NVIDIA the NVDEC surface pool is the bulk of mpv's idle VRAM
footprint, and keep_open=yes plus the live GL render context pin
it for the widget lifetime. stop() now sets hwdec='no' to release
the pool while idle; play_file() re-arms hwdec='auto' before the
next loadfile so GPU decode is restored on playback.
behavior change from v0.2.6: video VRAM now releases when switching
from a video post to an image post in the same preview pane, instead
of staying pinned for the widget lifetime.
pax
860c8dcd50