video output: use sys instead of vout->p when available

10 jobs for master in 29 minutes and 57 seconds (queued for 3 seconds)
Status Job ID Name Coverage
  Build
passed #319822
zorin amd64 docker
android-arm

00:04:50

passed #319823
zorin amd64 docker
android-arm64

00:03:54

passed #319824
zorin amd64 docker
android-x86

00:04:01

passed #319825
zorin amd64 docker
android-x86_64

00:03:51

passed #319819
zorin amd64 docker
debian

00:04:57

passed #319821
macos
ios

00:05:55

passed #319820
macos
macos

00:09:33

passed #319816
zorin amd64 docker
win32

00:04:50

passed #319817
zorin amd64 docker
win64

00:07:10

passed #319818
zorin amd64 docker
win64-llvm

00:05:26