vo_gpu-next: vapoursynth filter seems could not receive dolbyvision's metadata

[hooke007]

Important Information

Provide following Information:

• mpv version
  https://github.com/shinchiro/mpv-winbuild-cmake/releases/tag/20220723
• Windows Version
  win11 release
• Source of the mpv binary
  https://github.com/shinchiro/mpv-winbuild-cmake/releases/tag/20220723
• If known which version of mpv introduced the problem
  N/A
• Possible screenshot or video of visual glitches

Reproduction steps

# mpv.conf
vo=gpu-next

1. run mpv.exe and play a dv file, and then activate any vapoursynth filter.

2. vf toggle vapoursynth="~~/test0.vpy"

# test0.vpy
video_in.set_output()

Expected behavior

correct color

Actual behavior

Log file

mpv-test.log

[quietvoid]

The side data doesn't propagate through the vapoursynth vf.
Not sure if it would be easily doable, but from my perspective it isn't.

[chainikdn]

Not 100% sure about the patch cause there's strange color blinking sometimes (not always, just in some scenes) when the filter increases frame rate. Maybe I'm missing something important here o_O

[hooke007]

#10390 (comment)

when the filter increases frame rate

Probably there is the loss of luminace info in the extra frames created by vs.

[chainikdn]

it doesn't happen on every inserted frame
more like some frames occasionally lose this DoVi data

[Durden-T]

same for me