[KRdp] [Bug 507015] New: KRdp serves a grayish video stream (looks like a limited range video displayed as full range)

[Rongrong]

https://bugs.kde.org/show_bug.cgi?id=507015

            Bug ID: 507015
           Summary: KRdp serves a grayish video stream (looks like a
                    limited range video displayed as full range)
    Classification: Plasma
           Product: KRdp
      Version First unspecified
       Reported In:
          Platform: Other
                OS: Linux
            Status: REPORTED
          Severity: normal
          Priority: NOR
         Component: general
          Assignee: unassigned-bugs at kde.org
          Reporter: i at rong.moe
                CC: ahiemstra at heimr.nl
  Target Milestone: ---

Created attachment 183213
  --> https://bugs.kde.org/attachment.cgi?id=183213&action=edit
KRdp_KRDC

SUMMARY
KRdp serves a grayish video stream. It looks like something you get when
plugging a legacy HDMI monitor into a modern computer, i.e., a video stream
with a limited (16-235) quantization range displayed as full (0-255)
quantization range.

STEPS TO REPRODUCE
1. Set up krdpserver
2. Connect to it with KRDC or Remmina
3. See a grayish video stream

OBSERVED RESULT
The video stream is grayish. Meanwhile, Screen Capture (PipeWire) in OBS Studio
and Sunshine+Moonlight (H264 YUV422) all show correct colors. See attachments
for details.

EXPECTED RESULT
The video stream shouldn't be greyish and should show correct colors.

SOFTWARE/OS VERSIONS
Operating System: Debian GNU/Linux 13
KDE Plasma Version: 6.3.5
KDE Frameworks Version: 6.13.0
Qt Version: 6.8.2

ADDITIONAL INFORMATION
I've tried building KPipeWire+KRdp 6.4.2, and this issue is still reproducible.

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