Question:
What's happening? Is there a workaround?

The video from a Blu-ray is:
Stream #0:0[0x1011]: Video: h264 (High) (HDMV / 0x564D4448), yuv420p(progressive), 1920x1080 [SAR 1:1 DAR 16:9], 23.98 fps, 23.98 tbr, 90k tbn

FFprobe's '-show_streams' (and other commands) shows this:
  pix_fmt=yuv420p
  level=41
  color_range=unknown     <<==
  color_space=unknown     <<==
  color_transfer=unknown  <<==
  color_primaries=unknown <<==
  chroma_location=left
  field_order=progressive

MPV player shows "bt.709".

When I transcode the AVC to HEVC, the colors don't look quite right. It's as though FFmpeg doesn't know it's BT-709.

Got any ideas?

--Mark.
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