Hi ALL!
I don't know if it can help.
An old project of mine uses footage by old NIKON D90 photocamera. This camera record video to 720p 16/9 yuvj422p, pc (jpeg), bt470bg (MJPG) in a AVI container.  I would like to point out that my Laptop monitor is calibrated to sRGB with an external Probe.

For the Edit in Cinelerra-GG the Settings/Preferences/Appearance was:
  Color:
  - YUV color space: BT709
  - YUV color range: JPEG (0-255)

and the Settings/Format was: 1280x720 (720p) HD @24fps 16/9 yuva420p
  - Color Model: YUVA-8bit

The Rendering by Cinelerra-GG were two, using MP4 and WEBM settings; I manually set some value for "color_primaries=bt709", "color_trc=bt709", "color_range=mpeg", "colorspace=bt709", "pixel_format=yuv420p".
Below the settings for the the two output:
=======================================================
Render_MP4:
  - Filename: ADifferentGold_HD_yuva8bit.mp4
  - File Format: FFMPEG - mp4
  - Audio:
      - Preset: h264.mp4
      - Bitrate: 128000 (128k)
      - Quality: -1
      - Samples: fltp
  - Video:
      - Compression: h264.mp4
      - Bitrate: 2000000 (2M)
      - Quality: -1
      - Pixels: yuv420p
      - Video Options ( * means changed by me):
          color_primaries=bt709 (*)
          color_range=mpeg (*)
          color_trc=bt709 (*)
          colorspace=bt709 (*)

=======================================================
Render_WEBM:
  - Filename: ADifferentGold_HD_yuva8bit.webm
  - File Format: FFMPEG - webm
  - Audio:
      - Preset: vorbis.webm
      - Bitrate: 128000 (128k)
      - Quality: -1
      - Samples: fltp
  - Video:
      - Compression: h264.mp4
      - Bitrate: 0
      - Quality: -1
      - Pixels: yuv420p
      - Video Options ( * means changed by me):
          # 20171119-2100
          # based on https://developers.google.com/media/vp9/settings/vod/
          # for explanations reference the Cinelerra Manual
          # 1280x720 (24, 25 or 30 frames per second)
          b=1024k
          minrate=512k
          maxrate=1485k
          tile-columns=2
          g=120 (*)
          threads=8
          quality=good
          crf=32
          speed=4
          color_primaries=bt709 (*)
          color_range=mpeg (*)
          color_trc=bt709 (*)
          colorspace=bt709 (*)
=======================================================
The ffprobe command says that renderings are: yuv420p, tv (mpeg; range=16-235), bt709.
The Title of the short video is "A Different Gold", and you can see it at http://www.visi1.org/Igor-sPortfolio_NLE.html

IgorBeg