notchlc: wrong colors with avi's variant of codec

[ami_stuff]

./ffmpeg -i notchlc_wrong_colors.avi -y out.avi
ffmpeg version N-112164-gcb26b85953 Copyright (c) 2000-2023 the FFmpeg developers
  built with gcc 11 (Ubuntu 11.4.0-1ubuntu1~22.04)
  configuration: 
  libavutil      58. 25.100 / 58. 25.100
  libavcodec     60. 27.100 / 60. 27.100
  libavformat    60. 13.100 / 60. 13.100
  libavdevice    60.  2.101 / 60.  2.101
  libavfilter     9. 11.100 /  9. 11.100
  libswscale      7.  3.100 /  7.  3.100
  libswresample   4. 11.100 /  4. 11.100
Input #0, avi, from 'notchlc_wrong_colors.avi':
  Metadata:
    software        : Lavf60.13.100
  Duration: 00:00:00.13, start: 0.000000, bitrate: 67473 kb/s
  Stream #0:0: Video: notchlc (nlc1 / 0x31636C6E), yuva444p12le(pc, gbr/bt709/iec61966-2-1), 640x480, 23.98 fps, 23.98 tbr, 23.98 tbn
Stream mapping:
  Stream #0:0 -> #0:0 (notchlc (native) -> mpeg4 (native))
Press [q] to stop, [?] for help
Output #0, avi, to 'out.avi':
  Metadata:
    software        : Lavf60.13.100
    ISFT            : Lavf60.13.100
  Stream #0:0: Video: mpeg4 (FMP4 / 0x34504D46), yuv420p(tv, unknown/bt709/iec61966-2-1, progressive), 640x480, q=2-31, 200 kb/s, 23.98 fps, 23.98 tbn
    Metadata:
      encoder         : Lavc60.27.100 mpeg4
    Side data:
      cpb: bitrate max/min/avg: 0/0/200000 buffer size: 0 vbv_delay: N/A
[out#0/avi @ 0x560686eaf0c0] video:64kB audio:0kB subtitle:0kB other streams:0kB global headers:0kB muxing overhead: 8.721071%
frame=    3 fps=0.0 q=2.0 Lsize=      70kB time=00:00:00.08 bitrate=6884.2kbits/s speed= 2.8x  

[Elon Musk]

and what colors are correct?

[ami_stuff]

attached the output from the reference codec

[Elon Musk]

And .mov works fine?

[ami_stuff]

Replying to Elon Musk:

And .mov works fine?

yes, attached

[Elon Musk]

Used same input file and same program for encoding and same decoder for input file when encoding?

[ami_stuff]

First I encoded raw yuv420p input video to "notchlc_wrong_colors.avi​" with virtualdub, later I decoded "notchlc_wrong_colors.avi​" file with virtualdub to "notchlc_wrong_colors_decoded.avi​".

[Elon Musk]

If you stream copy notchlc.mov to avi does it still decode with correct colors with reference windows app?

[ami_stuff]

Replying to Elon Musk:

If you stream copy notchlc.mov to avi does it still decode with correct colors with reference windows app?

the output avi from mov decodes with wrong colors, exactly the same wrong colors like "notchlc_wrong_colors.avi" decoded by ffmpeg

[Elon Musk]

as expected, this should not be the case here. Thus i consider notchlc encoding in avi broken from reference implementation, (to get better colors use -vf swapuv), because codec bitstream should be same in every container.