color space bt709 to bt2020, but the player display color is different

[KaGaWu]

RT, I want to change the pix_fmt and colorspace of a video, from yuv420p, bt709 -> yuv420p10le, bt2020;
But it looks like a little weird, orange -> red.
I'm not a new ffmpeger, here is my command:

ffmpeg -hide_banner -y -i INPUT -map 0:v -c:v copy -pix_fmt yuv420p10le -colorspace bt2020nc -color_trc smpte2084 -color_primaries bt2020 OUTPUT

Can somebody tell me why?
thank you so much!

orange.mp4

test video 0
Format/String                    : MPEG-4
Format_Profile                   : Base Media
CodecID/String                   : isom (isom/av01/iso2/mp41)
FileSize/String                  : 3.73 KiB
Duration/String                  : 5s 0ms
OverallBitRate/String            : 6107 bps
Encoded_Application/String       : Lavf59.17.100

Video
ID/String                        : 1
Format/String                    : AV1
Format/Info                      : AOMedia Video 1
Format_Profile                   : Main@L3.1
CodecID                          : av01
Duration/String                  : 5s 0ms
BitRate/String                   : 3928 bps
Width/String                     : 1280 pixel
Height/String                    : 720 pixel
DisplayAspectRatio/String        : 16:9
FrameRate_Mode/String            : CFR
FrameRate/String                 : 25.000 fps
ColorSpace                       : YUV
ChromaSubsampling/String         : 4:2:0
BitDepth/String                  : 8 bit
ScanType/String                  : Progressive
Bits-(Pixel*Frame)               : 0.000
StreamSize/String                : 2.40 KiB (64%)
colour_range                     : Limited
colour_primaries                 : BT.709
transfer_characteristics         : BT.709
matrix_coefficients              : BT.709
CodecConfigurationBox            : av1C

https://files.videohelp.com/u/302682/orange.mp4

red.mp4

General
CompleteName                     : E:\local_workspace\go_test_slice\video\test_sapce\ts_3\red.mp4
Format/String                    : MPEG-4
Format_Profile                   : Base Media
CodecID/String                   : isom (isom/av01/iso2/mp41)
FileSize/String                  : 3.73 KiB
Duration/String                  : 5s 0ms
OverallBitRate/String            : 6106 bps
Encoded_Application/String       : Lavf59.17.100

Video
ID/String                        : 1
Format/String                    : AV1
Format/Info                      : AOMedia Video 1
Format_Profile                   : Main@L3.1
CodecID                          : av01
Duration/String                  : 5s 0ms
BitRate/String                   : 3926 bps
Width/String                     : 1280 pixel
Height/String                    : 720 pixel
DisplayAspectRatio/String        : 16:9
FrameRate_Mode/String            : CFR
FrameRate/String                 : 25.000 fps
ColorSpace                       : YUV
ChromaSubsampling/String         : 4:2:0
BitDepth/String                  : 10 bit
ScanType/String                  : Progressive
Bits-(Pixel*Frame)               : 0.000
StreamSize/String                : 2.40 KiB (64%)
colour_range                     : Limited
colour_primaries                 : BT.2020
transfer_characteristics         : PQ
matrix_coefficients              : BT.2020 non-constant
CodecConfigurationBox            : av1C

https://files.videohelp.com/u/302682/red.mp4

[Selur]

Can somebody tell me why?

You are just changing the flags on the video you are not doing any conversion there.
You would need to reencode and use additionally something like colormatrix https://www.ffmpeg.org/ffmpeg-all.html#colormatrix to convert something.

Side note: What reall buffels me is that the bit depth changed, '-c:v copy' should have prevented that,..

[ProWo]

[QUOTE=Selur;2658207]

Side note: What reall buffels me is that the bit depth changed, '-c:v copy' should have prevented that,..

-pix_fmt yuv420p10le

[Selur]

@ProWo: I know, but unless it only changed some flag it should not change the color space,...

[poisondeathray]

Or use zscale, to change matrix, transfer and primaries; with -c:v something other than copy

-vf zscale=min=709:m=2020_ncl:tin=709:t=smpte2084:pin=709:p=2020,format=yuv420p10le -c:v something

[KaGaWu]

Or use zscale, to change matrix, transfer and primaries; with -c:v something other than copy

-vf zscale=min=709:m=2020_ncl:tin=709:t=smpte2084:pin=709:p=2020,format=yuv420p10le -c:v something

thanks for reply, this make me notice the color matrix transform.