Selur's Little Message Board

Sometime I work with video files who have that color setting

Color primaries: bt470m
Transfer: bt470m
Color matrix: bt470bg

Whats meaning? I change some value and see change also the color Huh

Think the original setting arent correct..what I need to change?

bt470bg are bt601 PAL and bt470m are NTSC?

Color Primaries and Transfer can be changed in the Encoder settings, if the encoder supports the signaling.
If the input is wrongly flagged or wrong detected/guessed "Filtering->Misc->Overwrite input->Overwrite input color matrix" allows to change the input value.
(but they these two are not really different, so I doubt the difference is noticeable)

Cu Selur

Dont know why i have file bt601 in primaries, transfer and matrix but hybrid dont recognize and put bt470bg and unknow Huh

You can read the debug output and see where Hybrid comes up with the value,...
I suspect, x264 doesn't support the values of your source and Hybrid tries to use something similar,..
this is what x264 supports:

Code:
--colorprim <string>    Specify color primaries ["undef"]

                                  - undef, bt709, bt470m, bt470bg, smpte170m,

                                    smpte240m, film, bt2020, smpte428,

                                    smpte431, smpte432

      --transfer <string>     Specify transfer characteristics ["undef"]

                                  - undef, bt709, bt470m, bt470bg, smpte170m,

                                    smpte240m, linear, log100, log316,

                                    iec61966-2-4, bt1361e, iec61966-2-1,

                                    bt2020-10, bt2020-12, smpte2084, smpte428,

                                    arib-std-b67

      --colormatrix <string>  Specify color matrix setting ["???"]

                                  - undef, bt709, fcc, bt470bg, smpte170m,

                                    smpte240m, GBR, YCgCo, bt2020nc, bt2020c,

                                    smpte2085, chroma-derived-nc,

                                    chroma-derived-c, ICtCp

see: x264 --fullhelp

Cu Selur

Ps.: alternatively share a sample with these characteristics and I can look at it over the weekend.

I use that code in ffmpeg for create che file
ffmpeg -i 01.asf -vf "scale=640:480:flags=lanczos,setsar=1" -map_metadata -1 -c:v libx264 -crf 18 -preset slow -color_primaries smpte170m -color_trc smpte170m -colorspace smpte170m -color_range tv -c:a aac -b:a 128k output.mkv

become matrix bt601, when i put in hybrid and save, matrix change in bt470bg Confused

Intervallo colore : Limited
Coefficienti matrici : BT.470 System B/G
matrix_coefficients_Original : BT.601

I will need a sample to reptoduce and look into it

Doom83

Selur

Doom83

Selur

Doom83

Selur