#8862: Wrong color space selected
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Reporter: airbete | Owner:
Type: defect | Status: reopened
Priority: normal | Component: ffplay
Version: git-master | Resolution:
Keywords: | Blocked By:
Blocking: | Reproduced by developer: 0
Analyzed by developer: 0 |
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Changes (by Balling):
* status: closed => reopened
* resolution: invalid =>
Comment:
Okay, so this is just a bug here.
https://github.com/FFmpeg/FFmpeg/blob/573f05a7533cd9aed3ed895b4fa4ad8fcba4e56a/fftools/ffplay.c#L968
See https://github.com/libsdl-org/SDL/issues/2860
So frame->colorspace == AVCOL_SPC_SMPTE170M (SMPTE 170M matrix) should
force that mode, but it does not.
Also why AVCOL_SPC_SMPTE240M matrix uses BT.601?? It is a different matrix
as derived from SMPTE 170M primaries (yeah, SMPTE 170M matrix is not
derived from SMPTE 170M primaries, I know, confusing).
P.S.
Obviously it is not primaries that define the matrix, even though it
should be (not the case for JPEG (BT.601 a.k.a. SMPTE 170M matrix is
derived from System M primaries ACTUALLY, see SMPTE 177 and
https://github.com/AOMediaCodec/libavif/pull/430#discussion_r610920396)
but BT.709 is the default in JPEG, since that is used in the default sRGB,
also not the case for DCI-P3 in BT.2020 matrix as Netflix uses).
I think we should try to fix that. Or at least deprecate ffplaying sYCC
files...
Since they migrated to github I will try to open an issue there too.
--
Ticket URL: <https://trac.ffmpeg.org/ticket/8862#comment:7>
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