There is an incorrect color issue (reproduced in the above issues) where it is concentrated on the video converter.
Other than the video converter, color is consistent between the source (videotestsrc or ximagesrc so no issue here), the encoder (consistent color when the same video converter is used), and output (file and WebRTC video are also consistent color).
cudaconvert and videoconvert are similarly wrong for the colors, but show slightly different ways of being wrong.
Therefore, this is an upstream color converter issue that needs to be fixed in GStreamer.
If this is not fixed, users will have a noticeable feeling of degradation of the remote screen's color reproduction.
At least in flat, single-color, static regions, the reproduction should not deviate outside +/- 1 for each RGB color and converge to the exact color when some time passes in a static state. Thus, luma should be independent of chroma changes.
Relevant (more information about the issue): https://gitlab.freedesktop.org/gstreamer/gstreamer/-/merge_requests/6902 https://gitlab.freedesktop.org/gstreamer/gstreamer/-/issues/1260 https://gitlab.freedesktop.org/gstreamer/gstreamer/-/issues/1315 https://gitlab.freedesktop.org/gstreamer/gstreamer/-/issues/1339 https://gitlab.freedesktop.org/gstreamer/gstreamer/-/issues/2948 https://gitlab.freedesktop.org/gstreamer/gstreamer/-/issues/2991 https://gitlab.freedesktop.org/gstreamer/gstreamer/-/issues/3495 https://gitlab.freedesktop.org/gstreamer/gstreamer/-/issues/3556
There is an incorrect color issue (reproduced in the above issues) where it is concentrated on the video converter.
Other than the video converter, color is consistent between the source (videotestsrc or ximagesrc so no issue here), the encoder (consistent color when the same video converter is used), and output (file and WebRTC video are also consistent color).
cudaconvertandvideoconvertare similarly wrong for the colors, but show slightly different ways of being wrong.Therefore, this is an upstream color converter issue that needs to be fixed in GStreamer.
I think the direct cause is https://gitlab.freedesktop.org/gstreamer/gstreamer/-/issues/3495.
If this is not fixed, users will have a noticeable feeling of degradation of the remote screen's color reproduction.
At least in flat, single-color, static regions, the reproduction should not deviate outside +/- 1 for each RGB color and converge to the exact color when some time passes in a static state. Thus, luma should be independent of chroma changes.