AVFoundation recording has inaccurate RGB values

[LordHDL]

Summary: Recording the desktop with AVFoundation in RGB pixel format changes the color values of the output video.
How to reproduce: Use rawvideo or any lossless codec that supports RGB formats, and use -pixel_format 0rgb or bgr0 for -f avfoundation.

ffmpeg -f avfoundation -framerate 60 -pixel_format 0rgb -i "3:3" -c:v rawvideo -c:a copy -t 5 /Volumes/Samsung_X5/rawvideo.nut

[Carl Eugen Hoyos]

Is the issue also reproducible with builds from June 2019 or is this a regression?

[LordHDL]

Earliest build I could find was January 2, 2019 and the issue was present then as well. Tested one from June as well, same thing.

[Thilo Borgmann]

Please elaborate what "changes the color values of the output video" means.
Your console output looks fine.

[LordHDL]

When examining the pixels with a color tool (macOS has a preinstalled one called Digital Color Meter), the RGB values do not match the source. Recording with other software that supports these pixel formats (Syphon Recorder, OBS, etc.) will preserve the correct values, as will taking simple png/tiff screen shots. When using Digital Color Meter, select "display native values" to see 8-bit RGB, and compare a source (solid colors work best) with a media player that is confirmed to display RGB correctly (ffplay).

[Balling]

The display of MacOS uses display-p3. You need to tag the RGB values as p3-d65 primaries and as sRGB transfer. Tiff and PNG have an ICC profile while OBS may read sRGB swapchain. Please attach all needed files.