VideoToolbox have wrong chroma displayed

Originator:hypernovagama
Number:rdar://46586329 Date Originated:December 10 2018
Status:Open Resolved:
Product:macOS SDK Product Version:10.4.1
Classification:VideoToolbox Reproducible:
 
Area:
VideoToolbox

Summary:
QuickTime struggles to reproduce the correct red color when using hardware decoding. 

Steps to Reproduce:
Find a video footage with high contrast between the red color and the background. Then you can see there are chroma artifacts near the edges. 

Expected Results:
Below is the same video footage opened in mpv with ffmpeg using software decoding. 

Actual Results:
There are chroma artifacts near the edges. The same or even worse result (see mpv with videotoolbox.png) can be seen in mpv using hardware decoding (essentially videotoolbox).

Version/Build:
QuickTime Player Version 10.5 (928.50)
mpv 0.29.1 with ffmpeg 4.1

Configuration:
macOS Mojave on MacBook Pro (15-inch, 2016). The issue seems not existing in older version systems.

Comments


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