FFmpeg/FFprobe - detect blank/empty/white image

Question

Is it possible, using ffmpeg or ffprobe, to detect if an image is blank? Only containing a single color, e.g. White.

I have done some digging and have come up with nothing at all, I don't even know if this is possible. I intend to execute via a batch file.

Thanks for any pointers.

Answer 1

for /f "tokens=* USEBACKQ" %%f in (`ffprobe -f lavfi -i "movie=test.png,signalstats" -show_frames`) do (
set /a line=!line!+1
if !line! EQU 33 set ave=%%f
)

if "!ave:~27,3!"=="235" echo WHITE