I ran a command like this:
.\..\ffmpeg -i [Input] -i [Output] -lavfi ssim="stats_file=ssim.log" -f null -
and saw this in the ssim log outputs:
n:70 Y:0.947271 U:0.985112 V:0.985611 All:0.959968 (13.975937)
I understand the values for everything except for the value in the parentheses, after All (13.975937). Is this the db representation of the YUV,All values, or is it something different? How is it calculated? Thank you.