I just took a look at AVSMeter, though I don't understand it's output... plus it was like 10 times faster than encoding.
Code:
AVSMeter 2.9.7 (x64), 2012-2019, Groucho2004
AviSynth+ 0.1 (r2772, MT, x86_64) (0.1.0.0)
Number of frames: 32339
Length (hh:mm:ss.ms): 00:21:33.560
Frame width: 716
Frame height: 576
Framerate: 25.000 (25/1)
Colorspace: i420
Frames processed: 32339 (0 - 32338)
FPS (min | max | average): 684.7 | 1487 | 1242
Process memory usage (max): 37 MiB
Thread count: 44
CPU usage (average): 9.7%
Time (elapsed): 00:00:26.046