Doom9's Forum - View Single Post - VMAF - Video Multi-Method Assessment Fusion

WorBry · 13th March 2019, 04:48

Finally got around to re-testing the Crowd Run 2160/50p x264 series that I kept from earlier tests with v3:

https://forum.doom9.org/showthread.p...16#post1865316

So this was testing with VapourSynth VMAF v4 in Model=1 mode which uses vmaf_4k_v0.6.1 by default (CI=False) and vmaf_4k_rb_v0.6.2 when set to CI=True.

Now in this case CI=False and CI=True produced the exact same aggregate VMAF scores, which came as a surprise:

Now how is that ? The Confidence Interval doc doesn't mention 4K models specifically but I would assume the 'rb' in 'vmaf_4k_rb_v0.6.2' means 'residue bootstrapping', in which case why is residue bootstrapping used to derive CI scores for 4K video, whereas the CI model for HD/SD (vmaf_b_v0.6.3) uses plain bootstrapping ? All rather confusing.

13th March 2019, 04:48	#89 \| Link
WorBry Registered User Join Date: Jan 2004 Location: Here, there and everywhere Posts: 1,197	Finally got around to re-testing the Crowd Run 2160/50p x264 series that I kept from earlier tests with v3: https://forum.doom9.org/showthread.p...16#post1865316 So this was testing with VapourSynth VMAF v4 in Model=1 mode which uses vmaf_4k_v0.6.1 by default (CI=False) and vmaf_4k_rb_v0.6.2 when set to CI=True. Now in this case CI=False and CI=True produced the exact same aggregate VMAF scores, which came as a surprise: Now how is that ? The Confidence Interval doc doesn't mention 4K models specifically but I would assume the 'rb' in 'vmaf_4k_rb_v0.6.2' means 'residue bootstrapping', in which case why is residue bootstrapping used to derive CI scores for 4K video, whereas the CI model for HD/SD (vmaf_b_v0.6.3) uses plain bootstrapping ? All rather confusing. __________________ Nostalgia's not what it used to be Last edited by WorBry; 13th March 2019 at 14:59.