Quote:
Originally Posted by ff58
I want to see the effect of changing encoder parameters and determine the best configuration. So, you say that the best way to evaluate the quality is the subjective evaluation?
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Yes, definitely.
There are many examples where objective metrics (like PSNR or SSIM) can give a misleading results. As mentioned before, the "Psy" optimizations in x264 are known to give a huge
perceived quality boost, but if you only trusted on PSNR or SSIM, you would think they
reduce the quality. What you can learn from this is that objective metrics
can be helpful for some tasks (sometimes you simply have to get "hard" numbers), but you should never blindly trust them. Basically, all commonly used metrics measure the "error" between the original and the encoded video and then express "quality" as the absence of error (assuming "perfect" quality for the original). That works up to some point, but it's not how the human eye works. Sometimes
more "error" looks better than smoothing all the details out...