Thus the CRF will very some based on the mature of the footage and who is working on it. If that's ok will depend on how you perceive quality. By that I mean if you have a scene that is say 90% static and 10% high motion, you might hit the target crf overall, but still have some blocking in the 10% section. Not to mention the crf target is for the entire frame, thus a certain amount of "averaging" is going on across the frame and scene. What one person might perceive as excellent quality might only be considered ok by someone with better visual acuity. The choices they made where based on perceived quality, and thus aren't absolutes. Just as you said in the first quote, the crf values where chosen by developers. I have to say I disagree with the second quote, as it's to broard a statement. By setting CRF value you choose what quality you want- then you don't worry if you have noisy or crazy clean master. CRF mode adjusts bitrate to source nature keeping relative quality the same for difference sources and this is beauty of it. 30Mbit, other 60Mbit average bitrate).Īndrew Kolakowski wrote:And no- you don't need to adjust CRF to source nature. It will do its magic (one will end up with e.g. Netflix latest one is probably the most accurate.Īnd no- you don't need to adjust CRF to source nature. SSIM/PSNR etc are only half good as it's very difficult to make metric which reliably represent visual perceived video quality. For web those bitrates are still problematic (to high). Blu-ray bitrates- they allow to get very decent end user quality. In terms of final quality I'm more happy with e.g. We want to use something lower here as we doing intermediate step master. Those quoted CRF values are "chosen" by x264/5 developers, but they are for " final encode/quality". x264 and Resolve h264 encoder separately as they are not as efficient. By doing so you can find at what source bitrate you start being so close with final youtube quality against uncompressed upload that there is no point raising upload bitrate any further. You don't want to analyse bitrate in 2nd graph (youtube uses fixed profiles as far as I understand), but quality.
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