1/25/2024 0 Comments Renoise output bitrate![]() With trellis / rdoq, it even tweaks the quantization to compress well with the final entropy-coder (e.g. Remember that both h.264 and h.265 store the information in the video as quantized frequency-domain coefficients. 8-bit h.265 has higher-precision motion vectors than 8-bit h.264, so that part of the reasoning doesn't apply to x265. X264 does benefit in general from running in 10-bit mode even when the original source is 8-bit, and so is the final display (but again, you shouldn't expect the same CRF to give the same bitrate or the same quality at different depths). A lossy video codec like h.265 isn't very similar to simple lossless compression like ZIP. It's definitely nowhere near a factor of 12/8 like some commenters are suggesting based on "simple math". Even if there is a small gain, it may not be worth the speed penalty. ![]() I haven't followed the latest discussions, so I'm not sure what the current consensus is on 10-bit x265 for 8-bit video. See discussion on doom9, linked by Michael in a comment. 10 or 12-bit might even look a tiny bit worse. There may still be some gains in compression efficiency for x265, but they're definitely smaller if they exist at all. Pause/zoom helps when checking your visual impression of "sharpness" / "more detail", so figure out what was giving you that impression, and maybe also other things to look for to see if you can still notice them while playing the video.)įor actual encodes once you find settings that you like, CRF is great, but it's no good for comparing the quality-per-bitrate of different encode settings. Some kinds of artifacts / distortion are noticeable when the video is playing, but many are a lot less noticeable. (Some people like to pause/zoom, but don't just do that. Use either SSIM or preferably human visual inspection. So if you want to compare settings, use 2pass with the same bitrate for both and look at quality. 8, but not with 12).ĬRF is not an exact target-quality setting. Presumably the bigger files also look a bit better, since 12-bit x265 has about the same quality per bitrate as 8-bit x265. You haven't said anything about quality, or quality-per-filesize. (Either the same SSIM or the same perceptual visual quality). ![]() If you're trying to find some encode settings that work well for some content, you shouldn't assume that the same CRF at different bit depths is going to be the same. Writing library : x265 1.9+194-6d3849d648f0be5a: 12bit: KG7x Įncoding settings : wpp / ctu=64 / min-cu-size=8 / max-tu-size=32 / tu-intra-depth=2 / tu-inter-depth=2 / me=3 / subme=3 / merange=57 / rect / amp / max-merge=3 / temporal-mvp / no-early-skip / recursion-skip / rdpenalty=0 / no-tskip / no-tskip-fast / strong-intra-smoothing / no-lossless / no-cu-lossless / no-constrained-intra / no-fast-intra / open-gop / no-temporal-layers / interlace=0 / keyint=250 / min-keyint=23 / scenecut=40 / rc-lookahead=30 / lookahead-slices=4 / bframes=8 / bframe-bias=0 / b-adapt=2 / ref=4 / limit-refs=2 / limit-modes / weightp / weightb / aq-mode=1 / qg-size=32 / aq-strength=1.00 / cbqpoffs=0 / crqpoffs=0 / rd=6 / psy-rd=2.00 / rdoq-level=2 / psy-rdoq=1.00 / no-rd-refine / signhide / deblock=0:0 / sao / no-sao-non-deblock / b-pyramid / cutree / no-intra-refresh / rc=crf / crf=18.0 / qcomp=0.60 / qpmin=0 / qpmax=51 / qpstep=4 / ipratio=1.40 / pbratio=1.30Ĭrf=18 rate-control produces bigger files in 12-bit mode. Writing library : x265 1.9+54-291beccb6760: 8bit+10bit+12bitĮncoding settings : wpp / ctu=64 / min-cu-size=8 / max-tu-size=32 / tu-intra-depth=2 / tu-inter-depth=2 / me=3 / subme=3 / merange=57 / rect / amp / max-merge=3 / temporal-mvp / no-early-skip / rdpenalty=0 / no-tskip / no-tskip-fast / strong-intra-smoothing / no-lossless / no-cu-lossless / no-constrained-intra / no-fast-intra / open-gop / no-temporal-layers / interlace=0 / keyint=250 / min-keyint=23 / scenecut=40 / rc-lookahead=30 / lookahead-slices=4 / bframes=8 / bframe-bias=0 / b-adapt=2 / ref=4 / limit-refs=2 / limit-modes / weightp / weightb / aq-mode=1 / qg-size=32 / aq-strength=1.00 / cbqpoffs=0 / crqpoffs=0 / rd=6 / psy-rd=2.00 / rdoq-level=2 / psy-rdoq=1.00 / no-rd-refine / signhide / deblock / sao / no-sao-non-deblock / b-pyramid / cutree / no-intra-refresh / rc=crf / crf=18.0 / qcomp=0.60 / qpmin=0 / qpmax=51 / qpstep=4 / ipratio=1.40 / pbratio=1.30 The results are, the 8bit output was smaller. ![]() Just got curious of this x265 HEVC format, and tried it on a 1920x1080i BDMV stream video, one encoded with 8bit depth and then another encoded with 12bit depth.
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