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Famous YouTuber Badal beautifully explained the difference in compression rate of YouTube and IMAX 3D. In the last scene of ‘Rama’ Tease there was a deep ditch which went unnoticed because of YouTube compression but felt scary in 3D. The Previous adaptation of Ramayana has defamed the 3D to...

32,854 views • 5 months ago •via X (Twitter)

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DreamCraft3D: Hierarchical 3D Generation with Bootstrapped Diffusion Prior paper page: present DreamCraft3D, a hierarchical 3D content generation method that produces high-fidelity and coherent 3D objects. We tackle the problem by leveraging a 2D reference image to guide the stages of geometry sculpting and texture boosting. A central focus of this work is to address the consistency issue that existing works encounter. To sculpt geometries that render coherently, we perform score distillation sampling via a view-dependent diffusion model. This 3D prior, alongside several training strategies, prioritizes the geometry consistency but compromises the texture fidelity. We further propose Bootstrapped Score Distillation to specifically boost the texture. We train a personalized diffusion model, Dreambooth, on the augmented renderings of the scene, imbuing it with 3D knowledge of the scene being optimized. The score distillation from this 3D-aware diffusion prior provides view-consistent guidance for the scene. Notably, through an alternating optimization of the diffusion prior and 3D scene representation, we achieve mutually reinforcing improvements: the optimized 3D scene aids in training the scene-specific diffusion model, which offers increasingly view-consistent guidance for 3D optimization. The optimization is thus bootstrapped and leads to substantial texture boosting. With tailored 3D priors throughout the hierarchical generation, DreamCraft3D generates coherent 3D objects with photorealistic renderings, advancing the state-of-the-art in 3D content generation.

AK

161,530 views • 3 years ago

have been having a SUPER weird time with youtube compression while working on my short film - any youtube experts able to weigh in here? the attached video has some examples but the text summary is: - uploaded 20 versions of short film - shot on fx3/6, plan was to upload in prores422hq 4K - versions 1-4 were slightly outdated versions of the edit - v5 was finally ready to post but the compression quality on it nosedived compared to v2,v3,v4 - haven't been able to recreate the higher compression quality of v2-4 in ANY uploads since - on PC, v4 looks good 👍 in medium shadows such as in the intro scene, but blocky 🚨 in the dark corridor - on Mac, v4 looks good 👍 in the medium shadows AND good 👍 in the dark corridor - on PC, v5-v20 looks bad 🚨 in any shadows at all, and blocky 🚨 in the dark corridor - on Mac, v5-v20 looks bad 🚨 in the shadows and blocky (and flashes weirdly) 🚨 in the dark corridor - no matter what settings I try, I can't seem to recreate the compression of v2, v3, v4 - part of me wonders if it's because they were uploaded close to the posting of an actual published video which might mean youtube gave us favourable compression for a few vids before reverting? I really don't know tbh - note: the codec youtube is giving us for ALL the versions when displayed on windows are the same av1. on all mac versions it's vp9. doesn't seem to be caused by a codec difference - have tried uploading in 8k, different colour space, adding sharpen, h264 instead of prores 422hq, prores4444, etc etc. nothing has brought back the compression quality of v2-4, they all suffer from same problem - reuploading the source v4 file resulted in worse quality the second time seemingly? any ideas here would be super appreciated, this compression flashing and glitching through the shadows has been the bane of my existence all week lol. TeamYouTube would love if you could lend a hand here too

Milo

25,843 views • 14 days ago