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I had a gig years ago to work on the digital asset management system that was used by a good chunk of the studios in Hollywood. Last time the summer olympics were on there were quite a few 45Mbit broadcast masters on torrents and usenet. Even if we have a digitally generated source generated without any antialiasing, the 4x supersampling is lost here as it is a high frequency component which would be unlikely to survive quantization.Īt the very least downsampling averages quantization noise more than real-world signal.īroadcast Masters are typically around 45Mbit affairs so that the station can add a channel bug and recompress without noticeable artifact.
#True hd videos 1080p full
This means each sample has full luma resolution but 2x2 chroma undersampling. H.264 and VP8 natively store data as YUV 4:2:0 unless told otherwise (and on YouTube, they're not). A "natural" source via a lens and sensor will inherently "supersample" to a very large degree (ratio of size of Airy disc to the sensor dimensions, assuming an optically perfect lens with perfect focus, a real lens will further skew the metric towards "no difference") as the sensor elements have a finite size. Only if the content is digitally generated. You've done exactly the same as 4k vs 1080p, just with fewer pixels.
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If you want to test, just downsample 1080p to 540p, encode as usual, then resize the 1080p source in your player (as this is what a 4k source to a 1080p display does) to 540 pixels high. The end result is that a 4K source and an identical 1080p source, when compressed at the same settings by the same encoder, will look nearly identical within a very high SSIM.
The remaining "quality" is discarded in H.264 or VP8 compression. The "quality jump" of 4x supersampling (this is all you're doing) is almost completely lost when the content is subsampled to YUV 4:2:0 for transmission. The quality jump of downsampling from a good 4k camera is noticeable, even if they remain on a 1080p workflow for some time. on youtube) to purchase 4k cameras before the rest of their workflow is 4k ready. It's not unheard of for content creators (e.g. The way a digital image of real objects is downscaled is somewhat better than how it's inherently sampled by the sensor (less noise especially). The remaining part is that a 4k camera will capture more detail, and at the very least those videos are shot on 4k cameras. And certaintly if it was delivered in 1080p, x256 wasn't used to create that copy. Whatever format it was filmed in, it was likely not delivered in that format for broadcast. If you have any knowledge of that, then do share. I don't know in what format it was originally filmed. What you are saying is that you think that they filmed in HD, uprezzed to 4K, you downrezzed back down to 1080, and the quality was still better than 1080.ĭoesn't it seem more likely that they filmed in 4K, they down rezzed for broadcast, then released it in 4K later? You do realise that Breaking Bad was originally broadcast in 2008, in 1080p? The 4k was released as remastered, implying that the original filming format wasn't 4k.
4k seems unlikely, I am guessing it was delivered in the intended format for broadcast.
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The TV station must have recieved the series in some format ready for broadcasting.
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So you were able to download the 4K version, but you don't think that they had a 4K source to make the 1080 version from. 1 Atmos x264-CMRG.It that either the original 1080p stream didn't have a 4k source to work with, or that x2 1080p BluRay 10bit HDR Remux TrueHD Atmos [Org Hindi DD+7. the latest music, albums, songs, music videos and more updates.
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