The "deinterlace" is done very poorly. Back when I was an encoder, I've used JIVTC or VIVTC for such stuff iirc. Nowadays there are maybe better alternatives tho. Apart from that it seems that 4K channels are looking much better than old 1080i TV channels, probably still not as decent as some streaming services tho.

@eXmendiC Makes sense when you consider that 1920x1080i is just in reality 1280x720p, while "4Ki" 3840x2160i is 1920x1080p. So in a sense these 4K broadcasts are closer to 1920x1080 progressive videos like WebDLs. And yeah performing good deinterlacing is not easy, it never was and technically something always gets lost during the process but things have surely advanced a lot from the days when I used to do my own DVD encodings and TV rips back when I used to encode and sub stuff. A good deinterlacing should make 1080i look exactly like 720p or very close to 1080p thanks to interpolation and blending, the same should apply to 3840i to look like native 1080p possibly even a little bit sharper.

>Makes sense when you consider that 1920x1080i is just in reality 1280x720p, while “4Ki” 3840x2160i is 1920x1080p. that doesn't make sense

>Makes sense when you consider that 1920x1080i is just in reality 1280x720p, while “4Ki” 3840x2160i is 1920x1080p. Wat.

Hello everyone! I just checked about 4K source in Japanese television was progressive or interlaced, and here is the answer: https://ibb.co/CKcYmhCK You can see, the output showed that was progressive. So I don't use any deinterlace for these 4K sources. But yeah, it's only upscale from 1080p to 4K so the quality "not like" 4K.

@herkz @LightArrowsEXE I'm surprised people don't know how interlacing works and the differences between it and progressive, in simple terms interlaced video is always half the resolution of progressive video, as each frame only has 1 half of the video aka 1 field. So 480i is 240p, 720i is 480p, 1080i is 720p, 2160i is 1080p. p stands for progressive video not pixels btw. Interlacing always carries a loss, and you can't never truly get back the information that you lose with it as half of each frame is discarded but you can make it look good with interpolation and blending and as long as there isn't too much motion, blending 2 fields is almost transparent to the human eye, unless you look at each frame in detail. In essence even if you deinterlace e.g a 480i video and leave it as 480p as deinterlace software normally does, it is a fake 480p obtained from blending fields, is not real 480 progressive, is more like an upscaled 240p image. Same applies to 4Ki in reality it is a fake 2160p or a "upscaled" 1080p image made from blending and interpolating the odd and even fields from 2 frames or more. This is just like how interlaced video is not really 29.97 or 59.94fps but 24 fps or 1000⁄1001 23.976 fps. Because for each frame there are 2 incomplete fields with half the resolution. That's why interlaced is always half the advertised resolution, get it?. It was literally conceived to save bandwidth in the analogue days and make low resolution appear double the resolution by tricking the human eye thanks to how we perceive motion. We never had 480p back in those days it was 240p the whole time. The real question is why in God's Green Earth are broadcasters still using something so obsolete as interlacing to this day to save bandwidth when we have so many advancements in encoding and compression.

@Nanako It seems to be interlaced, the framerate gives it away, since it's 59.94fps but it's being wrongly encoded/broadcasted as progressive even though it is clearly interlaced, that makes things harder since that tosses a lot of information about how it is interlaced which makes the process of deinterlacing more complicated and less effective. I have access to some Japanese TV broadcasts and they're indeed interlaced 1080p, I don't have access to any 4K broadcasts but maybe your provider/hardware or even the channel is incorrectly setting the video as progressive even though it is interlaced, so in the end the video ends up being interlaced when encoded from the Transport Steam and that's why it looks so bad with artifacts as modern screens can't deal with interlaced video.

no, we know how interlacing works lol. all of us have been encoders for years. 720 just isn't half of 1089. 540 is. i mean there's more weird things you said i could mention but i'm lazy.

"The real question is why in God’s Green Earth are broadcasters still using something so obsolete as interlacing to this day to save bandwidth when we have so many advancements in encoding and compression.". The 4K standard doesn't support interlaced video, nor is any broadcast on any BS 4K station interlaced. The source is progressive. Maybe the master isn't, but we don't see that. The transport stream is progressive scan.

Hello everyone! Many people want to know about BS 4K, so I'll provide here some sample sources: https://113.gigafile.nu/1218-h09a02c1f6b34ea2523914a3099c0ca6f https://download.blog.naver.com/open/c653da697a2122fed3315d675eb9cdbc1e4fb850f4/EFsQaLdDxL7O9NI2E-QRigSVEg-Y4fBockcNcldhlgcuHom6Vn0m5Pa7ZIQk5ndTzSS2QuEfHHeLV3e4XQZ_WNbKgD0/4k-m3u8-sample.ts

@herkz I was too lazy and I completely forgot to check the comments again, but yeah you have a good point, and is technically correct but 540p and 1440p are not official broadcast/video standards, that's why 720p gets upscaled to 1080p and not 2560x1440p and why 1080p is downscaled to 720p, hence why interlaced video follows the same rule, the official standards are SDTV/HDTV/FHD/UHD, the introduction of 720p and later 1080p made things complicated as that didn't double the resolution as it was just 1.5x and came too soon after 720p, 1440p should've been the successor but I digress. Nothing I've said it's weird, it's common knowledge, I worked as a video engineer for 20 years, I wasn't just an encoder doing things for fun, it was my job too. [@AwfulCaps](https://nyaa.si/view/2019587#com-9) Also unlike what it was stated above the UHD standard does support interlaced video, I've seen it in terrestrial broadcasts and also HDMI supports 4Ki as a valid resolution and standard but it's not considered official because interlacing is dead and obsolete but TV broadcasters and some hardware manufacturers insist on using it even to this day.