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2nd September 2021, 19:25 | #22 | Link | |||||
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A key thing is the strength of the dither. With xscaler about a 0.5 worked pretty well to prevent banding without adding too much high-entropy noise that is harder to compress. Different kids of content benefit from different strengths. Lots of film grain can make dither unneeded, while clean-noise free CGI may need stronger as banding can become extra obvious. Anime can benefit from some more adaptive techniques, as dithering flat areas is undesired, but gradients need it, and thresholding would be a big problem using a "dither/don't dither" mask instead of having variable strength. Quote:
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Truncation can also increase QP and ringing, as truncation can leave sharper edges that aren't DCT-friendly. An optimal ditherer would probably have different strengths at different luma levels. And even be in-loop with the encoder so it could adjust dynamically adjust how dithering is done relative to QPs. |
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18th September 2021, 21:32 | #24 | Link |
Broadcast Encoder
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Yeah, well, generally post-processing like LUT Conversion and other kind of filtering is done in 16bit anyway, so we still kinda need something to go back to 10bit as that's how we go out to our viewers for UHD materials and Floyd Steinberg is still very much needed eheheheh
About FULL HD... well... In Italy we're still stuck with XDCAM-50 MPEG-2 8bit, so... (that's my face every time I have to encode in MPEG-2 in 2021) |
19th September 2021, 09:27 | #26 | Link |
Derek Prestegard IRL
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LOL yep, who cares? They're going to just uplink with some craptastic live encoder that's probably not even set up in a reasonable way (either due to ignorance or negligance). Broadcast is brutal when it comes to video quality.
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20th September 2021, 13:58 | #27 | Link | |
Broadcast Encoder
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The UHD one instead is an XAVC Intra Class 300 10bit 50p at 500 mbit/s which is encoded live by an hardware encoder in H.265 10bit at 25 Mbit/s. I mean, it's not such a terrible quality to be fair, especially considering that all this is live. (Of course VOD has more bitrate and most importantly a better, more complex encoding, but still Satellite is still very much alive and kicking eheheheh). |
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16th August 2023, 06:17 | #29 | Link |
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This thread makes me want to benchmark all the available MPEG2 options for the rare times I have to make a DVD. I'm using CCE SP3 for this, even still. Although the last time I compared encoders was in the late 2000s.
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22nd August 2023, 19:20 | #30 | Link | |
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I know that Elemental was still making good money with big MPEG-2 compression efficiency improvements within the last decade. Cables companies would pay a lot to get more channels out of fixed bandwidth. The MIPS/pixel we can apply to MPEG-2 encoding today is >>100x than back in the Minerva days. If there was a market reason for a new MPEG-2 encoder, I bet we could squeeze out another 25% using ever more advanced preprocessing and psychovisual optimization. |
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