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10th December 2012, 14:09 | #16141 | Link |
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You should check "My display is already calibrated" and select for what colorspace it was calibrated, most likely BT709
Of course this means your device was properly calibrated against a standard test signal, and not the output of some broken cablebox or something.
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10th December 2012, 15:02 | #16142 | Link | ||
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anyway, after the story of HD being encoded to BD with non-specs-compliant primaries, yet another uncertain spec to deal with Quote:
Last edited by leeperry; 10th December 2012 at 15:55. |
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10th December 2012, 18:21 | #16144 | Link | |
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There are black/white/black transitions at the edge of the 720 line 601 frame, and again at the edge of the 702 line active line area? If you see two pulses at the edge of frame, the full 720 line payload is surviving, if you only see the inner pulses, you're only seeing the 702 central section surviving? Or am I misreading this? Isn't the first pulse sample 0-5, black from 6 to 9 (with active 702 samples starting at sample 8?) and then another pulse sample 10-15 ? I don't think that test signal defines 4:3/16:9 active as 706 lines does it? Last edited by Sneals2000; 10th December 2012 at 18:24. |
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10th December 2012, 18:28 | #16145 | Link | |
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Assuming that the presence of picture content outside the 702x576 central section implies non-ITU 601 compliance is not a safe assumption. |
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10th December 2012, 18:37 | #16147 | Link | |||
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Phew! Don't want to offend. Love MadVR!
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Of course some kit and software may not be fully compliant - but I would expect compliance to be an aim. However as more and more channels are originated in HD, with their SD variants just a straight downconvert at the end of the playout chain, the only device that will dictate their compliance (or non-compliance) will be the HD->SD downconverter, which actually makes things a lot simpler as this becomes the only real place (apart from distribution/emission encoding) where things could get scaled incorrectly. I would expect all mainstream broadcast downconversion products to be fully ITU 601 compliant - so the HD to SD downconversion will be to the central 702x576 area in a 720x576 frame. Quote:
Be interesting to know what real DVD and Blu-ray players do when they upconvert. |
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10th December 2012, 19:05 | #16149 | Link | |
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I tried this myself several times (but in my case, I used NTSC DVDs of older anime). In my experiments, in all DVDs I tried (and where I found usable frames for checking) I discovered that they were most likely to have been created assuming ITU scaling. (Edit: Actually I think I found one case where it was inconclusive, too. I couldn't tell which was the right way there). That is, for NTSC a 4/3 source looked right at 720x527, not at 720x540. A 16/9 source looked correctly at 875x480 and not at 853x480. Of course, it is still just anecdotal evidence, but I think that professional authoring teams do use ITU. (The dvds were old anime material, but included both older releases from early 2000s and more recent remaster releases). Anyway, now I always assume that DVDs use ITU scaling. it might be an opinion, but I chose to err on the side of specifications Last edited by mandarinka; 10th December 2012 at 19:17. |
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10th December 2012, 19:32 | #16150 | Link | |
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However, I also have some (not too many, enough) DVD movies that definitely do not use the full frame (looks like they crop 2.5 pixels from both left and right), so I'd assume ITU scaling should be used for them. I don't have the BDs for comparison. Also, I don't know how BluRays handle SD content, is it encoded with ITU scaling instead of "pure Pixel Aspect Ratio" at all? Personally, I'd assume that since BD was created with Digital Video in mind, the SD content on BDs might just as well use "simple", non-ITU scaling. Maybe (I doubt it, though), there could also be rules that only apply when the input is MPEG-2 and one of the 2 standard resolutions. Though, I believe that Aspect Ratio correction should actually be the Splitter's work... |
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10th December 2012, 19:34 | #16151 | Link |
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I'm planning to upgrade my current 8800GT video card with a GTX650ti after the holidays. They have 2 variants of this card, 1GB and 2GB. Will I see any benefit going with the 2GB version of card if I strictly use it for HTPC (madVR, LAV Filters, Reclock)?
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10th December 2012, 20:15 | #16153 | Link |
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I have a GTX650Ti with 1GB GDDR5 and it handles everything I can throw at it with LAV+madVR+Re-clock running. Jinc and anti-ringing are set and GPU load rarely goes above 10% and temperatures, on the hybrid active/passive cooled MSI card, are never higher than 45C with the most challenging of upscaling. With 1080p it is just ticking over. Can't think why you wopuld need 2Gb unless you are gaming, in which case a GTX660 would be more appropriate.
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10th December 2012, 21:27 | #16154 | Link | |
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2GB is already overkill for most games FWIR.. Last edited by leeperry; 10th December 2012 at 21:45. |
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10th December 2012, 22:47 | #16155 | Link | |
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10th December 2012, 23:18 | #16157 | Link |
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It allows subtitle filters to draw the subtitles with the full display resolution (and in 4:4:4) instead of just with the source video resolution (mostly 4:2:0). madVR will then overlay the subtitles itself onto the video image before output. This potentially increases quality and is compatible with native DXVA2 decoding. MPC-HCs internal subtitle filter already uses a similar interface.
Currently no subtitle filter supports this, but the xy-vsfilter team is working on it. Last edited by sneaker_ger; 10th December 2012 at 23:22. |
11th December 2012, 01:04 | #16160 | Link | |
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If you A/D and D/A sampled the analogue output of an analogue 1" VTR in 1985 you wouldn't want just 1 sample of latitude either side... ITU 601 pre-dates modern digital compression and transmission systems by many, many years. If you're asking why bother now - many do in fact use 704x576 for broadcast. However intermediate kit should pass the 18 samples outside 702x576 (for the same reason they are sampled in the first place) Last edited by Sneals2000; 11th December 2012 at 01:06. |
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Tags |
direct compute, dithering, error diffusion, madvr, ngu, nnedi3, quality, renderer, scaling, uhd upscaling, upsampling |
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