Poll about prefered scaling quality

https://github.com/MiSTer-devel/Main_MiSTer/wiki

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What scaling quality you like more

Polyphase like in release before 20181015
10
36%
Near Neighbor like in release 20181016
18
64%
 
Total votes: 28

bluescrn
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Re: Poll about prefered scaling quality

Postby bluescrn » Sat Oct 20, 2018 11:23 am

vanfanel wrote:And, worse of all, we can't do our own builds because Quartus Standard is +2000USD! So it's a dead-end if only NN is available.


This seems to be a significant problem with the MiSTer project at the moment. If people can't easily experiment/tinker with the project, they're less likely to get involved in more serious development and maintenance of cores.

Is it just the HDMI output IP that requires the pricey license? - and is it technically possible to use the HDMI output without it? (if so, is there any code in the OSSC project that may be reusable here?)

(Sorry if it's a silly suggestion, I'm a newbie to FPGAs)

NegSol
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Re: Poll about prefered scaling quality

Postby NegSol » Sat Oct 20, 2018 1:35 pm

bluescrn wrote:Is it just the HDMI output IP that requires the pricey license? - and is it technically possible to use the HDMI output without it? (if so, is there any code in the OSSC project that may be reusable here?)


HDMI output IP license is only required for compilation of a portable binary (.rbf) that has no run time limitation. Compilation is free for development rigs that upload binary directly to DE10 Nano. Also VGA Output does not require any HDMI IP (see lite versions of cores).
Anybody complaining about the license does not understand the development process IMHO. New source code could always be compiled into .rbf format by persons having access to a proper license.

Sorgelig
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Re: Poll about prefered scaling quality

Postby Sorgelig » Sat Oct 20, 2018 11:18 pm

bluescrn wrote:and is it technically possible to use the HDMI output without it?

HDMI output doesn't require license. Only Scaler IP requires a special license. You are free to write your own scaler which won't require license. And most likely OSSC code can be re-used. Technically speaking OSSC is NOT scaler. It's simple scandoubler/tripler. It requires exact PAL/NTSC input frame rate to be able output correct HDMI video.
All cores already include scandoubler for VGA.
HDMI is more strict to output formats so in general case Video from most cores aren't compatible with HDMI standard. That's why scaler with frame conversion is required. OSSC cannot do this.

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Newsdee
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Re: Poll about prefered scaling quality

Postby Newsdee » Sun Oct 21, 2018 7:42 am

If I'm not mistaken the OSSC uses no RAM so is incapable of converting frequencies with a frame buffer. While this means it's lagless, it also means the output won't always be compatible with displays (or have scaling issues like the MiST VGA output).

Sorgelig
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Re: Poll about prefered scaling quality

Postby Sorgelig » Sun Oct 21, 2018 11:35 am

Newsdee wrote:If I'm not mistaken the OSSC uses no RAM so is incapable of converting frequencies with a frame buffer. While this means it's lagless, it also means the output won't always be compatible with displays (or have scaling issues like the MiST VGA output).

As i've wrote above OSSC is not scaler. It's scandoubler(trippler for 240p) - nothing more. It follows input frame rate as it lacks frame buffer.


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