30 June 2013, 00:49 | #61 | |
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30 June 2013, 11:42 | #62 | ||
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from my point of view, he start defending (?) Amiga from every aspect, just to prove obvious thing (one that all we already know): that Amiga hardware is superrior to ST. and thats brings us here. my bad is that I continue to answer to him but since he obviously have knowledge, why not continue even offtopic. anyway, I should disclosure my agenda. (english is not my frist, not even second language so please have some apprehension ) my final goal is to made website where you could compare Amiga and Atari (and some Macs) computers with PC through achievements in time. it will include birth of today mainstream software (CuBase, Lightwave, 3D Max, Logic, Office...), and live demonstration what you could do with Amigas and Atari back in 80s... and what with PC. to comapre them and to show how PC manage to slow down computer industries! Douglas Adams describe this problem in one sentence: "The idea that Bill Gates has appeared like a knight in shining armour to lead all customers out of a mire of technological chaos neatly ignores the fact that it was he, by peddling second rate technology, led them into it in the first place, and continues to do so today." back on (off)topic: Mrs Beanbag thanx for answering, did not know that Amiga has 4 DACs! Quote:
Atari ST have external ASCI port for almost 2MB/s. Why ASCI? In 1985. SCSI was not finished (specification was not finalize). Atari anyway built in ASCI which is very similar to final SCSI but it is not 100% compatible. Atari produced CD-ROMs, harddisks and laser printer for it (Atari SLM laser printer was the first "windows" printer - printer that has no CPU or memory). 3.5MB/s on ST? Mr. Petari made adapter for CF Card that is connected throug ROM port (cartridge). ROM port has all MC68000 adres and data signals but it lack two signals that are important for hispeed writings. you can read more on: http://forum.8bitchip.info/hardware-...g1064/#msg1064 http://forum.8bitchip.info/software-...ayback-on-ste/ http://forum.8bitchip.info/software-...g1007/#msg1007 btw pandy71 do you have some links regarding "noiseshaping"? |
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30 June 2013, 13:27 | #63 | |||||
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Do you agree for such comparison and why NOT? Yes - most of activities on Atari ST scene is related to recreate or emulate some Amiga native capabilities - why compare something like that? And pictures are to illustrate that some graphic capabilities are out of scope simply due of differences between hardware - different hardware and direct comparison will be unfair from Atari ST point of view - remain part is well known - 11.3% faster CPU clock for ST will make slight difference. Quote:
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You can't compare Amiga to ST as you can't compare Macintosh to ST - HW differences are to big - btw i'm not sure is there demoscene for Macintosh? You can compare applications and "productivity" but this is completely different thing than you started this topic. Quote:
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As plain Amiga have no HDD interface and A600 first with HDD interface have known limitations (PIO mode + other implications). There is lot links about noiseshaping http://wiki.hydrogenaudio.org/index....=Noise_shaping http://en.wikipedia.org/wiki/Noise_shaping Personally i use SoX http://sox.sourceforge.net/ which provide quite nice set various flavors of noiseshaping filters. I think some different technique can be used for PSG used in ST "In 2006, two MSX developers created an advanced encoder that converts a wave file to optimal PSG channel transitions using a Viterbi search. They replayed a 44.1 kHz wave file on a 23 year old MSX and achieved a higher signal-to-noise ratio than an 8-bit DAC. The Viterbi search is rather CPU intensive, so even though it would have been theoretically possible to use this method already in the 80's, there were no computers powerful enough to perform the analysis required." https://en.wikipedia.org/wiki/Genera...ced_techniques http://www.msx.org/downloads/related...cm-encoder-001 http://map.grauw.nl/articles/psg_sample.php Also 4 bit nonlinear DAC can be used on ST (part of PSG) but i think special tool must be created (ie noiseshaper that work with logarithmic steps not LPCM) But with modern technology (knowledge and processing speed) should be possible. |
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30 June 2013, 14:27 | #64 | |
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You turn this topic into proving already known fact: that Amiga is better than ST. ...anyway, if somebody fish to read about "DSP on 3D" graphics, you can visit Atari-forum: http://www.atari-forum.com/viewtopic...25174&start=25 (dml's posts) |
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30 June 2013, 20:11 | #65 | ||
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Nope You cheated with question but this is you right
And this is proof for this: "I would say that ST coders are far superior than Amiga 500 coders - they copy almost every amiga effect on less capable hardware!" http://www.atari-forum.com/viewtopic...232966#p232966 Your own words... and this was real point - you not doing fair comparison, you only trying to prove some thesis at all cost even bending truth to your perspective. Quote:
And seem that Atari guys are aware of the Falcon HW superiority vs plain A1200: http://www.atari-forum.com/viewtopic...232980#p232980 http://www.atari-forum.com/viewtopic...232984#p232984 Quote:
But when i saw your first message i pointed you that this is simple unfair - comparing A500 to ST and A1200 to Falcon. Be well. |
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30 June 2013, 21:48 | #66 |
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Actually YouTube won't convert 25fps material to 30fps - it will stay at 25fps. 30fps is just the maximum and anything above that will be converted. So the smoothness of those movie trailers and things like that can be displayed relatively intact. 50fps games can't be, of course.
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30 June 2013, 22:03 | #67 | |
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If so, a game orginally rendered and captured at 50fps would end up in motion on youtube looking smoother than a game captured at 30, perhaps not even noticably different to the original. |
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30 June 2013, 22:30 | #68 |
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@Steve T
YouTube uses a blend conversion, ie. it will mix the various frames together at an appropriate ratio. So while you in principle get all of the images jammed in there, the result is quite blurry (has a double exposure look to it). Whether it's better than just decimating to 25fps is a matter of taste, but I'd say it isn't (30 fps is only a 20% improvement over 25, after all). Rather just have a clear 25fps YouTube video and a true 50fps version for download somewhere else. |
30 June 2013, 22:58 | #69 |
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Way how YT process video depend who uploading video and how - for details you can ask Ben Waggoner who is currently Google guy (previously he work on VC-1 codec for Microsoft).
Anyway it is irrelevant as native video is not kept and final result highly depend from YT encoding, decoder and machine itself (PC have sometimes large jitter for video). I would say that for example Vimeo is much better as it offer chance to provide original video (native resolution and framerate). |
30 June 2013, 23:44 | #70 | |
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01 July 2013, 00:11 | #71 | ||
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and yes, I did not post this on amiga forum, but on atari forum, because I know that here will be at least one "pandy71" Quote:
I care to know which AGA demo works on stock A1200 PLUS FastRAM. --- btw Atari demos could be watch at http://dhs.nu/video.php ST PhotoChrome video could be found at http://8bitchip.info/forum/ |
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01 July 2013, 02:00 | #72 | ||
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Demo requirements are usually provided with demo itself - check http://pouet.net/ before starting "comparison". Be well. |
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01 July 2013, 07:48 | #73 | |
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Going from 60fps to 30fps (or 50 to 25) with frame blending just means that you have a 50/50 mix of two frames each time. I usually just drop 50fps to 25fps by simply leaving out the other frames - motion is not as smooth but frames are left perfectly clear. Some games present a problem when doing this, however, since they use a 50Hz flicker to simulate transparency or other effects (eg. Turrican, Superfog and many others). If you just drop frames here, the effect is lost (either you get a missing player character or no transparency/flicker at all). When uploading such material, I have used a custom blending filter, which attempts to retain the effect where it exists without blending entire frames. [ Show youtube player ], Turrican 2 and Lionheart are processed like that, others are just decimated to 25fps. @pandy71 Unfortunately Vimeo doesn't keep anything above 30fps either, it will get converted. |
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01 July 2013, 12:04 | #74 |
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yep, seems i was wrong - i've check all vimeo files i downloaded and all of them are bellow 30 fps (with sometimes strange framerates but anyway 30 or less). I need to check vimeo by some synthetic video - some up-loaders allow to download original file (mostly quicktime so it looks like untouched by vimeo).
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01 July 2013, 12:53 | #75 | |
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When you watch a demo and see an effect that looks much more impressive than the others, it has very likely been precalced/prerendered. Often, demos also have animations of course, but for the most part it's clear to the viewer that it's an animation. If you download Vision, you can see the 400KB animation file, but of course you don't see the files or even the filesize at compo time (or on Youtube). So in this case it's a bit devious since the framerate is so slow. And so you think they could maybe have done the impossible. Of course, it all becomes clear if you run it on a real Amiga or emu matching compomachine specs. There are various ways to make impossible things possible, f.ex. animation, precalc, prerender etc. There are some famous ones, I don't know if Alpha and Omega was first. It's obvious to a good coder that it's precalced, but that's usually a tiny part of the audience. You can test it out in WinUAE by doubling or halving the CPU speed and see if the framerate changes. There are two schools of thoughts on the realtime thingy. One is that realtime should be realtime and the other is "who cares?". Mostly, the realtime phalanx accepts general-purpose tables (ie. not made for the effect) on lower-spec machines. Also check out Dual Crew/Shining (DCS) and Skarla. From what I gather A1200+Fastmem was not the stock platform like OCS/1MB is, 030 cards arrived pretty quickly and was accepted as demoscene platform. The substantial advantage of Falcon to A1200+Fast only is that chunky mode and playing wav comes for free, so the CPU can just render. A 68030 vs 68EC020 at the same bus width and frequency is roughly 2.15x faster, with the faster clock that would be 2.46x faster. Last edited by Photon; 01 July 2013 at 12:58. |
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01 July 2013, 14:18 | #76 | |
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Below are a few with good 3D or other complex effects. Most of the videos were probably recorded on something faster, but I've watched all of them on real hardware (I've got both Hawk and Microbotics cards, pure memory expansions without faster CPU) recently and I've been impressed by their speed on A1200+fastmem. Wit Premium by Freezers is crazy fast: [ Show youtube player ] Mindflow by Stellar was designed for A1200 with FastMem [ Show youtube player ] The 4K intro Dawn by Artwork contains a really fast 3D engine which is impressively fast: [ Show youtube player ] G-Force by Pygmy Projects features shaded 3D without texturing and it's quite snappy: [ Show youtube player ] Motion by Bomb also contains some fairly complex 3D and runs smoothly - EXCEPT the final Doom world, which is quite jerky. I think the video is recorded using an 030 turbo. [ Show youtube player ] Nexus 7 by Andromeda runs fine on even an A1200 without fastmem and is still very impressive: [ Show youtube player ] Syndrome by Balance is another demo that is nice and fast with some 3D: [ Show youtube player ] Dove by Abyss is another nice one with a super funky soundtrack to boot: [ Show youtube player ] Last edited by carls; 01 July 2013 at 14:33. |
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01 July 2013, 14:26 | #77 |
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thank you!!
yes, main problem is that many videos of demos are recorded on faster hardware or on WinUAE with "unlimited" speed I also have A1200 (need to but FastRAM card) so it is good to know which one works on this hardware! |
01 July 2013, 14:32 | #78 | ||
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Make sure you get a good RAM board - the Hawk (and clones) is a real slouch. Microbotics MBX 1200z, Power Computing PC1204/PC1208 and the Blizzard 1200/4 all have better memory architecture. Last edited by prowler; 01 July 2013 at 21:14. Reason: Back-to-back posts merged. |
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01 July 2013, 15:19 | #79 |
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^
I got A1200 with Blizzard PPC, low end model. Can you explain me some more things: Is it possible to turn off 040 but use fast memory (and would speed be comparable to plain fast ram upgrade)? |
01 July 2013, 15:27 | #80 | ||
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Last edited by prowler; 01 July 2013 at 21:16. Reason: Back-to-back posts merged. |
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