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assiduous
Account closed
Registered: Jun 2007
Posts: 343 |
saving the screen
hi
I seek some way to save the screen on a real C64. I need to save everything from the screen (or asmuch as possible). Im equipped with Action Replay7 and i have already tried to tamper with the freezer options but it seems that with freezing certain elements from the screen are lost like raster bars or other effects. i also tried using the backup option in AR7 which saves the executable of the frozen C64 state but that doesnt seem to save the necessary elements of the screen either (they are generated in the next frame after executing the snapshot and thats not what Im after).
thx for any help. |
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assiduous
Account closed
Registered: Jun 2007
Posts: 343 |
thanks for all the replies.
as i said earlier using an emulator is out of the question- the effects i want to analyze dont seem to be emulated accurately in any of them.
i tried all different display modes that are available but with none of them I could get rid of scaling/blurring. if I could display it 1:1 or 2:1 without any blurring,that would do the trick but I seem unable to do so with my TV.
I dont know what you mean by the refresh rate being higher in Windows. afaik the refresh rate depends on the monitor/TV used. my TV refreshes at ~50FPS,the LCD monitor at ~60. any way i have no idea what benefit a higher refresh rate could make.
the usb capture device sounds like an idea to consider. I think that recording a few seconds of ~50 FPS video instead of just a static screen could come useful in analyzing some dynamic effects. if i understand it correctly I would get a clear digital 403x284 VIC output without any blurring distortions etc? and the fact that Im connecting this device to a 26 years old machine wouldnt really matter ? then thats something I am looking for. I would need a new cable probably- now Im using a standard 2 cinch audio-video cable. |
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assiduous
Account closed
Registered: Jun 2007
Posts: 343 |
OK done some insight. there are lots of seemingly cheap USB video capture devices. but one thing is abit worrying. The technical specifications usually say something like "25 FPS PAL". does that mean that adjacent frames would be blent into each other? :( thats not good,would disqualify it from being usable with any kind of effects that involves shifting pixels each frame. |
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JackAsser
Registered: Jun 2002
Posts: 2014 |
Quote: OK done some insight. there are lots of seemingly cheap USB video capture devices. but one thing is abit worrying. The technical specifications usually say something like "25 FPS PAL". does that mean that adjacent frames would be blent into each other? :( thats not good,would disqualify it from being usable with any kind of effects that involves shifting pixels each frame.
"clear digital 403x284 VIC output without any blurring distortions etc." will never happen... The VIC chip outputs a PAL-signal which inherently due to how PAL works WILL be blurred. I.e. chroma with half horizontal resolution than luma. To get a really clear image please try to exploit the bugs using only black and white. That would give you as much resolution as possible due to lack of chroma. |
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MagerValp
Registered: Dec 2001
Posts: 1074 |
Most capture devices "deinterlace" even progressive signals down to 25 fps, either by blurring or by weaving. Some do proper 50 fps, but it tend to be undocumented, so it's a little hit and miss...
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Radiant
Registered: Sep 2004
Posts: 639 |
MagerValp: Can you mention a device that does 50 fps? I've been thinking about getting one. |
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JackAsser
Registered: Jun 2002
Posts: 2014 |
Quote: Most capture devices "deinterlace" even progressive signals down to 25 fps, either by blurring or by weaving. Some do proper 50 fps, but it tend to be undocumented, so it's a little hit and miss...
It's indeed hit and miss. However if the device de-interlaces using weaving and the SW don't compress the result too heavily there are some hopes left. It's quite simple to extract the odd / even raster lines from a weaved frame and simply stretch the two fields to double height. This will give you back the original 50 fps progressive stream.
A problem of course if a capture device without any intelligence simply assumes the progressive stream is interlaces is first field top or not. During removal of weaving you might get temporal problems. I.e. odd lines belonging to frame x and even lines belonging to frame x+1 but you mix them up. This you'll notice immediately of course and if the capture device behaves the same always, then simply reverse field order during the process. |
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assiduous
Account closed
Registered: Jun 2007
Posts: 343 |
one of the effects involves a peculiar sideborder colour logic so black & white output wouldnt be very useful as a fact :)
theres no need for a crystal clear output,just clear enough to allow to precisely count hires pixels and verify what colour they are. I will have to find out more about devices that enable true vid capturing 50FPS progressive. |
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assiduous
Account closed
Registered: Jun 2007
Posts: 343 |
i attempted several times with various search phrases on google but i was unable to find any tv card that allows to capture a 50 FPS progressive video stream. if anyone more experienced in this field knows of such device ( MagerValp? ) then please let me know. costs dont matter. |
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MagerValp
Registered: Dec 2001
Posts: 1074 |
"50 fps" video capture yields a few good hits, including:
http://www.epixinc.com/products/pixci_sv.htm
http://www.geovision.com.tw/english/product/GV-650.htm
They don't come cheap though...
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Radiant
Registered: Sep 2004
Posts: 639 |
This thread might be interesting. I don't think those expensive cards are necessary (they seem to be aimed at a different target audience altogether).
The question is then, which cards can capture an interlaced stream without deinterlacing it? |
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