Posted: 3/13/2012 8:27 PM
Post subject: PSXjin: video off by one
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natt
Editor, Emulator Coder, Site Developer
Joined: 5/11/2011
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Location: Murka
Top = printscreen from emulator (correct) Bottom = internal screenshot function output (incorrect) comparison video (lossless rgb x264) http://www.mediafire.com/?0bgdrnxowqihizu Error also occurs on all video dumps (not just internal screenshot function). ...
Posted: 3/13/2012 10:54 PM
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FractalFusion
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Glitchy TAS of 2013 Gameboy TAS of 2013 PSX TASer of 2010
Maybe it's just me, but I don't see a difference between the two screenshots other than that the top one has interface stuff on it. Besides, I don't think an off-by-one video dump is anything to worry about, if I understand correctly what you mean by off-by-one (I assume that means all the frames are consistently off by one).
Posted: 3/13/2012 10:59 PM
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Noxxa
They/Them
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Exotic platforms TASer of 2018 Exotic platforms TAS of 2018 Exotic platforms TASer of 2017 Exotic platforms TAS of 2017 Exotic platforms TAS of 2017 Exotic platforms TASer of 2016 Exotic platforms TAS of 2016 Gameboy TASer of 2013
The screenshot is shifted one pixel to the right compared to the print screen. Other than that (and the interface), the two shots appear to be identical (of the same frame).
http://www.youtube.com/Noxxa <dwangoAC> This is a TAS (...). Not suitable for all audiences. May cause undesirable side-effects. May contain emulator abuse. Emulator may be abusive. This product contains glitches known to the state of California to cause egg defects. <Masterjun> I'm just a guy arranging bits in a sequence which could potentially amuse other people looking at these bits <adelikat> In Oregon Trail, I sacrificed my own family to save time. In Star trek, I killed helpless comrades in escape pods to save time. Here, I kill my allies to save time. I think I need help.
Posted: 3/13/2012 11:11 PM
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natt
Editor, Emulator Coder, Site Developer
Joined: 5/11/2011
Posts: 1108
Location: Murka
FractalFusion wrote:
Maybe it's just me, but I don't see a difference between the two screenshots other than that the top one has interface stuff on it. Besides, I don't think an off-by-one video dump is anything to worry about, if I understand correctly what you mean by off-by-one (I assume that means all the frames are consistently off by one).
What I'm meaning by "off by one", is that the screenshot (taken with the F12) key has everything shifted to the right one pixel. Video dumps are also like this. Watch the comparison video, it makes it pretty clear. Edit: Yes, it is the exact same frame, there's no issue there. If you shift over one pixel and then use AviSynth Subtract(), the two look exactly the same (except for the one pixel border on the right that's gone missing)
Posted: 3/14/2012 2:34 AM
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zeromus
Editor, Emulator Coder
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Posts: 1156
fixed in r718. an inexplicable error in the pngout (later copied to the aviout) code would cause a rounding error which only manifested on the first column and would result in the first (leftmost) column appearing twice in the output (and the rightmost column being left out)