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Help with.. green borders on videos

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First post, by theelf

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Hi, greetings, really i dont know how to descrive my problem, and maybe someone knows a solution...

I have a terrible for eyes green background when i reproduce videos in my 486, CL5424. This *ONLY* happen with 8bits palettized videos, for example, RAW AVI, or CRAM AVI (MS Video 1), not happen in 16bits videos like Cinepak when graphics card do the 24>8 conversion on the fly

The video resolutions are 320x200 or 320x240, happen the same, and worst if video is widescreen, and i do 320x168 for example, when green is much more visible

Any ideas guys? because this 8bits videos, 320x240, 12fps, MS Video 1, looks AMAZING in my 486, but ruined because of this

Software i tested same result: quickview pro dos, display dos, vfw on win31, it seems is hardware related no software

thanks

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Reply 2 of 4, by Gmlb256

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Those are the overscan borders and in 8-bit video modes they get affected when the color palette is modified. Looks more like a software and/or driver problem, where the developers didn't take account of it.

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Reply 3 of 4, by BitWrangler

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I remember that as somewhat "normal" on CL cards back in the day ... maybe alternative drivers give different results.

Unicorn herding operations are proceeding, but all the totes of hens teeth and barrels of rocking horse poop give them plenty of hiding spots.

Reply 4 of 4, by theelf

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BitWrangler wrote on 2023-06-02, 01:47:

I remember that as somewhat "normal" on CL cards back in the day ... maybe alternative drivers give different results.

Gmlb256 wrote on 2023-06-01, 23:13:

Those are the overscan borders and in 8-bit video modes they get affected when the color palette is modified. Looks more like a software and/or driver problem, where the developers didn't take account of it.

Thanks! yes, i was thiking about overscan, but finally i realize is a problem?¿ of cirrus logic and palettized videos. For some reason if color 256 of palette is 0 255 0, the CL card make a border around video, no idea why, but i tested same video on trident and S3 cards and not have the problem. But i tested a ISA CL 5422 and same problem

I decide to make a custom palette with ffmpeg, and the last color, a black 0 0 0

Sadly with old compression software i think is not possible to manually do palettes, for example, i was using vidcap to make first avi, but ffmpeg solve the problem

Now everything is perfect, thanks a lot

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