[FFmpeg-devel] a64 encoder 7th round

Michael Niedermayer michaelni
Tue Jan 27 14:38:39 CET 2009

On Tue, Jan 27, 2009 at 08:05:05AM +0100, Bitbreaker/METALVOTZE wrote:
> > is there any reason not to use 5col mode?
> Yes, size (0xa00 vs. 0x600 bytes per frame @ a charset lifetime of 4 
> frames) and thus displayspeed :-)

why do you need so much space to store a single bit per char?
also if the chars take much space, why not simply reuse them from
the previous frame and just update some?

> As already mentioned about the other 
> modes i implemented as well, they all have their advantages and 
> disadvantages. There are just different ways on how to display graphics 
> on a c64. Some have more dynamic range, some have color, some have more 
> details, some use grayscale.
> Just imagine it is like displaying on a pc in gray8, rgb32, bgr24. 
> Though one format might be enough there are still more, for a good 
> reason :-)
> You might have a look at pages like this, that describes a few (there 
> are way more) graphic modes of the c64:
> http://www.studiostyle.sk/dmagic/gallery/gfxmodes.htm

from this i assume you use the 4color per block 160x200 mode, cant this
allow any 4 out of 5 colors, i mean not just the 4 darkest/4 lightest?
also i think your code should not downscale 320->160 but rather require
160x200 as input.


Michael     GnuPG fingerprint: 9FF2128B147EF6730BADF133611EC787040B0FAB

He who knows, does not speak. He who speaks, does not know. -- Lao Tsu
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