VLC 0.4.0 release

Samuel Hocevar sam at zoy.org
Sun May 19 11:16:02 CEST 2002

On Sun, May 19, 2002, Tony Castley wrote:

> I have had a look at pitch now with a GeForce card, I can get small 
> movies ie <400px width to work fine.  However DVD movies don't.  What 
> are the margin, hidden and visible_bytes for?

   margin should be set to 1 if the physical picture is bigger than the
visible area. visible_bytes is the visible picture width, and hidden
should be set to 1 if the "non-visible" part of the picture can be
safely written to.

   For instance, if you have a 250 pixel-wide picture, and the operating
system pads lines to multiples of 16, it'll allocate a 256 pixel-wide
area, and you'll have the following values:

    i_pitch = 256
    b_margin = 1
    b_hidden = 1
    i_visible_bytes = 250

   Please not however that, as stated in the BUGS file, most chroma
transformation routines completely ignore margins, which may lead to
unexpected results.


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