Outlines are different with VSFilter

[pingplug]

PlayResX and PlayResY are 848 and 480, rendered on 1280 x 720 video

Style: Default,Arial,31,&H00FFFFFF,&H00000000,&H00000000,&H00000000,-1,0,0,0,100,100,0,0,1,3,0,2,30,30,15,1
Dialogue: 0,0:00:00.00,1:00:00.00,Default,NTP,0000,0000,0000,,This is a test
Dialogue: 0,0:00:00.00,1:00:00.00,Default,NTP,0000,0000,0000,,This is a test

this is for libass

this is for VSFilter

2015-01-03 update

1. the outlines are different(3px in VSFilter, 4.5px in libass)
   I think this is caused by the default ScaledBorderAndShow(1 in libass, 0 in VSFilter)
2. VSFilter add borders(top/bottom, = max border_y of the top/bottom line) between texts
   makes the collision text 6px(2 * 3px border) higher than libass

[CarVac]

It seems to be that in libass, the border widths aren't scaling with the rendering resolution.

Playing back 480p video stretched to fit my 4k screen, the borders are way too tiny: they stay the same size even as the subs themselves change size.

[grigorig]

It's actually the opposite. libass scales the borders with resolution by default, VSFilter does not.

[astiob]

Let’s split this into #287 for ScaledBorderAndShadow and #304 for the space between events during collision detection.