Add new header to make blur tag scaling independent of original video resolution

[GoogleCodeExporter]

Currently the scaling of the \blur tag depends on the original video 
resolution. This is due to a historic accident, and there is nothing else that 
depends on the video resolution at all (as long as aspect isn't different from 
script resolution).

Please add a new header that makes \blur scale independent from original video 
resolution like everything else. (It really should be the default behavior, but 
unfortunately this is not possible if backward compatibility is valued over 
correctness.)

I suggest calling the header "CorrectBlurScaling: yes". This is similar to 
"ScaledBorderAndShadow: yes".

Original issue reported on code.google.com by nfxjfg@googlemail.com on 28 Jun 2013 at 4:50

[GoogleCodeExporter]

Coordinate based tags and font size also depend on the original video 
resolution.

If a change such as this is desired, continue the discussion on the Libass 
issue tracker for a header which can specify PlayRes-only layout & scaling. It 
shouldn't stop half-way with only changing the behavior of blur tags:

http://code.google.com/p/libass/issues/detail?id=102

Original comment by cyber.sp...@gmail.com on 29 Jun 2013 at 1:46

• Changed state: Done

[GoogleCodeExporter]

But this solution is much simpler than #102, could be implemented without much 
trouble, and actually solves the resolution dependence problem.

Please reconsider.

Original comment by nfxjfg@googlemail.com on 29 Jun 2013 at 12:38

[GoogleCodeExporter]

PS: #102 doesn't seem to go ANYWHERE.

Original comment by nfxjfg@googlemail.com on 29 Jun 2013 at 12:38

[GoogleCodeExporter]

Last thing I know, I relayed cyber's proposal for a tag structure into #102, 
and no reaction of any kind followed...  I originally blamed this on the break 
from this issue to calm down, but I guess that means I was wrong...

Original comment by TheDarkS...@gmail.com on 29 Jun 2013 at 12:44