VSFilter ASS {\clip(m... l...)} Problem, Textsub.vdf=Ok

[Liisachan]

Thank you for confirmation. I happened to notice it while using VSFilter. We should be able to use a subtitle that is on Frame 0 (the first frame), so Start Time must be inclusive. And if so, End Time must be exclusive, because if both were inclusive there would be a collision just because End Time = Next Start Time like this, which would be very confusing and not acceptable.
00:01.00,00:05.00 ... line 1
00:05.00,00:10.00 ... line 2

Originally Posted by jiifurusu

The problem is only really fixable by using true fractional framerates (nominator/denominator) and that could require some reworking of the software. I'm not sure if this is reasonably fixable...

True..... The similar problem may occur when you write 23.976, because (double) 23.976 is not equal to what is called 23.976.

I'm not a pro programmer but just a learner, so I can't give you any clear explanation, but experience shows: using (double) fps, or (double) ms_per_frame is not safe, and something like this is relatively safer and may be practical enough.
sub_start_frame = ceil( sub_start_time * dwRate / dwScale )

eqvinox: 1 ns is not really needed, but directx has 100ns resolution, so 100 ns might be a good idea so that you can always tell for sure which event is before and which is after.