Doom9's Forum - View Single Post - ffdshow tryouts project: Discussion & Development

thewebchat · 19th September 2009, 17:29

VSFilter process:

1) Get subtitles
2) Create subpicture that is 64x the resolution of the video frame
3) Scale subtitle sizes using some magic numbers
4) Multiply everything by 8
5) Get outlines and composite (note that there is no ClearType going on here)
6) Downscale to video resolution and paint

Note that the combination of 2 and 4 is the reason that VSFilter supports 8th-pel subpixel positioning and sizes.

19th September 2009, 17:29	#8080 \| Link
thewebchat Advanced Blogging Join Date: May 2009 Posts: 480	VSFilter process: 1) Get subtitles 2) Create subpicture that is 64x the resolution of the video frame 3) Scale subtitle sizes using some magic numbers 4) Multiply everything by 8 5) Get outlines and composite (note that there is no ClearType going on here) 6) Downscale to video resolution and paint Note that the combination of 2 and 4 is the reason that VSFilter supports 8th-pel subpixel positioning and sizes.