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面麻 发表于 2016-4-8 21:25
It's pretty grateful of you to offer me these references.
After learning about basic conception of t ...
Well, I do agree with you about the difficulty of tcas, since it exposes more details to the FXer, and the built-in (ease of use) PIX APIs are far to be rich (compared to ASS tags). Another point is that API is harder to use than tags. :)
At the very beginning, I designed the TCAS format just to be a supplement of ASS for handling Pix Effects (Using ASS to output often resulted in huge files, and slow to preview.). But after I finishing the specification of TCAS I found that ASS and TCAS are actually two different major approaches to subtitle effects (Both of them have the full ability of making a complete subtitle effects), one represents vectorial system, and the other for bitmap system. They protogenetically have their own strong and weak aspects. e.g.
Vectorial System is good at resizing, rotation, transformation, etc.
Bitmap System is good at texturing, masking, coloring, etc.
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