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Some questions related to score video generation

From: Knut Petersen
Subject: Some questions related to score video generation
Date: Fri, 7 Jul 2017 09:55:38 +0200
User-agent: Mozilla/5.0 (X11; Linux x86_64; rv:52.0) Gecko/20100101 Thunderbird/52.2.0

Hi everybody!

I extended my video generation script to allow coloring notes as they are 
Currently that works for noteheads and rests, see this example I uploaded to youtube 

Question 1: I use an after-line-breaking override for NoteHead, Rest and 
events to encode the moment and the duration in the color fields of the notehead
grobs, translate to postscript and postprocess the postscript files to tell 
to generate images for every moment that has one of those events. Does anybody
know a less hackish way to generate  multiple copies of the systems of a score
with changes to only the color of some grobs?

Question 2: I also would like to change the color of the stems, flags and dots 
belong to a notehead, but those have no 'duration. Does anybody have an idea
how to give a certain color to those grobs from inside the code called by the
notehead after-line-breaking override?


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