On Tue, Jan 29, 2013 at 08:22:33PM +0100, David Kastrup wrote:
> Adam Spiers <lilypond-u...@adamspiers.org> writes:
>
> > + a new default scrolling mode where the notation stay still
> > and the cursor line scrolls from left to right
>
> You jump the notation leftwards. You should rather _pull_ it left.
Yeah, this was my initial intention, since the video which lead to my
searching for something like ly2video and subsequent discovery of it
does already do this:
http://www.youtube.com/watch?v=YC5mfm2C-ZI
In fact, I even already have a git branch where I started the
implementation.
> Start with a pixel per frame, increase the speed by 1 pixel/frame/frame
> until you are half through, then decrease by 1 pixel/frame/frame. If
> this is not fast enough to keep the cursor on-screen, start earlier
> and/or faster. Ok, the metrics are certainly debatable: you probably
> want everything over in 0.5 seconds or less, and want to have this in
> two phases (possibly more): acceleration and deceleration.
Nice. I hadn't thought of doing it like that - I had only considered
a simple scroll with constant speed.
> But a mere discontinuous jump is confusing since it can happen when
> blinking.
Right, that's the obvious justification for the feature. I have two
minor concerns: firstly, whether the scrolling can happen smoothly
enough within < 0.5 seconds, especially at lower frame rates, and
secondly, whether there is a significant risk of the scrolling
coinciding with playback of a particularly detailed / interesting bit
of the music where it would be more satisfactory to keep the notation
motionless.
However, since you and I both had pretty much the same idea, I think
that's a good enough sign that it should be implemented; filed as:
https://github.com/aspiers/ly2video/issues/27
FYI, there's a related issue:
https://github.com/aspiers/ly2video/issues/22
Thanks!
Adam
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