stuttering - there is no quality assurance architected into qc to
ensure a constant frame-rate. it attempts to render the next frame as
quickly as possible, and its basically a race against time to complete
that before the next refresh of your screen comes around requiring it.
as its competing with the system and other applications to do that,
sometimes it might not quite get there in time. which is when you see
the glitch. ironically, it becomes more noticeable on better hardware
with simpler comps, where things are so nearly perfect the glitches
stand out more. so in short, the answer is no unless you pre-render to
some degree, at which point you're writing a rendering engine around
the qc framework which goes beyond the developer examples. this is a
subject close to my heart, and forms a key part of something i'll be
working on as my next project*.
text scrollers - writing your own text scroller from scratch is a good
learning exercise, i'd recommend it. if you need to change the
scrolling text while something is scrolling, that is definitely more
of a challenge, if you download vidvox's vdmx application, last time i
checked they had a text scroller bundled with it that would bear
investigation on that front.
*anybody out there worked on an ahead-of-time render engine already or
used qc in a broadcast framerate assured environment? let me know,
there might be some consultation or a commission in it.
On 7 Mar 2008, at 14:45, Freyr Vidar wrote:
I love QC, but I'm having various beginner issues with a text
scroller largely
built on the WWDC QCTV demo from Apple.
The text briefly stutters ever so slightly on occasion. Is there a
way to
smooth this out and remove the stuttering?
What would be the best way to allow for arbitrary text lengths on
the scroller?
The present version of QCTV has fixed text lengths that change
before the
entire text has scrolled past.
Is the WWDC example the reference implementation of a text
scroller / newsticker?
I'm running this on a current generation Mac mini 2.0GHz and a MacBook
Pro 2.4GHz (the recently obsolete one... ;).
Also, back in January someone named Ben Cheney posted an interesting
thread
about the best way to create a digital display with a scroller:
http://lists.apple.com/archives/Quartzcomposer-dev/2008/Jan/msg00163.html
The list archives spamprotect all email messages, so I haven't been
able to contact him directly. Would anyone mind sending me his email
address in private?
Best regards,
Søren
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