[QLab] video crossfade

[luckydave]

Your problem is most likely with DV files. That's a good bit of
compression, which needs to be decompressed in real time, and that can
cause hiccups in QLab. Try using an Animation (if you have an alpha
channel) or Photo JPEG codec. PJPEG is my favorite, it gives you
relatively small files which QLab has no trouble with.

As for resolution, it depends on what your needs are in regard to
clarity. If you need every detail exact, you'll want to make
full-screen movies. Those have lots of information and are big files.
If you're not worried about a little loss in quality - which usually
isn't that bad - consider going to a half-screen resolution. For
instance, if you're using a 1024x768 resolution for your display, try
making a 512x384 video, and telling QLab to make it a resizable window
with a size of 1024x768. OpenGL stretches it, and it usually looks
pretty good. It'll keep file size down, so you'll see less hiccups.
Also it gives QLab fewer pixels to digest when it's working out your
crossfade.

hth,
luckydave

--- Paal T Nygaard <ptn at bgnett.no> wrote:

> Hi!
> 
> I have also had kind of very poor results when crossfading video. 
> Tried with all kinds of Mac laptops, none could do it well enough.
> Had to rent a big fat Mac from a video company to be able to 
> crossfade two DV QT files with close to good enough results. I find 
> this a bit strange..?:-)
> This Mac had dual Xenon processors, the bigest VGA card you can buy 
> for a Mac, 4 gigs of ram, fastest possible internal harddisks...
> 
> Adobe Premiere can crossfade perfectly the same files, in realtime 
> without pre-rendering, even with a few colour plugins, zoom in etc. 
> And this on a standard Intel pent 4 3 ghz PC with a rather old 
> vga-card, Nvidia FX 5600.  On an Intel Core 2 Duo with newer Nvidia 
> card, even more plugs can be added.
> I can say for sure that both these PCs only have a fraction of the 
> power that the rented video Mac had.
> 
> Would be nice to have some info from a Mac-geek on what could be 
> causing his poor vide cossfades, and also what could be done about
> it.
> 
> For a start: What would be the easiest codec, resolution and 
> fileformat to use for video? Any hardware accellerators to buy? 
> Possible to write  better videoplayback and fade module for Qlab?
> 
> Cheers,
> 
> Paal
> 
> 
> 
> 
> 
> At 23:11 01.11.2007, you wrote:
> >The mini's have a GPU, but it's integrated and shares the ram with
> the
> >rest of the system.  Do not expect to fade between anything higher
> >than two 480p movies.  I have tested this on both my core duo and
> core
> >2 duo mini's.
> >
> >~Noah
> >
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