Re: Displaying a stream of images using GTK

["alok nagdev" <aloknag hotmail com>]

Hi Vladis,

> From: Valdis Kletnieks vt edu
> To: alok nagdev <aloknag hotmail com>
> CC: gtk-list gnome org
> Subject: Re: Displaying a stream of images using GTK Date: Thu, 28 Jul 2005 
> 17:53:30 -0400
>
> The single biggest question is "Do you have enough memory or a small enough
> video clip that it fits in RAM easily?".  If not, you'll need to do some 
> sort
> of pre-buffering and/or readahead from disk (think threads here....)
>
> The second question is "Do you need to be able to start displaying the 
> instant
> Frame 1 shows up, or are you allowed some amount of pre-buffering"?  (If 
> you're
> allowed to run 5-6 frames behind, your timing constraints get a *lot* 
> easier.. ;)
>
> The third question is "How do you define 'fastest way'?".  I've had to deal
> with applications that had inbound data at around 30fps, but had to 
> actually
> output 96fps (stereo 48fps for a VR system), and handling the stereo, the 
> 3D
> imaging, interpolating from 30 to 48fps, and a lot of really messy 
> mathematical
> modelling, and suddenly the time budget gets *really* tight.  I've had to 
> deal
> with applications where "30fps is good enough, but we need a 
> minimum-CPU-usage
> solution because other things are going on".  And then there's always the
> question of "how much trouble are you in if you drop a frame on the floor" 
> (a
> fatal error for broadcast TV, a nuisance if you're just playing a DVD for
> yourself...).

Clips are quite big and so they would not fit in RAM. I dont need to be able 
to start displaying instantly, so a lag of a couple of frames should not be 
a problem. By fastest I meant that although I'm okay with dropping a couple 
of frames for timing constraints but the least frames I drop works better 
for me and in the meanwhile gives me more time for image processing stuff, 
which I'm thinking of avoiding implementing before I get the display thing 
to work. In that sense I agree on having something like minimum CPU usage 
solution.

Alok

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