[PD] problems with Intel MacMini playing video

chris clepper cgclepper at gmail.com
Wed Jun 27 16:20:28 CEST 2007


Does it stutter at the end of the clip while going back to the start?

Do you have any audio in the clips?

What is the GEM compile date?

On 6/27/07, simon wise <simonxwise at hotmail.com> wrote:
>
>
> On 27 Jun 2007, at 1:27 AM, chris clepper wrote:
>
> > What type of video files and at what size?  How many clips are
> > playing on one machine at the same time?  What is the display
> > resolution?  The Intel graphics have some problems above usual
> > desktop sizes and shader performance is really horrible too.
>
> I'm using pix_movie to play .dv movies by asking for each frame in
> turn, so that I can scrub, pause etc with all machines in sync. It
> works well, except for the intermittent series of hesitations I
> assume are either dropped or late frames.
>
> To debug this I switched to using a single machine, no network
> connections and tested using [auto 1( instead of frame-by-frame -
> only 1 clip playing in this simple setup. Then tried different codecs
> - H264, PhotoJPEG each 576x720 and 1024x768. The MacMini is connected
> to the 1024x768 projector via a short DVI cable. The GEM window is
> set to fullscreen, frame rate 25.
>
> There was a slight improvement with the H264 at 576x720 but the problem
> was still there. Quicktime could play all the movies at fullscreen
> smoothly.
>
> I have some other MacMinis - PPC and intel - coming soon so I'll test
> these and try higher framerates for GEM. The Intel ones have just
> been used with Isadora in a similar way and apparently had the same
> issue. The hesitation is only very noticeable on video with fast
> moving, high contrast scenes - but it is obvious then.
>
> Pity about the shader performance - I was planning to use Minis for a
> more complex setup with masks and some colour correction but I guess
> I'll need to go with bigger boxes and better graphics cards (probably
> similar $$), or try to find some old G4 Minis.
>
> Simon
>
>
>
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