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@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