Distorted when projected - why?

I recently made a short film, and it played fine in Quicktime on my iMac.  When it was video projected at a film night however the image was distorted - it had horizontal lines running through it and the projector seemed to struggle with blocks of colour.  This was a domestic level projector, and the film was running off a MacBook Pro.
I am intending to show it again at a festival and would like to know what I can do to render it best for projection.
My current export settings are:
Format: Quicktime
Preset: PAL DV
Output: 720 x 576  25 fps, lower, quality 100
Video codec: DV25 PAL
No frame blending
Maximum render quality
Thanks for any advice

Well unfortunately the output mode and player would have decided this. The lines are likely from interpolation which means the player was dealing with the material as Interlaced or the player was outputting Interlaced and the Projector was displaying in Progressive. You can also get that from Interpolating 25 frames to 30 frames if the Player is playing everything in NTSC and your material is in PAL. Often times differences in Codecs will cause that to not interpolate correctly in the player.
Eric
ADK

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