Combining 1080i and 1080p HDV footage on single timeline, for SD output?

Hi All
Help! I'm a cameraperson/director who was has just shot a largeish doccie project on a Sony HVR-V1E. My technical background is in stills, so I hope you'll forgive some ignorance here.
BACKGROUND: The vast majority of the footage was shot HDV using the 25fps prog scan mode on the camera. I really don't like interlace jaggies and I was advised that this was the obvious way of getting away from them, and made for very useable footage when output as standard def interlaced PAL. However, some footage for the project was also shot on a small Sony HDR-HC9 (PAL) camera. The HC9 has no progressive scan mode, i.e. this footage is 1080i50.
The primary broadcaster for this doccie requires delivery on Beta SP, standard def PAL. Because of the 16:9 aspect ratio of the HDV format, the film will be delivered letterboxed, black above and below.
THE MAIN QUESTION: We'll be editing in FCP 6.0 . My editor is more of an Avid person, and is concerned that without proper setup we'l end up with issues later on when we downsize to SD, especially because we'll be combining prog-scanned footage with interlace-scanned footage. We need to know whether to set the sequence presets as HDV 1080i50 or HDV 1080p25.
We're planning to edit as an HDV project and downscale to SD using Compressor. I know this downscaling is likely to take a long time, however we've been advised that editing in HDV is less intensive than going the ProRes route, and the quality of the Compressor downscale is better than that of the other 'within FCP' options.
I've been advised to set the sequence preset to i50, but I'm not sure if Compressor has a harder time resizing interlaced footage than progressive footage. Common sense tell me it'll be easier to resize a progressive frame and then split it into two interlaced fields without artifacts, than resizing and regenerating interlaced fields from 1080 down to PAL dimensions. However, if the sequence preset is p25, will FCP deal with the bits of i50 footage in the project OK?
Also, I've been told but cannot confirm that the Sony HVR-V1E camera scans progressively in 25fps prog scan mode, but encodes each progressively-scanned image as two interlaced fields on the tape, i.e. as 1080i50 images. Is this true? If so, it would surely mean that the sequence preset should be 1080i50 with progressive-scanned imagery emanating from this model of camera.
I hope this makes sense!
Regards
Adam Welz, Cape Town

Hi,
FCP is open format timeline based, so it will transcode the footage according to the first clip on the timeline. so it will not be a problem for two different formats. i've used DVCAM, HDV formats together it has done for me nicely.
but check the result before proceding further ahed in edit in both preset format.
and using Compressor is not a good idea for broadcast I believe, it is ok if there is no other option is with you. It is better to do it with the hardware rather than software.
I use realtime Blackmagic hardware for down converting HD to SD with letterbox directly to tape.

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Combining 1080i and 1080p HDV footage on single timeline, for SD output?

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