field rendering, workflow for DV PAL and rendering to 10bit for digi beta

[Jimmy Brunger]

I would personally render out all GFX as progressive (it looks more like film and you can get better stills off it), unless you have any awkward semi-fast scrolls, who’s ‘judder’ can sometimes be fixed by rendering with fields (if motion blur on progressive doesn’t work instead)

DVCAM is lower field first, but digibeta is, I believe UFF..I *think* you want to be rendering UFF if indeed you want your GFX fielded, but do a pass of both to be sure and check. We usually shoot on digibeta if it’s ending up on digibeta for playout, so I can’t remember, but I’m pretty sure you render out for the format you’re going TO rather than where it’s come FROM. If however you are diectly treating the DV footage itself in AE then you’ll need to render LFF, or de-interlace the footage first and render progressive.

*Production Studio Premium / *Combustion 3
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[Toby Heslop]

how do i deinterlace dvcam footage in afx?

also i have created a horizontal blue bar in AFX and put a piece of footage over the to of it with a sihlouette luma blend mode so there is white movements of footage within the blue bar. it looks right but when i render out as 10bit + alpha back in fcp on a dvpal timeline it seems as though the blended footage has an edge feather on it cause it does not frame all the way to the edge of the bar?

my friends told me to use this work flow:
edit DVcam footage in FCP, create GFX in AFX and render as 10bit, compile in FCP on a DVPAL timeline and then nest into a 10bit FCP timeline, that way the footage is still dv compression but the GFX would be uncompressed and the best they could be. is that how you would do it?

thanks

[Jimmy Brunger]

I don’t use FCP I’m afraid, so not sure on that one..try what your friend suggests and see if it works first!

If you need to de-interlace your footage slick on Adrew Kramer’s head at the top of the AE forum and search for his tutorial on de-interlacing.

All the best.

*Production Studio Premium / *Combustion 3
————————————-
Win XP Pro SP2 / Intel P4 3GHz / 2GB RAM / GeForce FX5200 / DeckLink Pro / Sony BVM-20G1E / DVS SDI Clipstation / 110GB boot/80GB media/600GB RAID-0

[Toby Heslop]

thanks for your wisedom mate,

peace

[Michiel]

DV is lower field first while Digibeta is upper field so yes you have to keep this in mind. Personally I would first cut the dv, simply export that as dv (without recompressing) from FCP, import that into AE and make sure it is interpreted as lower field first. Then do the graphics and composite in AE and render the whole thing out 10 bit upper field, ready to import into FCP and digi.

Personally I have had some bad experiences combining progressive graphics with interlaced video. If you want to do progressive graphics I’d try and deinterlace the video as well (although without using specialised plugins this will cost you in image quality)