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print 35mm from interlaced material
Hello,
I’m going to grade a documentary (feature) shot in HDV, interlaced 50i (PAL). The film will have a 35mm print. What’s the best solution to output DPX ? I imagine I should desinterlace the video, but where ? How ? When (before ? after the grading).
All the best
Robin
réalisateur, scénariste, monteur
http://www.robinerard.ch -
4 Replies
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DPX files do not have fields, so if you export the 50i HDV footage to DPX the software should export the ‘frames’ to DPX at full raster and 25fps. This does not mean that you will not have some interlacing artifacts especially in pans, etc. After Effects, Shake, Digital Fusion, Combustion all have tools for doing the de-interlace and export to DPX and there are other tools to cleanup other problems with that kind of footage but that can get complicated and expensive. The 35mm Print will run at 24FPS so you will have to slow the audio down to match.
-Rob-
Robert Houllahan
Director / Colorist
Cinelab Inc.
http://www.cinelab.comMAHC-PRO 6-Core 3X GTX285 20Tb SAS Wave Panel Panny 11UK SDI Plasma.
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On the Config screen, project settings, there is a check box you can use for interlace processing. It will influence your real time playback node count. If you are not resizing, changing the resolution, using defocus or sharpen you may not need this checkbox for your interlace material. If you have just a few shots that need resizing, consider rendering those to DPX first with the checkbox enabled then complete the project with it disabled, i.e. normal mode.
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Hello,
Thank’s for your answers.
The film will be print in 25fps, we can print like this on the CINEVATOR and movie theater in Switzerland accept the 25fps for 35mm. PAL 50i or 25p is good for that, it’s just 1 frame more than 24.
If I well understood you : I should grade in interlace, output in DPX full frame (this DPX will contain both fields), and rerender in shake, after effect or combustion to output new De-interlace DPX ?
All the best
Robin
réalisateur, scénariste, monteur
http://www.robinerard.ch -
Hi there,
The good thing about shooting in 50i is you can create nice 50% slomos by de-interlacing and interpolating.
I suggest the following.
1. make an offline edit in 50i
2. do an online in Smoke or something that can load OFX plugins
3. apply the deinterlacing and speed changes in the online tool
4. Export to a folder structure in 25P DPX
5. Load that into Resolve and work in nice and clean frames.
6. Do all the scaling and paning in Resolve and Render
7. Collect the Output in Smoke and add sound.The trick is to find a good deinterlacing algorithm that not just duplicate the lines but has some clever interpolation.
Revision is my favorite one.
If you can get rid of the field on the edit/online level you are free to do all the SRT stuff while grading.Good luck 🙂
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