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POST issue. 25 - 24p


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#1 SDC

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Posted 30 May 2006 - 12:50 AM

Hello.
I have some questions relating to shooting a doco with the HVX. Here in Australia it records 1080 25p - not 24 p which I believe is a NTSC/PAL differential(its called HVX202). I was hoping to have a master at 24p which would give me a good base to go to either 25 fames or 30 frames in the future( for different outputs, TV, NTSC countries etc) Also if we have to do a film run out for a festival showing then it will already be at 24 and we will have 16mm footage to bring in as well.
So if my master is now at 25 frame base, what am I losing if I do a down convert to 24 frames? Wolf Creek in Australia was apparently shot at 25p on the F900 and converted in this way to 24 and I have read snippets about indie/doco filmakers using this process tho I cant say I understand whats involved nor can I find much infomation on how its done. I know why it was done because previously you couldnt achieve 24p capturing on prosumer models until the HVX came out which doesnt help me as prev stated.

Will this process be detrimental to certain types of film footage, what will the implications be for audio in this conversion. I will be cutting on a G5 system using FCP. Does any one know if you can go to 24 from 25 in FCP using a pull down? I dont have the current FCP 5.04 version yet. In terms of getting a capture card is the standard apple cards ok for HD or should I get an external card. Someone mentioned the Kona

Another issue I have is with the amount of footage I am to be handling in this Doco which will end up being around a 50 min length. At 1080 25p that is around 100Mbps. Will my G5 start gasping? I was wondering if I shouldnt transcode the media to a lower sd res and in effect do a true offline. Im not sure how that would work with the P2 media? does anyone have any ideas or tried it? Or will a dual processor G5 handle it ok?

Sorry - so many questions!!

My head hurts. Any notes gr8ly app.

SDC> :ph34r:
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#2 peter orland

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Posted 30 May 2006 - 05:33 PM

Hi. Here is a link to Lemac's site, there is some stuff on the pros and cons of 25p v 24p in a Pal country.

http://www.lemac.com...TS/SHOOTHD.html

EXTRACT:

THE AUSTRALIAN RECOMMENDATION FOR PROGRESSIVE SCAN VIDEO ACQUISITION OR POST

If you want to shoot Progressive Scan in Australia then 25p is the answer - Why?

1. Easy down conversion back into standard definition 625PAL for off line on all available existing PAL NLE and Linear editing equipment.

2. 25 frame timecode integration into post - for off line on all available existing PAL NLE and Linear editing equipment.

3. No problems with flicker from lamps.

4. No problem shooting PAL TV screens.

5. 24p can be created by just slowing the 25p master down 4.1666% (audio will be effected).


As far as the G5 handling the footage, you should have no problems with the processor handling the DVC PRO HD codec at that rate, as long as you have sufficient ram and decent 7200rpm hard drives.

Edited by peter orland, 30 May 2006 - 05:34 PM.

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#3 Landis Tanaka

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Posted 03 June 2006 - 07:23 PM

Wouldn't 25p be better? It would be barley distinguishable from 24p but if anything wouldn't it be slower?
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#4 SDC

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Posted 04 June 2006 - 08:23 AM

Hi. Here is a link to Lemac's site, there is some stuff on the pros and cons of 25p v 24p in a Pal country.

http://www.lemac.com...TS/SHOOTHD.html

Thanks Peter, for the info. Its all out there, sometimes just hard to find.

The reason I wanted a 24 frame master is because it is a better base to go from to other formats, like a film print out or to 30 frame rate country. But I soldier on and work with this.

SDC>
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#5 Brian Drysdale

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Posted 04 June 2006 - 08:54 AM

It's common to shoot short films at 25 fps in PAL countries because most of the post production is set up for 25 fps. The only feature film people usually shoot 24 fps in the PAL countries.

You really need to discuss the whole post production workflow with the people involved if you intent to shoot 24P in a PAL country, otherwise you can find yourself with big problems. You should do tests before you start the production.
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