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#11
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Re: 24p - 23.976 fps video & 24 fps audio
I think the NTSC-compatibility thing is the the main reason they want to keep it at 23.976 for now (NTSC screenings, etc).
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Thanks Last edited by SZE; 08-31-2011 at 09:30 AM. Reason: Additional request for info |
#12
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Re: 24p - 23.976 fps video & 24 fps audio
Tape. HD Cam and HD Cam SR are 23.976. TV, Festivals, Distribution Deliverables......
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#13
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Re: 24p - 23.976 fps video & 24 fps audio
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Just wondering why force the whole chain to pull-down when only one segment (TV, DVD) needs NTSC picture. Wouldnīt it be easy to do a 24 to 29,97 transfer only for those future niche media? 24 to 29.97 has been done for decades why force the HD cameras to 23.98 now. Just wondering.
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#14
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Re: 24p - 23.976 fps video & 24 fps audio
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#15
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Re: 24p - 23.976 fps video & 24 fps audio
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The European films I have worked on have had 24, 25, and 23.976 versions.
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Tom Hambleton CAS Ministry of Fancy Noises IMDb Undertone on Facebook Undertone Custom Sound Libraries "Groupable markers would be epochal!" -Starcrash |
#16
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Re: 24p - 23.976 fps video & 24 fps audio
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If cameras shot at 24 dead and then played out on an NTSC system, they would have to drop the speed by 0.1% or do frame rate conversion by means other than 2:3. |
#17
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Re: 24p - 23.976 fps video & 24 fps audio
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What I meant was why not do the entire post at 24.00 and ONLY pull down the image for NTSC media (TV, DVD). Since BD, DCP, prints etc. all support true 24.00 why force the entire post-chain incl. camera-speed to 23.98 if only a small part (and even smaller in the future) of the release media can only play 29.97? Why "terrorise" everyone with pull-down confusion for a future niche product. Why not do the pull down at the end only for the media that needs pull-down? (Speaking strickly of theatrical film here)
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#18
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Re: 24p - 23.976 fps video & 24 fps audio
I guess it's down to simplifying it. Say you shot at 24 and then had to display on a screen only capable of 60i, as is the case with lots of older and low-end displays. The camera would either have to pull-down, or you'd have to put it in to an edit suite, pull-down and then export.
23.98 means it's close enough to 24P to pull-up if required, but for TV where it has to be compatible with old NTSC standards, 23.98 means you can deliver for HD and SD without having to do any conversions, and if everything is 23.98, it avoids confusion over what has been pulled-down and what has to be pulled-down. It would be nice if there was a clean start with HD running at 24 or 48, but then maintaining compatibility with SD systems unfortunately stops that. They could have done it with DVB and ATSC too, but that had to maintain compatibility with analogue sets. |
#19
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Re: 24p - 23.976 fps video & 24 fps audio
Thanks for all the replies.
We are starting with a trailer of the film, so a few days ago I received a QuickTime MJPEG 720p @ 23.976 fps. This was imported into a Pro Tools session also set to 23.976 fps, and when the OMF was imported into Pro Tools, everything sync up, so I presume the OMF is also 23.976? Now I have some more doubts and am still a bit confused about what is actually happening here. When I record my master in Pro Tools ready to pass on pic. editorial, the new audio files created show up in the Workspace as 48kHz files. Doesn't 48kHz equate to 24 fps, and shouldn't my new files be 47,952 files as my session is running at 23.976 fps? My principal concern is how my master audio is going to sync up / playback in FCP, as the film is being kept at 23.976 fps right up until deliverables / printmaster. What do I need to do to output a file for them that will sync up and will not be pulled up/down or messed about with in any way by FCP? Thanks |
#20
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Re: 24p - 23.976 fps video & 24 fps audio
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Again: In PT the TC ruler is only a counter. Nothing else. Unless you set the session setup to pull up/down it will run at 48k no matter what TC you chose. Like I said before: in the digital world sound speed it set by sample frequency not TC. If your film was shot at 23.98 and post is done at that speed and release format is also 23.98 you donīt need to pull anything up or down. You could even set your session to 25fps and everything will still play back in sync. only the TC in picture will not match PTīs TC ruler.
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