Weird idea for getting 23.97 fps

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Postby Zarxrax » Wed Oct 02, 2002 2:13 pm

Ok, now if the timecode effects things like that, then what does the frames/samples setting do? Cause you aren't selecting a timebase with it.

Also can someone show me a specific example of where the timing can get messed up? Cause I've really never seen anything like that happen.
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Postby ErMaC » Wed Oct 02, 2002 2:14 pm

I experienced them first hand while working on Lord's Prayer.
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Postby trythil » Wed Oct 02, 2002 4:54 pm

Zarxrax wrote:Ok, now if the timecode effects things like that, then what does the frames/samples setting do? Cause you aren't selecting a timebase with it.


If you select that option, Premiere will calculate edit positions using video frames or audio samples, not by using timecodes. I think that's what Premiere will do, anyway; I know Cinelerra can operate on that principle, and I'm assuming that it works in a similar fashion.

You're probably going to be asking "so why the hell do we have timebases anyway?" I can't really answer this as I don't work in broadcast video, but I'm willing to bet that the reason has to do with broadcast video standards, such as NTSC and PAL, where duration is not considered in terms of individual frames but in hours:minutes:seconds:frames. That last component is where things start to get finicky, because of interlacing and all that fun stuff.

NTSC, for example, defines 60000/1001 fields/second as the "frames" component, which is 30000/1001 frames/second. If you try to record, say, exactly 30 minutes of material from an NTSC source, you'll have actually recorded 30 minutes and 1.001 frames of material. (I think.) Therefore you always work with integer numbers for frame-count; hence, Premiere includes these timebases to facilitate production of such video.

Watch me be totally wrong. At least it sounds like I know WTF I'm talking about.
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Postby trythil » Wed Oct 02, 2002 4:56 pm

trythil wrote:NTSC, for example, defines 60000/1001 fields/second as the "frames" component, which is 30000/1001 frames/second. If you try to record, say, exactly 30 minutes of material from an NTSC source, you'll have actually recorded 30 minutes and 1.001 frames of material. (I think.) Therefore you always work with integer numbers for frame-count; hence, Premiere includes these timebases to facilitate production of such video.


That should be "Therefore you cannot always work with integer numbers for frame-count." Bah.
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Postby Zarxrax » Wed Oct 02, 2002 5:37 pm

Hmmm... so if I'm understanding this right... if I select frames for the timebase, then... it wont get out of sync or anything?
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Postby klinky » Wed Oct 02, 2002 7:02 pm

Frames/Samples does nothing because it's under Time Display, this just tells you where you're at in the video but doesn't play any bigger role.

Image

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Postby Zarxrax » Wed Oct 02, 2002 9:09 pm

Ok I believe I understand now :idea:
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Postby Nightowl » Thu Oct 03, 2002 5:10 am

I really should say something in this topic... nah.

-N
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Postby RadicalEd0 » Sat Oct 12, 2002 7:42 pm

I have come to ressurect this thread :O
anyhow, AD and/or Ermac. You explained the need to change the video from 23.976 to 24 and audio from 23976 to 24000 for premiere edit>export and then change back to 23.976 and 23976 for the final product. BUT you never said how to get from 23.976>24>23.976. Would assumefps() be best, since that dosent add or drop frames but speeds the video up and down respectively, or will this cause your video to be differently synched than in premiere? Is changefps() best because it adds/cuts frames but does not affect time? hmm.. so, which is it :/
NMEAMV: PENIS
NMEAMV: IN
NMEAMV: YO
NMEAMV: MIXED
NMEAMV: DRINK
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Postby RadicalEd0 » Sat Oct 12, 2002 8:03 pm

ahh.. well disreguard, ermac answered that in another thread. Teh search button is your friend :wink:
NMEAMV: PENIS
NMEAMV: IN
NMEAMV: YO
NMEAMV: MIXED
NMEAMV: DRINK
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Postby ErMaC » Sun Oct 13, 2002 2:31 am

Nightowl - if you are still reading this thread I would like your input as I know you've more experience when it comes to this kind of thing since you do it professionally.
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