Thread: Blackmagic URSA 23.98 or 24FPS

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  1. #11  
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    The option of shooting 24fps vs. 23.976 under artificial lighting can create strobing artifacts. More the often, to be on the safe side, you should shoot at 24fps with a 180 degree angle. This setting pretty much gives a strobe or flicker free footage at the right exposure. But when you shoot under the same artificial lighting at 23.976, you need to use shutter angles that are safe for 23.976fps and the frequency of your lighting environment. For example, a safe 23.976fps setup under 60hz artificial illumination, one should use one of this shutter angle setting (138, 207, 276) and not 180 unless you're going for some creative look. Otherwise there will be some flickering or visible strobing. Here's a good reference calculator: http://www.red.com/tools/flicker-free-video
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  2. #12  
    BluRay and hopefully digital projection.

    Quote Originally Posted by headache62 View Post
    What are you delivering to?
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  3. #13  
    Ok cool. Thanks for that.

    Quote Originally Posted by EYu View Post
    The option of shooting 24fps vs. 23.976 under artificial lighting can create strobing artifacts. More the often, to be on the safe side, you should shoot at 24fps with a 180 degree angle. This setting pretty much gives a strobe or flicker free footage at the right exposure. But when you shoot under the same artificial lighting at 23.976, you need to use shutter angles that are safe for 23.976fps and the frequency of your lighting environment. For example, a safe 23.976fps setup under 60hz artificial illumination, one should use one of this shutter angle setting (138, 207, 276) and not 180 unless you're going for some creative look. Otherwise there will be some flickering or visible strobing. Here's a good reference calculator: http://www.red.com/tools/flicker-free-video
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  4. #14  
    Senior Member Frank Glencairn's Avatar
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    Quote Originally Posted by jefferypeterson View Post
    It's been a while since I asked this question. I've always shot 23.98 but now feel like I should use 24. I don't know why? What is everyone else using?
    25, but I live in a PAL country
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  5. #15  
    Thanks.

    Quote Originally Posted by Frank Glencairn View Post
    25, but I live in a PAL country
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  6. #16  
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    I always shoot at 24p. You can always deliver at 23.976 even if you shoot at 24.

    Today all post software can ingest anything 24 or 23.976 or any other frame rate. 24 will keep you out of trouble. It will give you nice multiples for slowmo 48, 60, 120.

    Also sound is 48000Hz, multiple of 24. If you shoot some 24, some 23.976, and have all audio at 48khz you're asking for trouble.
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  7. #17  
    Thanks. That's what I'll be using from now on.



    Quote Originally Posted by townio View Post
    I always shoot at 24p. You can always deliver at 23.976 even if you shoot at 24.

    Today all post software can ingest anything 24 or 23.976 or any other frame rate. 24 will keep you out of trouble. It will give you nice multiples for slowmo 48, 60, 120.

    Also sound is 48000Hz, multiple of 24. If you shoot some 24, some 23.976, and have all audio at 48khz you're asking for trouble.
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  8. #18  
    Quote Originally Posted by townio View Post
    Also sound is 48000Hz, multiple of 24. If you shoot some 24, some 23.976, and have all audio at 48khz you're asking for trouble.
    To be clear, audio has a TC base and a sampling rate. In 2018 we record everything at 48kHz but the TC Base will change to 23.976 or 24.000 depending on what the post-supervisor wants. We only ever used to do those wacky off-speed sampling rates (48048Hz and 47952Hz) during the film days when re-sampling wasn't as good. So don't worry! Regardless of your frame rate, always record in 48kHz.
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