Latest post Thu, Apr 24 2008 1:43 PM by jwrl. 6 replies.
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  • Thu, Apr 17 2008 11:40 AM

    • Roody
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    1080i Footage into a 24p Project?......

     Hello All...

    A little help here please if anyone can explain for me... a little new to editing so please excuse me if this sounds stupid to you....

    I am shooting on a Sony FX1-E Camera, which captures 1080i/50 footage (interlaced 25fps)

    I am working on Avid Media Composer.

    My Boss wants me to bring this footage into an Avid Project which is set up as a 24p (24fps Progressive) on the "Project type" settings box... he thinks it will give the film a more "film like" quality...

    Erm... again, sorry if i'm missing something here... but this seems wrong... bringing in 1080i 25fps footage into a 24p project?.... What if anything is this going to do to the footage... how/will it affect it?... maybe it wont do anything... maybe it'll mess the whole thing up?....

    Any/all advice appreciated....

     

  • Thu, Apr 17 2008 5:27 PM In reply to

    Re: 1080i Footage into a 24p Project?......

    Well, I can't speak to the 25 > 24 conversion in PAL land, but I'm sure one of our PAL experts can.

    You won't be able to open 25i in a 24p project, so that footage would have to be converted, but you are probably asking for problems.  If your boss wanted that 24p film look, why didn't they shoot 24p?


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  • Thu, Apr 17 2008 6:03 PM In reply to

    Re: 1080i Footage into a 24p Project?......

    A 24p project will NOT give your footage a film look. It will not. It will not modify your footage, a P-resolution only determines how footage is being stored.

    If you capture 25i from a deck into a 24p SD project, the frames are stored and played back as frames, rather than fields. Since you will then be working in 24p, the footage will also be slowed down on output to 24fps. Depending on the type of project settings, the audio will likely be out of sync, and if not, it will be a non-standard sample rate.

    The 24fps playback is done with a pulldown, so as soon as you go into playback, for half of every second the field order will be wrong, and your image will be ugly and stuttery. If you switch playback to 25fps in the film settings, the motion will be OK, but your sound is probably still messed up.

    As soon as you try to create a motion effect, you get all kinds of ugly results, because the software is treating entire frames, but it has actually combined two interlaced fields, which it doesn't know.

    So in short, it is not so much a bad idea, as it is completely insane.

    If you are talking about a 24p HD project, I don't think you will be able to capture a 1080/50i signal into a 1080/24p project, neither should you want to.

    Want a film look for your interlaced video? Open a 25i project, capture, apply a timewarp effect to your footage at 100% with input set to interlaced and output set to progressive. There it is.

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  • Fri, Apr 18 2008 9:37 AM In reply to

    • Roody
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    Re: 1080i Footage into a 24p Project?......

     Many thanks for that... I will give that a test.

    Kindest Regards

  • Tue, Apr 22 2008 5:17 PM In reply to

    Re: 1080i Footage into a 24p Project?......

    Job is extremely right and your boss is really wrong. Put another way -- there is no way at all, based on the footage you have now, to maniulate any of the settings of i, p, 24, 25 or 30 or 60 or whatever to change the look of the  video.SO -- if you want to change the look you need to use some kind of special effects. If you tell this to your boss and he argues with you... have him call me. Bosses (I am one) can be quite annoying 

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    I think we need a few more digital HD formats

  • Thu, Apr 24 2008 10:15 AM In reply to

    • Roody
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    Re: 1080i Footage into a 24p Project?......

     Hi..

    Thanks for the additional advice... I think this series of replies has justified my point..

    Kindest Regards to all!!

    Roody

  • Thu, Apr 24 2008 1:43 PM In reply to

    • jwrl
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    Re: 1080i Footage into a 24p Project?......

    One way that you could do it is to import your 50i footage into After Effects.  Tell AE to interpret the footage as 24 frame, create a 24F composition and drop your footage into it.  Deinterlace and export the composion.  The end result will run slower and look slightly softer, but it will give you true 24p footage.

    But quite frankly I'm with the others.  Don't do it.

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