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Creating a 24p blu-ray from a 24 FPS source: Is this the best option?

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Jeff Boller
Creating a 24p blu-ray from a 24 FPS source: Is this the best option?
on May 21, 2016 at 2:06:16 am
Last Edited By Jeff Boller on May 21, 2016 at 2:17:48 am

I'm creating a 24p blu-ray in Sony DVD Architect from a 24 FPS source and belatedly discovered that 24p doesn't mean 24 FPS -- it means 23.976 FPS. Whoops.

I refuse to use Sony Vegas's frameblending to convert the 24 FPS source material to 23.976, as I don't want that sort of look when watching a blu-ray.

I have Twixtor, which can be very good at converting frame rates with certain (but not all) kinds of material. However, I'd have to go through each shot and tweak them for the best conversion, as it will have weird morphing artifacts if it tries to convert over top of a cut. So I don't want to use that option either.

The only sane solution I can think of that would be visually true to the source material and wouldn't require Herculean efforts to convert would be to set up a 23.976 session in Sony Vegas, set the playback rate of the video to 0.999 while disabling resampling, extend the video to the new ending point, then use the time stretch at the highest quality to make the audio longer and match up with the new size of the video.

Is this the best option, or am I missing something?

Jeff Boller
http://www.sundriftproductions.com


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John Rofrano
Re: Creating a 24p blu-ray from a 24 FPS source: Is this the best option?
on May 22, 2016 at 2:36:51 pm

[Jeff Boller] "Is this the best option, or am I missing something?"
I would just disable resample and render to 23.976. The difference in time will never be noticed. It amounts to 1 second every 42 minutes.

~jr

http://www.johnrofrano.com
http://www.vasstsoftware.com



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Jeff Boller
Re: Creating a 24p blu-ray from a 24 FPS source: Is this the best option?
on May 22, 2016 at 3:37:41 pm

Just re-rendering a 24 FPS video to 23.976 gives me the occasional (visually unacceptable) frame blending artifact from Sony Vegas, which is how I originally realized 24p doesn't mean 24 FPS. I did the playback rate at .999 trick and stretched the audio appropriately as I described in my original post. I need to spend a little more time studying the results, but the change doesn't appear noticeable and there's no frame blending artifacts.

Jeff Boller
http://www.sundriftproductions.com


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John Rofrano
Re: Creating a 24p blu-ray from a 24 FPS source: Is this the best option?
on May 25, 2016 at 12:00:29 pm

If you disabled resample there would be no frame blending... it would just drop frames to match the rate needed.

~jr

http://www.johnrofrano.com
http://www.vasstsoftware.com



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Jeff Boller
Re: Creating a 24p blu-ray from a 24 FPS source: Is this the best option?
on May 26, 2016 at 2:02:52 am

Good idea. I will try this and see if I notice any jerky motion because of skipped frames.

Jeff Boller
http://www.sundriftproductions.com


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Jeff Boller
Re: Creating a 24p blu-ray from a 24 FPS source: Is this the best option?
on May 30, 2016 at 5:17:43 pm

FYI -- I tried rendering 24 FPS to 23.976 with no resampling. On a long smooth tracking shot, I could see a very obvious dropped frame. It looked terrible, so I went back to altering the video to play back at 23.976 so that no frames are dropped and stretched the audio to match the new duration.

Jeff Boller
http://www.sundriftproductions.com


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John Rofrano
Re: Creating a 24p blu-ray from a 24 FPS source: Is this the best option?
on May 30, 2016 at 8:49:05 pm

That will definitely fix the dropped frame problem. Hopefully next time you'll know to use 23.976 from the start. 24.0 fps is only for video captured from physical film or video being printed back out to film. All other references to 24p are really the video standard 23.976.

~jr

http://www.johnrofrano.com
http://www.vasstsoftware.com



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Jeff Boller
Re: Creating a 24p blu-ray from a 24 FPS source: Is this the best option?
on May 30, 2016 at 9:58:56 pm

Well, since I'm creating things that are played in theaters (film festivals)...24 FPS is where the projects start. I won't be changing that, as I don't believe DCPs have a 23.976 FPS option. (Even if they did, film festivals usually require 24 FPS DCPs, and I've had too many issues trying to get theaters to play 3D DCPs at non-24 FPS rates.)

Any idea on what the Hollywood studios generally do when converting their 24 FPS films onto blu-ray?

Jeff Boller
http://www.sundriftproductions.com


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John Rofrano
Re: Creating a 24p blu-ray from a 24 FPS source: Is this the best option?
on May 31, 2016 at 4:45:55 am

[Jeff Boller] "Any idea on what the Hollywood studios generally do when converting their 24 FPS films onto blu-ray?"
I believe they slow them down to 23.976 but many movies are shot digitally so they start out as 23.976.

~jr

http://www.johnrofrano.com
http://www.vasstsoftware.com



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