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How to convert true 24 fps video/audio for DVD?

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Michael RavitzHow to convert true 24 fps video/audio for DVD?
by on May 24, 2016 at 5:21:11 am

I have a short film (aprox. 20 min) tiff sequence (1920x1080, with letterbox 2.39:1) at true 24 fps (not 23.976) and a matching audio wav file also at true 24 fps... of which look and Sound great on DCP and Blu-ray...

How do I convert these assets to author a NTSC DVD (that'll only accept 23.976+pulldown or straight 29.97) without stutter, skiped frames, audio sync issues, etc.? I am currently using the Adobe CS6 suite (Premiere Pro, AE, Encore, etc.) and have scoured the internet for a simple answer to no avail.

How does Hollywood do this, as it is done all the time to create commercial DVDs from movies shot on actual film at true 24 fps?

Thanks for the help!


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Dave LaRondeRe: How to convert true 24 fps video/audio for DVD?
by on May 24, 2016 at 3:04:08 pm
Last Edited By Dave LaRonde on May 24, 2016 at 4:31:54 pm

There are VERY rare times when AE's handy with audio. This just may be one of those times.

Since DVD's are always standard definition, we can save some. AE render time by working in SD.

Import the 24 fps sequence into AE. Highlight it. Go File>Interpret>Main. Change the frame rate to 23.976. Drop the interpreted file onto the Make Comp icon at the bottom of the project window.
I'll assume this 2.35:1 file is actually 16x9 with letterboxing.
In the comp settings, change the resolution to 864x486 -- this is 16x9 SD in square pixels. Highlight the layer in the comp and scale the layer to fit the comp: ctl-alt-f Win, cmd-opt-f Mac.

Now we're ready for audio.

Add the wav file to the comp. It will be a bit shorter than the video layer. Enable Time Remapping on the audio. move both the rightmost time remapping keyframe AND the audio layer out point to the end of the comp.

Now you're ready to render out a high-quality video file with its audio track. You can then use it to make the mpeg2/ac3 files for DVD authoring.

NOTE: Your audio will drop slightly in pitch. The motion will be a tiny, tiny bit slower. Its duration will be a tiny bit longer than the original. Plus, the image quality of a DVD won't be nearly as good as your original. You're going from HD to SD, and you're compressing the bejeezus out of it by going to the ONLY kind of file used in an authored DVD, mpeg2. You can't expect miracles.

As for the pitch change and the slower motion, you could always take your original files to a post house and hire the whole thing done to make the length precisely match the original, with no pitch-shifting. That's how the guys in Hollywood would do it. For just 20 minutes, it should only be a couple-three thousand bucks.

Another option -- get Twixtor and do a frame rate conversion if the length of the video must precisely match the original video. Twixtor runs about 600 bucks. The original audio shouldn't need anything. Cripes, it's an audio file, and they don't naturally have a frame rate. If this one does, make your software ignore it.

Dave LaRonde
Promotion Producer
KGAN (CBS) & KFXA (Fox) Cedar Rapids, IA


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