If you get smoother playback in the Edit module, you can use that Mode.

Depending on your country TV Mode the Create Disk module will render the videos on the timeline to fit your Country TV mode (PAL or NTSC).

You can pre-produce the project to a Mpeg2 HQ video that matches your Country's TV mode and see if the Video plays OK.
If the Video looks good you can use that video on the timeline to create your DVD.

If you were making Bluray Disks, you can use 24 fps, as that is one of the allowed formats.
Carl312: Windows 10 64-bit 8 GB RAM,AMD Phenom II X4 965 3.4 GHz,ATI Radeon HD 5770 1GB,240GB SSD,two 1TB HDs.

Always make sure your project settings are the same as your clips, otherwise you may get unsmooth result.

In your case, I will choose 24FPS. ------------------------------------------------------------------------------------------------
PowerDirector 365

As you have found and others have mentioned any Frame Rate mismatch will result in jerky playback....and there is little you can do. I'd too would start with what distribution format you need to use (eg PAL DVD, BD etc) and that will set the choice you have for frame rates. Eg if you need a PAL DVD then you will be running in multiples of 25 so your 23.976 will be jerky. If you plan to use a BD you could pick either 23.976p or 50i and one of the sources will be smooth and the other jerky. NTSC will be jerky for both (though 23.976 --> 30/60i looks "normal" for most NTSC users).

There is another option but it also has drawbacks. You can change the playback speed of one or both clips to match the output fps. Eg you could "slow down" the 25fps pal material to 23.976 but it will result in the PAL material running longer/slower by 4%. This change in speed may not be too noticeable on the video but it will also have a half octave lowering of the pitch of any audio (everything will sound deeper). You could optionally then change the pitch back up but this can then introduce other audio artifacts.

No good answer exists. PD 64 Bit-Win10 64 Bit-32GB RAM-80TB HDD
Sony FX6 - 500Mbps 4k/50p AVC-I HLG
Canon XF400 - 150Mbps 4k/50p AVC
GoPro Hero6 Black
Pana HS700-28Mbps 1080/50p AVC (High@L4.2)
Canon HV20-HDV 25Mbps 16:9 1440x1080/25p MPEG

Thanks King and jmone,

This is the kind of suggestions that I needed. I'll try with the 24 film (NTSC) as that favors my video clips versus my friends clips. I have to better understand how these choices affect the outcome as it creates the HQ DVD that I normally burn.

I got the impression that this choice just affects playback in PD12, not the final DVD burn. Perhaps it's both. This degrades my excitement in using the new multicamera feature introduced in PD12. In my case, I don't have control over what cameras others use and give me for the next project. I see it is all a compromise. And I'm not that much of a profectionist to fiddle with changing the speed of one video type versus the other. I'm working on a 10-DVD project for our Alaska trip. That means literally hundreds of video clips to fiddle with along with about 6000 still photos with transitions, pans and zooms in stitched photos. This will already take me 6 months to complete without this extra work of matching video frame rates. I'll have to live with the jerky result, but now I'll know why it is happening. The seniors at the senior centers may not even notice.

Bill Bill Seifert
HP Pavilion Desktop TP01-2022
8 core
AMD Radeon
Windows 11, 16 GB RAM

No probs, since you are in an NTSC country I'd suggest using 60i settings on your camcorder if you want to produce NTSC DVD's and just live with the judder on if you have to include footage from devices where the frame rate differs. Most people will not notice. Chasing "perfection" will eat more time that that used to watch them! PD 64 Bit-Win10 64 Bit-32GB RAM-80TB HDD
Sony FX6 - 500Mbps 4k/50p AVC-I HLG
Canon XF400 - 150Mbps 4k/50p AVC
GoPro Hero6 Black
Pana HS700-28Mbps 1080/50p AVC (High@L4.2)
Canon HV20-HDV 25Mbps 16:9 1440x1080/25p MPEG

Hi Bill,

You might also take into consideration that not all video clips are identical in this regards. A brick wall shot at 59.97, 24.94, 24 or 15 fps and then up or down converted to any of those really doesn't show much change. :

On the other hand a fast moving, crossing object will definitely show the problem, as will panning shots. So it might be worth treating the worst offenders in some way (or even leaving them out unless crucial) but leaving the rest as "averages" and live with the resulting slight problem but with no major judders??

Cheers
Adrian Life is really simple, but we insist on making it complicated. (see below)
Confucius
AMD Phenom IIX6 1055T, win10, 5 internal drives, 7 usb drives, struggling power supply.

I frequently use 24 fps sources but end up rendering to 30 fps. I've yet to encounter any issues.

Going the other way ? Yes. There will be issues with objects in motion. Win 10, i7