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TOPIC: Burn 29.97fps to 25fps dvd - the picture is jerky...

Burn 29.97fps to 25fps dvd - the picture is jerky... 20 Sep 2019 16:12 #101532

  • vinckles
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When I burn 29.97fps, using the Freemake Video Converter, to 25fps DVD, the result is a slightly "jerky" picture quality. Can I treat the 29.97 video in any way to make it smoother? What kind of result am I likely to get if I burn 23.98fps to 25fps DVD, please? I have not tried this yet...I am hoping someone can tell me in advance.
Thank you.
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Burn 29.97fps to 25fps dvd - the picture is jerky... 21 Sep 2019 11:58 #101546

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Compressor would probably do a better job. But yes, "fake frames" have to be created from scratch to fill in time. 23.98 to 25 needs fewer of them, and yes, would probably give a better result.
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Burn 29.97fps to 25fps dvd - the picture is jerky... 21 Sep 2019 13:26 #101548

  • joema
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vinckles wrote:
When I burn 29.97fps, using the Freemake Video Converter, to 25fps DVD, the result is a slightly "jerky" picture quality. Can I treat the 29.97 video in any way to make it smoother?....

Put the 29.97 material into a 25 fps timeline, select all clips in timeline with CMD+A, then when finished, in video inspector at right scroll to bottom and under Rate Conform>Frame Sampling, pick "Optical Flow". Make sure all clips in timeline are selected and render them with CTRL+R, then examine for motion smoothness. If it's OK, export to a file format compatible with your DVD authoring software. Or if you are burning from FCPX, try directly from there.

The problem is there is no perfect way to rate conform non-multiple frame rates. 30 and 60 can be perfectly rate conformed, 24 and 48, etc. With interlaced TV they can convert 24 to 29.97i using 3:2 pulldown which is a poor-man's version of frame blending. For two progressive sources such as 29.97p and 25p, it's more difficult. Nowadays we have optical flow methods but the cost in CPU and rendering time can be significant. The lesson is (where possible) shoot in the frame rate planned for final distribution.
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Burn 29.97fps to 25fps dvd - the picture is jerky... 21 Sep 2019 13:41 #101550

  • Axel
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I see that when you have a single vob of NTSC video for an otherwise PAL DVD, you want to make it fit. On the other hand, as long as they don’t have region code, all NTSC DVDs will run perfectly on PAL players ...
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Burn 29.97fps to 25fps dvd - the picture is jerky... 22 Sep 2019 13:09 #101568

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Special thank you to all who have written: I can proceed with more confidence now.
Regards, Vinckles.
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