Bug? Can't set export frame rate?

Help/How To
1

Windows 10, Shotcut version 22.12.21

When I try to export the project to MP4 with frame rate 20 frames/sec,
the frame rate always jumps back to 249 frames/sec, which was the rate
originally used in first try of project (reworking accidental
slow-motion recording).

I was able to export the original 240 frames/sec clip to 20 frames/sec MP4.

I’ve attached the project.
Thanks!

PS: It seems the project setting is overriding the advance frame rate setting??
Without any indication in the UI as to what’s happening?

OSTIV_cleanup.mlt (5.8 KB)

2

Just curious… Is that a typo?

I don’t think the frame rate is expressed in Hertz (Hz). I always see in f/s or frame/second
The only value that I see in the Export tab that use Hz is the Audio Sample rate. But a sample rate of 20Hz or even 249Hz seams pretty low.

3

Apologies, frame rate. 249Hz was slow-motion, 60Hz is USA TV rate.
20Hz is to average slow motion and minimize the flicker of projected slides.
Corrected the question…

4

Technically hertz is also good enough to use instead of fps, altough it’s usually referring to a physical object, something like this TV can do 60Hz, monitor 144hz etc. I don’t think it’s a mistake strictly from the definition:

The hertz (symbol: Hz) is the unit of frequency in the International System of Units (SI), equivalent to one event (or cycle) per second.

1 Like
5

There’s a 3x limit to how smaller than video mode you can export the project, so at 240fps the limit is 240/3 = 80fps. To overcome this you can set the poject’s video mode to something smaller (like 60 fps, or just straight to 24) and then you’ll be able to export this.

I also had the same problem a while back but as long as there’s a workaround I was fine with it but I still disagree with the limit.

6

Worst is the UI bug: don’t allow the user to change the frame rate, then immediately reset it without explanation. Next, why are the project settings limited? I ended up completing the export at 24Hz (after changing the project settings, just because it was the closest available option)…
Thanks!

7

Settings > Video Mode > Custom
Or, select Timeline > Output and then click Edit in Properties

A 240 fps video is usually intended to be used for slow motion in a 60 fps or lower project. You can only achieve that by - in addition to some speed effect - changing the project Video Mode and not by Export > Advanced (that button should caution you).

8

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