60fps to 25fps

General questions or discussion about HandBrake, Video and/or audio transcoding, trends etc.
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Ninko
Posts: 29
Joined: Sat Jul 27, 2019 11:34 pm

60fps to 25fps

Post by Ninko »

Hi,
I have some mp4 files that are 60fps. I wanted to reduce it down to 25fps, but when I play it back, it jumps every now and then, like it's missing a few frames every now and then.
So I tried converting down to 30fps, which seemed much better.

Could someone explain why there would be such a difference?

Thanks
mduell
Veteran User
Posts: 8187
Joined: Sat Apr 21, 2007 8:54 pm

Re: 60fps to 25fps

Post by mduell »

Divide 60 by 25.

Divide 60 by 30.
Ninko
Posts: 29
Joined: Sat Jul 27, 2019 11:34 pm

Re: 60fps to 25fps

Post by Ninko »

mduell wrote: Sun Sep 25, 2022 11:22 pm Divide 60 by 25.

Divide 60 by 30.
I'm aware of that thanks, but why does it matter?

Thanks
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JohnAStebbins
HandBrake Team
Posts: 5712
Joined: Sat Feb 09, 2008 7:21 pm

Re: 60fps to 25fps

Post by JohnAStebbins »

In order to convert 60 fps to 25 fps, every other input frame must be dropped for about 4 output frames, then on the 5th output frame an extra input frame needs to be dropped to compensate for the fractional quotient.
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