March 22, 2017 at 2:23PM

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A question about fps

Hey guys,

There is one thing about fps that confuses me. Is there any differences between a 25 fps footage and a 60 fps footage projected or exported 25 fps.

10 Comments

Yes. A typically very large difference is that 25 fps footage will shoot with a 1/50th second shutter speed, which is completely impossible at 60 fps. 60 fps footage is typically shot with 1/120th of a second shutter speed, which will look very "saving private ryan" when converted to play at 25 fps. Does that help clear up your confusion?

March 22, 2017 at 3:01PM

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Not much. 25 fps and 60 fps were just examples. I am wondering if there is a notable difference between a footage shot at a particular fps and a footage shot at a higher fps and viewed/exported (again if there is difference also between these two) at that particular fps. I mean if we just shot at the same shutter speed what will happen then?

Mete Ağar

March 22, 2017 at 3:39PM, Edited March 22, 3:39PM

Thank you for the answer, by the way.

Mete Ağar

March 22, 2017 at 3:40PM

I think there wouldn't be much of a difference, if you shoot at the same shutter. Maybe some quality loss if the Bitrate stays the same..

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March 22, 2017 at 7:51PM

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March 23, 2017 at 2:00AM

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Harry Smith
Seo
84

we usually shoot 60 fps when we want to show something in slow motion without getting blurry images and 25 fps is typical frame rate at which most people shoot. shutter speed also has to change according to frame rate or you may get bad footage which is either jarring or blurry.

March 23, 2017 at 3:56AM

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kishore rayudu
cinematographer
1

Mete, to answer what I suppose is the other question within your question: many consumer camcorders have a fixed bit rate of around 28Mbps. (Some, like the GH4, can shoot up to 200 Mbps.) Some also have higher color sampling rates at lower frame rates (4:2:2) than at lower frame rates (4:2:0). If you are wondering whether footage shot at 25fps and 1/50th of a second looks different than 50fps and 1/50th of a second, discarding every other frame, the answer is "it depends". It depends on whether your video scene is complex enough to break the quality of the codec being used to encode your video. If you shoot a simple scene, it might look find using 14 of the 28MBps it's encoding. If you shoot a scene with lots of detail and motion (leaves blowing in the wind is a typical example) the eye might be well-enough fooled when playing 50fps footage at 50fps, but it might see the breakdown of missing every other frame--and not having the compression bandwidth to give you better detail.

Higher-end codecs with better compression/more bandwidth will forestall these problems. And higher-end cameras, like RED, let you set how much compression you want (subject to their 300MB/sec maxima, which is 2400Mbps). Can one set a compression rate too high and get bad artifacts on a RED? Yes. Can one push a consumer camera over its limits by discarding half (or more) of the frames it shoots? Yes. But where, exactly are the limits? It is scene dependent and it is person-specific. Which is where experience comes in: learn your gear and your image workflow and you'll know where the limits are, just as you do with highlights, shadows, and everything else that literally makes or breaks your images/clips.

March 23, 2017 at 6:50AM

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Micheal, thank you for the answer, it was really useful and clarified the situation for me.

Mete Ağar

March 23, 2017 at 3:22PM

It does, as mentioned, due to shutter speed and its effects. Also, this is not something to look over so the choice must be motivated. 25fps or 50 fps, they both have their own "use" and that's the basic stuff for cinematography

March 23, 2017 at 7:41PM

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Mark Miller
Director
215

As folks mentioned, at 25fps your shutter is traditionally set to 1/50th of a second in order to mirror how film works. At 60fps, you actually have a choice-- there's no inherent need to shoot at 1/120th of a second. You can shoot at 1/60th of a second and it will look virtually the same as 25fps at 1/50th of a second footage. BUT! 60 isn't divisible by 25, so when you downsize your footage and output to 25fps, your software has to decide what to do with those extra frames, and the only thing it can do is drop them-- making the footage slightly jumpy. It doesn't destroy your footage but it is noticeable, which is why people usually commit to either 25fps or 30fps for the project at the start.

March 25, 2017 at 2:13AM

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Producer - Cinematographer
80

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April 15, 2017 at 2:43AM

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