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Game recording/uploads

post #1 of 4
Thread Starter 
Ive been trying to find the best recording settings for youtube uploads and I have come accross something odd about youtube.

I thought there was no point recording gameplay at more than 30 fps as we all know youtube renders all uploads to 30fps. I have noticed however that when you record at 60 I think it still looks smoother which is strange given youtube still renders it at 30.

I have uploaded a video, I recorded the same clip at 1080p, one at recorded at 30fps and one at 60fps, can anyone else notice a difference or explain why?
post #2 of 4
It is very complicated but it involves mathematics and psychology.

The human eye sees in streams, not frames per second. This is mostly agreed to by everyone in the field, with a few outlying theories that slightly differ how the stream is perceived.

When we watch film. We are watching a stream of an infinite frames per second, of roughly a 27 frame per second motional picture.

This is called stream vs. source.

Something similar happens when we watch You tube video. Your eyes see an infinite FPS of 27 frames per second. This is only true however, if the FPS is consistently 27 FPS for every infinitely small passages of time. Computers do not generate such a thing. Neither do films. We don't have the technology to stream that.

So when you are recording at 30 FPS, there is a probability (since computers are not perfect) to dip to 28, or 25. Causing visual stutter that the human eye does actually detect, but not all brains are trained to perceive. Some of us are more capable than others. The higher the frame rate the better the transitioning of the image is, the less probability into dipping.

Well, you might ask, why does to 60 FPS look smoother? Its quite simple, most people forget there is a third layer involved. Video conversions are not a simple process at all, yet we do take for granted how easy they have become.

The Human Eye is the first layer, streaming an infinite frames per second. The second layer is the actual recorded footage, your 30 FPS or 60 FPS film and motion. Then there is the third layer, the uploaded Youtube video conversion that has taken place. There is actually a fourth layer, the video monitor's fresh rate, but for simplicity's sake, just pretend there are three. It is enough to show distortion exists. To what degree isn't necessary.

What happens in this third layer, is only a representation of the second layer. When perfectly synced to the right frequency and the right frame rate, there is usually no perceivable difference in the second and third layer. This is what you are actually watching described visually:
Code:
Human Vision:      ---------------------------------------------------------
Recorded Footage:  ---- ---- ---- ---- ---- ---- ---- ---- ---- ---- ---- ---- ---- (@ 30)
Converted Footage: --- --- --- --- --- --- --- --- --- --- --- --- --- --- --- --- --- (@ 27)

Human Vision:     -------------------------------------------------------------
Recorded Footage: -------- -------- -------- -------- -------- -------- -------- (@ 60)
Converted Footage:--- --- --- --- --- --- --- --- --- --- --- --- --- --- --- --- --- (@ 27)

It would obviously be better, if it was 54 fps, however comparing these two you can quickly tell there is a difference in footages, what may not be obvious is the translation of those differences to perception. Every gap represents the pocket of frames dropped from each group (in slight exaggeration.)

Its quite easy actually. The pool of frames in the second group (aka 60 fps) you can quickly see that the snapshots of the converted footage appear to overlap in sections of recorded footages more cleanly (overall) thus showing users the frame transitions that were in the original 60 fps, but "removed" from the 30 fps as dropped.

In the first sets of 30/27 footage, the first 3 groups of 27 fps exists over 3 different groups of 30 FPS.
In the second set, 60/27 footage, the first 3 groups of 27 fps exists over 2 different groups of 60 FPS. And barely 2.

Each group can be perceived as a scene. So while the frame rate is the same, you are being forced to watch 3 different scene transitional gaps vs. 2. With fewer gaps, the smoother the image. As is the description of Human vision would show you. You will have identical frame rate in both videos, its just the quality of those individual frames from the recorded footage though that determines how the converted footage turns out. Now take into the cap that the different frequency the converted footage has, now has frame drops in addition to groups above. It really all boils down to continuity of the images. A higher recorded video will essentially only have the gaps created in the converted footage. A lower recording, will incur gaps in the recorded frame captures and now add gaps from the converted film. Every gap that doesn't overlap, is an extra gap in the end product.
Edited by RagingCain - 8/25/13 at 9:44am
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Snowdevil
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post #3 of 4
Thread Starter 
Thanks for that concise answer but I think my brain has just been fried.....
post #4 of 4
Quote:
Originally Posted by tezza192 View Post

Thanks for that concise answer but I think my brain has just been fried.....
I tried to explain it as easy as possible.

I think I may have an analogy. If you have ever drawn an animation on posted notes or a notebook corner, where you have the next image on the next sheet?

Is it how fast you flip the pages or how many images that makes it seem smoothly animated?

YouTube equals the flipping motion and the recorded footage is your drawing.

If you flip at the same speed, (YouTube playback speed) but tear out half of the drawings (60 vs 30) you would see much less smoothness in the viewing.
Edited by RagingCain - 8/25/13 at 7:43pm
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