Name: 2019年數字媒體探索--第4講--視頻製作基本功 (Exploring Digital Media 2019 - Lecture 4 - Basic Video Production)
Uploaded: 2021-01-14T10:19:45.000Z
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Hello, and welcome back to another week of exploring digital media.

This week we're going to talk about the basics of video production.

We have wrapped up our still photography component which has been a lot of fun.

It's been really fun to see what you guys have done.

And so now we move into the world of video,

where we're talking about more than just one frame at a time.

So speaking of which, as I said, we've been focused on one frame.

But now our camera is literally capturing at high speed

So there's a lot more that we have to think about as we do this.

So we refer to how many times we see an image per second

Like, you go see a movie in the theater, what

IAN SEXTON: We'll see 24 frames per second.

And certainly this graphic shows 60 FPS, 60 frames per second.

That's kind of some of what we're going to unpack a little bit tonight.

How many frames per second is that shown at?

So it goes back to some old standards, but 60 frames per second

And that doesn't mean that the content that you're viewing

was recorded at 60 frames per second necessarily.

But it has been conformed to 60 frames per second as you watch it back.

So as far as frame rate goes, this all kind of comes down to human perception.

And how do we determine that 24 frames per second is the--

how did that become the standard for film making?

So let's look at a couple of clips here, starting

with just three frames per second, as you see on the top right corner.

Let's watch this and see how this little clip feels.

And to be clear, this is a video that was shot at a higher frame rate

and has been conformed to three frames per second.

You're noticing every single frame rather than watching

We're kind of still seeing quite a bit of judder,

as we refer to as a frame rate that is very low and kind of clunky like that.

Let's move ahead to 12 frames per second.

Is that starting to feel a bit more like a natural motion?

Let's go to 24 frames per second, as we've already discussed

And so this kind of comes down to what it is that we're looking at.

We're looking at a group of pictures in a rapid succession.

It's encoded a bit more smartly than that, but at the end of the day,

you're really just looking at pictures being--

it's like a flip book you open and flip through very quickly,

So 24 frames per second has kind of become the standard.

Does anybody know the reasoning for why that was initially the standard back--

I don't even know the year that it was established.

IAN SEXTON: I actually don't know off the top of my head either.

But 12 frames per second is kind of where

we start to not be able to distinguish the difference between the still images

But 24 frames per second is the standard.

AUDIENCE: I was just saying, to save money for 24 frames--

So on this film strip here, we had 24 frames per second.

I'm sorry, where you have your film, you've

got your picture encoded alongside your audio.

So the audio track actually ran alongside the picture.

film is not cheap, so we wanted to find a way to use as little as possible.

But we also needed to have enough fidelity in the audio

that it sounded nice and clear and sharp and was not too muddy

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2019年數字媒體探索--第4講--視頻製作基本功 (Exploring Digital Media 2019 - Lecture 4 - Basic Video Production)

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